Class: ActiveRecord::ConnectionAdapters::IBM_DBAdapter

Inherits:
AbstractAdapter
  • Object
show all
Includes:
QueryCache, Savepoints
Defined in:
lib/active_record/connection_adapters/ibm_db_adapter.rb,
lib/active_record/connection_adapters/ibm_db_pstmt.rb

Overview

The IBM_DB Adapter requires the native Ruby driver (ibm_db) for IBM data servers (ibm_db.so). config the hash passed as an initializer argument content:

mandatory parameters

adapter:         'ibm_db'        // IBM_DB Adapter name
username:        'db2user'       // data server (database) user
password:        'secret'        // data server (database) password
database:        'ARUNIT'        // remote database name (or catalog entry alias)

optional (highly recommended for data server auditing and monitoring purposes)

schema:          'rails123'      // name space qualifier
account:         'tester'        // OS account (client workstation)
app_user:        'test11'        // authenticated application user
application:     'rtests'        // application name
workstation:     'plato'         // client workstation name

remote TCP/IP connection (required when no local database catalog entry available)

host:            'socrates'      // fully qualified hostname or IP address
port:            '50000'         // data server TCP/IP port number
security:        'SSL'           // optional parameter enabling SSL encryption -
                                 // - Available only from CLI version V95fp2 and above
authentication:  'SERVER'        // AUTHENTICATION type which the client uses -
                                 // - to connect to the database server. By default value is SERVER
timeout:         10              // Specifies the time in seconds (0 - 32767) to wait for a reply from server -
                                 //- when trying to establish a connection before generating a timeout

Parameterized Queries Support

parameterized:  false            // Specifies if the prepared statement support of
                                 //- the IBM_DB Adapter is to be turned on or off

When schema is not specified, the username value is used instead. The default setting of parameterized is false.

Defined Under Namespace

Classes: AlterTable, Column, SchemaDumper, StatementPool, TableDefinition, UniqueConstraintDefinition

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from QueryCache

included, #prepared_select_with_query_cache

Constructor Details

#initialize(args) ⇒ IBM_DBAdapter

Returns a new instance of IBM_DBAdapter.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 793

def initialize(args)
  # Caching database connection configuration (+connect+ or +reconnect+ support)\
  connection, ar3, config, conn_options = ActiveRecord::Base.ibm_db_connection(args)
  @config = config
  @connection = connection
  @isAr3 = ar3
  @conn_options     = conn_options
  @database         = config[:database]
  @username         = config[:username]
  @password         = config[:password]
  @debug            = config[:debug]
  if config.has_key?(:host)
    @host           = config[:host]
    @port           = config[:port] || 50000 # default port
  end
  @schema = if config.has_key?(:schema)
              config[:schema]
            else
              config[:username]
            end
  @security         = config[:security] || nil
  @authentication   = config[:authentication] || nil
  @timeout          = config[:timeout] || 0 # default timeout value is 0

  @app_user = @account = @application = @workstation = nil
  # Caching database connection options (auditing and billing support)
  @app_user         = conn_options[:app_user]     if conn_options.has_key?(:app_user)
  @account          = conn_options[:account]      if conn_options.has_key?(:account)
  @application      = conn_options[:application]  if conn_options.has_key?(:application)
  @workstation      = conn_options[:workstation]  if conn_options.has_key?(:workstation)

  @sql                  = []
  @sql_parameter_values = [] # Used only if pstmt support is turned on

  @handle_lobs_triggered = false

  # Calls the parent class +ConnectionAdapters+' initializer
  super(@config)

  if @connection
    server_info = IBM_DB.server_info(@connection)
    if server_info
      case server_info.DBMS_NAME
      when %r{DB2/}i # DB2 for Linux, Unix and Windows (LUW)
        @servertype = case server_info.DBMS_VER
                      when /09.07/i # DB2 Version 9.7 (Cobra)
                        IBM_DB2_LUW_COBRA.new(self, @isAr3)
                      when /10./i # DB2 version 10.1 and above
                        IBM_DB2_LUW_COBRA.new(self, @isAr3)
                      else # DB2 Version 9.5 or below
                        IBM_DB2_LUW.new(self, @isAr3)
                      end
      when /DB2/i # DB2 for zOS
        case server_info.DBMS_VER
        when /09/             # DB2 for zOS version 9 and version 10
          @servertype = IBM_DB2_ZOS.new(self, @isAr3)
        when /10/
          @servertype = IBM_DB2_ZOS.new(self, @isAr3)
        when /11/
          @servertype = IBM_DB2_ZOS.new(self, @isAr3)
        when /12/
          @servertype = IBM_DB2_ZOS.new(self, @isAr3)
        when /08/             # DB2 for zOS version 8
          @servertype = IBM_DB2_ZOS_8.new(self, @isAr3)
        else # DB2 for zOS version 7
          raise 'Only DB2 z/OS version 8 and above are currently supported'
        end
      when /AS/i                # DB2 for i5 (iSeries)
        @servertype = IBM_DB2_I5.new(self, @isAr3)
      when /IDS/i               # Informix Dynamic Server
        @servertype = IBM_IDS.new(self, @isAr3)
      else
        log('server_info',
            'Forcing servertype to LUW: DBMS name could not be retrieved. Check if your client version is of the right level')
        warn 'Forcing servertype to LUW: DBMS name could not be retrieved. Check if your client version is of the right level'
        @servertype = IBM_DB2_LUW.new(self, @isAr3)
      end
      @database_version = server_info.DBMS_VER
    else
      error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
      IBM_DB.close(@connection)
      raise "Cannot retrieve server information: #{error_msg}"
    end
  end

  # Executes the +set schema+ statement using the schema identifier provided
  @servertype.set_schema(@schema) if @schema && @schema != @username

  # Check for the start value for id (primary key column). By default it is 1
  @start_id = if config.has_key?(:start_id)
                config[:start_id]
              else
                1
              end

  # Check Arel version
  begin
    @arelVersion = Arel::VERSION.to_i
  rescue StandardError
    @arelVersion = 0
  end

  @visitor = Arel::Visitors::IBM_DB.new self if @arelVersion >= 3

  if config.has_key?(:parameterized) && config[:parameterized] == true
    @pstmt_support_on = true
    @prepared_statements = true
    @set_quoted_literal_replacement = IBM_DB::QUOTED_LITERAL_REPLACEMENT_OFF
  else
    @pstmt_support_on = false
    @prepared_statements = false
    @set_quoted_literal_replacement = IBM_DB::QUOTED_LITERAL_REPLACEMENT_ON
  end
end

Instance Attribute Details

#account ⇒ Object

Returns the value of attribute account.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def 
  @account
end

#app_user ⇒ Object

Returns the value of attribute app_user.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def app_user
  @app_user
end

#application ⇒ Object

Returns the value of attribute application.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def application
  @application
end

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def connection
  @connection
end

#handle_lobs_triggered ⇒ Object

Returns the value of attribute handle_lobs_triggered.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 660

def handle_lobs_triggered
  @handle_lobs_triggered
end

#pstmt_support_on ⇒ Object (readonly)

Returns the value of attribute pstmt_support_on.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def pstmt_support_on
  @pstmt_support_on
end

#schema ⇒ Object

Returns the value of attribute schema.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def schema
  @schema
end

#servertype ⇒ Object (readonly)

Returns the value of attribute servertype.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def servertype
  @servertype
end

#set_quoted_literal_replacement ⇒ Object (readonly)

Returns the value of attribute set_quoted_literal_replacement.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def set_quoted_literal_replacement
  @set_quoted_literal_replacement
end

#sql ⇒ Object

Returns the value of attribute sql.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 660

def sql
  @sql
end

#sql_parameter_values ⇒ Object

Returns the value of attribute sql_parameter_values.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 660

def sql_parameter_values
  @sql_parameter_values
end

#workstation ⇒ Object

Returns the value of attribute workstation.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 658

def workstation
  @workstation
end

Class Method Details

.visitor_for(pool) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 977

def self.visitor_for(pool)
  puts_log 'visitor_for'
  Arel::Visitors::IBM_DB.new(pool)
end

Instance Method Details

#active? ⇒ Boolean

Tests the connection status

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1093

def active?
  isActive = false
  puts_log "active? #{caller} #{Thread.current}"
  @lock.synchronize do
    puts_log "active? #{@connection}, #{caller}, #{Thread.current}"
    isActive = IBM_DB.active @connection
    puts_log "active? isActive = #{isActive}"
  end
  isActive
rescue StandardError => e
  puts_log "active? check failure #{e.message}, #{caller}, #{Thread.current}"
  false
end

#adapter_name ⇒ Object

Name of the adapter



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 663

def adapter_name
  'IBM_DB'
end

#add_column(table_name, column_name, type, **options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2958

def add_column(table_name, column_name, type, **options) # :nodoc:
  puts_log 'add_column'
  clear_cache!
  puts_log "add_column info #{table_name}, #{column_name}, #{type}, #{options}"
  puts_log caller
  if (!type.nil? && type.to_s == 'primary_key') or (options.key?(:primary_key) and options[:primary_key] == true)
    if !type.nil? and type.to_s != 'primary_key'
      execute "ALTER TABLE #{table_name} ADD COLUMN #{column_name} #{type} NOT NULL DEFAULT 0"
    else
      execute "ALTER TABLE #{table_name} ADD COLUMN #{column_name} INTEGER NOT NULL DEFAULT 0"
    end
    execute "ALTER TABLE #{table_name} alter column #{column_name} drop default"
    execute "ALTER TABLE #{table_name} alter column #{column_name} set GENERATED BY DEFAULT AS IDENTITY (START WITH 1000)"
    execute "ALTER TABLE #{table_name} add primary key (#{column_name})"
  else
    super
  end
  change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
end

#add_foreign_keyList(fkey_list, table_name, column_name, new_column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3222

def add_foreign_keyList(fkey_list, table_name, column_name, new_column_name)
  puts_log "add_foreign_keyList = #{table_name}, #{column_name}, #{fkey_list}"
  fkey_list.each do |fkey|
    if fkey.options[:column] == column_name
      add_foreign_key(table_name, strip_table_name_prefix_and_suffix(fkey.to_table), column: new_column_name)
    end
  end
end

#add_index(table_name, column_name, **options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2984

def add_index(table_name, column_name, **options) # :nodoc:
  puts_log 'add_index'
  index, algorithm, if_not_exists = add_index_options(table_name, column_name, **options)

  return if if_not_exists && index_exists?(table_name, column_name, name: index.name)

  if_not_exists = false if if_not_exists
  create_index = CreateIndexDefinition.new(index, algorithm, if_not_exists)
  result = execute schema_creation.accept(create_index)

  execute "COMMENT ON INDEX #{quote_column_name(index.name)} IS #{quote(index.comment)}" if index.comment
  result
end

#add_reference(table_name, ref_name, **options) ⇒ Object Also known as: add_belongs_to

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3123

def add_reference(table_name, ref_name, **options) # :nodoc:
  puts_log "add_reference table_name = #{table_name}, ref_name = #{ref_name}"
  super(table_name, ref_name, type: :integer, **options)
end

#add_timestamps(table_name, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2998

def add_timestamps(table_name, **options)
  puts_log "add_timestamps #{table_name}"
  fragments = add_timestamps_for_alter(table_name, **options)
  execute "ALTER TABLE #{quote_table_name(table_name)} #{fragments.join(' ')}"
end

#add_unique_constraint(table_name, column_name = nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3370

def add_unique_constraint(table_name, column_name = nil, **options)
  puts_log "add_unique_constraint = #{table_name}, #{column_name}, #{options}"
  options = unique_constraint_options(table_name, column_name, options)
  at = create_alter_table(table_name)
  at.add_unique_constraint(column_name, options)

  execute schema_creation.accept(at)
end

#add_unique_constraint_byColumn(unique_indexes, new_column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3208

def add_unique_constraint_byColumn(unique_indexes, new_column_name)
  puts_log "add_unique_constraint_byColumn = #{unique_indexes}"
  unique_indexes.each do |unq|
    add_unique_constraint(unq.table_name, new_column_name, name: unq.name)
  end
end

#alter_foreign_keys(tables, not_enforced) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2915

def alter_foreign_keys(tables, not_enforced)
  puts_log 'alter_foreign_keys'
  enforced = not_enforced ? 'NOT ENFORCED' : 'ENFORCED'
  tables.each do |table|
    foreign_keys(table).each do |fk|
      puts_log "alter_foreign_keys fk = #{fk}"
      execute("ALTER TABLE #{@servertype.set_case(fk.from_table)} ALTER FOREIGN KEY #{@servertype.set_case(fk.name)} #{enforced}")
    end
  end
end

#assert_valid_deferrable(deferrable) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3525

def assert_valid_deferrable(deferrable)
  return if !deferrable || %i(immediate deferred).include?(deferrable)

  raise ArgumentError, "deferrable must be `:immediate` or `:deferred`, got: `#{deferrable.inspect}`"
end

#auto_commit_off ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1949

def auto_commit_off
  puts_log 'auto_commit_off'
  IBM_DB.autocommit(@connection, IBM_DB::SQL_AUTOCOMMIT_OFF)
  ac = IBM_DB::autocommit @connection
  if ac != 0
    puts_log "Cannot set IBM_DB::AUTOCOMMIT_OFF"
  else
    puts_log "AUTOCOMMIT_OFF set"
  end
end

#auto_commit_on ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1938

def auto_commit_on
  puts_log 'Inside auto_commit_on'
  IBM_DB.autocommit @connection, IBM_DB::SQL_AUTOCOMMIT_ON
  ac = IBM_DB::autocommit @connection
  if ac != 1
    puts_log "Cannot set IBM_DB::AUTOCOMMIT_ON"
  else
    puts_log "AUTOCOMMIT_ON set"
  end
end

#begin_db_transaction ⇒ Object

Begins the transaction (and turns off auto-committing)



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1961

def begin_db_transaction
  puts_log 'begin_db_transaction'
  log('begin transaction', 'TRANSACTION') do
    with_raw_connection(allow_retry: true, materialize_transactions: false) do |conn|
      # Turns off the auto-commit
      auto_commit_off
      verified!
    end
  end
end

#bind_params_length ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 920

def bind_params_length
  999
end

#build_change_column_default_definition(table_name, column_name, default_or_changes) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3307

def build_change_column_default_definition(table_name, column_name, default_or_changes) # :nodoc:
  column = column_for(table_name, column_name)
  return unless column

  default = extract_new_default_value(default_or_changes)
  ChangeColumnDefaultDefinition.new(column, default)
end

#build_change_column_definition(table_name, column_name, type, **options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3315

def build_change_column_definition(table_name, column_name, type, **options) # :nodoc:
  column = column_for(table_name, column_name)
  type ||= column.sql_type

  unless options.key?(:default)
    options[:default] = column.default
  end

  unless options.key?(:null)
    options[:null] = column.null
  end

  unless options.key?(:comment)
    options[:comment] = column.comment
  end

  if options[:collation] == :no_collation
    options.delete(:collation)
  else
    options[:collation] ||= column.collation if text_type?(type)
  end

  unless options.key?(:auto_increment)
    options[:auto_increment] = column.auto_increment?
  end

  td = create_table_definition(table_name)
  cd = td.new_column_definition(column.name, type, **options)
  ChangeColumnDefinition.new(cd, column.name)
end

#build_conn_str_for_dbops ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2133

def build_conn_str_for_dbops
  puts_log 'build_conn_str_for_dbops'
  connect_str = 'DRIVER={IBM DB2 ODBC DRIVER};ATTACH=true;'
  unless @host.nil?
    connect_str << "HOSTNAME=#{@host};"
    connect_str << "PORT=#{@port};"
    connect_str << 'PROTOCOL=TCPIP;'
  end
  connect_str << "UID=#{@username};PWD=#{@password};"
  connect_str
end

#build_fixture_sql(fixtures, table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1378

def build_fixture_sql(fixtures, table_name)
  columns = schema_cache.columns_hash(table_name).reject { |_, column| supports_virtual_columns? && column.virtual? }
  puts_log "build_fixture_sql - Table = #{table_name}"
  puts_log "build_fixture_sql - Fixtures = #{fixtures}"
  puts_log "build_fixture_sql - Columns = #{columns}"

  values_list = fixtures.map do |fixture|
    fixture = fixture.stringify_keys
    fixture = fixture.transform_keys(&:downcase)

    unknown_columns = fixture.keys - columns.keys
    if unknown_columns.any?
      raise Fixture::FixtureError, %(table "#{table_name}" has no columns named #{unknown_columns.map(&:inspect).join(', ')}.)
    end

    columns.map do |name, column|
      if fixture.key?(name)
        type = lookup_cast_type_from_column(column)
        with_yaml_fallback(type.serialize(fixture[name]))
      else
        default_insert_value(column)
      end
    end
  end

  table = Arel::Table.new(table_name)
  manager = Arel::InsertManager.new(table)

  if values_list.size == 1
    values = values_list.shift
    new_values = []
    columns.each_key.with_index { |column, i|
      unless values[i].equal?(DEFAULT_INSERT_VALUE)
        new_values << values[i]
        manager.columns << table[column]
      end
    }
    values_list << new_values
  else
    columns.each_key { |column| manager.columns << table[column] }
  end

  manager.values = manager.create_values_list(values_list)
  visitor.compile(manager.ast)
end

#build_fixture_statements(fixture_set) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1424

def build_fixture_statements(fixture_set)
  puts_log "build_fixture_statements - fixture_set = #{fixture_set}"
  fixture_set.filter_map do |table_name, fixtures|
    next if fixtures.empty?
    build_fixture_sql(fixtures, table_name)
  end
end

#build_insert_sql(insert) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1601

def build_insert_sql(insert) # :nodoc:
  sql = +"INSERT #{insert.into} #{insert.values_list}"
  sql
end

#build_statement_pool ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 789

def build_statement_pool
  StatementPool.new(self.class.type_cast_config_to_integer(@config[:statement_limit]))
end

#build_truncate_statement(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1373

def build_truncate_statement(table_name)
  puts_log 'build_truncate_statement'
  "DELETE FROM #{quote_table_name(table_name)}"
end

#change_column(table_name, column_name, type, options = {}) ⇒ Object

Changes the column’s definition according to the new options. See TableDefinition#column for details of the options you can use.

Examples
change_column(:suppliers, :name, :string, :limit => 80)
change_column(:accounts, :description, :text)



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3272

def change_column(table_name, column_name, type, options = {})
  puts_log 'change_column'
  @servertype.change_column(table_name, column_name, type, options)
  change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
end

#change_column_comment(table_name, column_name, comment_or_changes) ⇒ Object

Adds comment for given table column or drops it if comment is a nil



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2934

def change_column_comment(table_name, column_name, comment_or_changes) # :nodoc:
  puts_log 'change_column_comment'
  clear_cache!
  comment = extract_new_comment_value(comment_or_changes)
  if comment.nil?
    execute "COMMENT ON COLUMN #{quote_table_name(table_name)}.#{quote_column_name(column_name)} IS ''"
  else
    execute "COMMENT ON COLUMN #{quote_table_name(table_name)}.#{quote_column_name(column_name)} IS #{quote(comment)}"
  end
end

#change_column_default(table_name, column_name, default) ⇒ Object

Sets a new default value for a column. This does not set the default value to NULL, instead, it needs DatabaseStatements#execute which can execute the appropriate SQL statement for setting the value.

Examples

change_column_default(:suppliers, :qualification, 'new')
change_column_default(:accounts, :authorized, 1)

Method overriden to satisfy IBM data servers syntax.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3295

def change_column_default(table_name, column_name, default)
  puts_log 'change_column_default'
  @servertype.change_column_default(table_name, column_name, default)
end

#change_column_null(table_name, column_name, null, default = nil) ⇒ Object

Changes the nullability value of a column



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3301

def change_column_null(table_name, column_name, null, default = nil)
  puts_log 'change_column_null'
   validate_change_column_null_argument!(null)
  @servertype.change_column_null(table_name, column_name, null, default)
end

#change_table_comment(table_name, comment_or_changes) ⇒ Object

Adds comment for given table or drops it if comment is a nil



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2946

def change_table_comment(table_name, comment_or_changes) # :nodoc:
  puts_log "change_table_comment table_name = #{table_name}, comment_or_changes = #{comment_or_changes}"
  clear_cache!
  comment = extract_new_comment_value(comment_or_changes)
  puts_log "change_table_comment new_comment = #{comment}"
  if comment.nil?
    execute "COMMENT ON TABLE #{quote_table_name(table_name)} IS ''"
  else
    execute "COMMENT ON TABLE #{quote_table_name(table_name)} IS #{quote(comment)}"
  end
end

#check_if_write_query(sql) ⇒ Object

For rails 7.1 just remove this function as it will be defined in AbstractAdapter class

Raises:

  • (ActiveRecord::ReadOnlyError) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1799

def check_if_write_query(sql) # For rails 7.1 just remove this function as it will be defined in AbstractAdapter class
  return unless preventing_writes? && write_query?(sql)

  raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
end

#close ⇒ Object

Check the connection back in to the connection pool



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1203

def close
  pool.checkin self
  disconnect!
end

#column_for(table_name, column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3538

def column_for(table_name, column_name)
  super
end

#columns(table_name) ⇒ Object

Returns an array of Column objects for the table specified by table_name



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2649

def columns(table_name)
  default_blob_length = 1048576
  # to_s required because it may be a symbol.
  puts_log "def columns #{table_name}"
  puts_log caller
  table_name = @servertype.set_case(table_name.to_s)

  # Checks if a blank table name has been given.
  # If so it returns an empty array
  return [] if table_name.strip.empty?

  # +columns+ will contain the resulting array
  columns = []
  # Statement required to access all the columns information
  stmt = IBM_DB.columns(@connection, nil,
                        @servertype.set_case(@schema),
                        @servertype.set_case(table_name))
  #       sql = "select * from sysibm.sqlcolumns where table_name = #{quote(table_name.upcase)}"
  if @debug == true
    sql = "select * from syscat.columns  where tabname = #{quote(table_name.upcase)}"
    puts_log "SYSIBM.SQLCOLUMNS = #{execute_without_logging(sql).rows}"
  end

  pri_key = primary_key(table_name)

  if stmt
    begin
      # Fetches all the columns and assigns them to col.
      # +col+ is an hash with keys/value pairs for a column
      while col = IBM_DB.fetch_assoc(stmt)
        rowid = false
        puts_log "def columns fecthed = #{col}"
        column_name = col['column_name'].downcase
        sql = "select 1 FROM syscat.columns where tabname = #{quote(table_name.upcase)} and generated = 'D' and colname = '#{col['column_name']}'"
        rows = execute_without_logging(sql).rows
        auto_increment = rows.dig(0, 0) == 1 ? true : nil
        puts_log "def columns auto_increment = #{rows}, #{auto_increment}"

        # Assigns the column default value.
        column_default_value = col['column_def']
        default_value = extract_value_from_default(column_default_value)
        # Assigns the column type
        column_type = col['type_name'].downcase

        if Array(pri_key).include?(column_name) and column_type =~ /integer|bigint/i
          rowid = true
          puts_log "def columns rowid = true"
        end
        # Assigns the field length (size) for the column

        column_length = if column_type =~ /integer|bigint/i
                          col['buffer_length']
                        else
                          col['column_size']
                        end
        column_scale = col['decimal_digits']
        # The initializer of the class Column, requires the +column_length+ to be declared
        # between brackets after the datatype(e.g VARCHAR(50)) for :string and :text types.
        # If it's a "for bit data" field it does a subsitution in place, if not
        # it appends the (column_length) string on the supported data types
        if column_type.match(/decimal|numeric/)
          if column_length > 0 and column_scale > 0
            column_type << "(#{column_length},#{column_scale})"
          elsif column_length > 0 and column_scale == 0
            column_type << "(#{column_length})"
          end
        elsif column_type.match(/timestamp/)
          column_type << "(#{column_scale})"
        elsif column_type.match(/varchar/) and column_length > 0
          column_type << "(#{column_length})"
        end

        column_nullable = col['nullable'] == 1
        # Make sure the hidden column (db2_generated_rowid_for_lobs) in DB2 z/OS isn't added to the list
        next if column_name.match(/db2_generated_rowid_for_lobs/i)

        puts_log "Column type = #{column_type}"
        ruby_type = simplified_type(column_type)
        puts_log "Ruby type after = #{ruby_type}"
        precision = extract_precision(ruby_type)

        if column_type.match(/timestamp|integer|bigint|date|time|blob/i)
          if column_type.match(/timestamp/i)
            precision = column_scale
            unless default_value.nil?
              default_value[10] = ' '
              default_value[13] = ':'
              default_value[16] = ':'
            end
          elsif column_type.match(/time/i)
            unless default_value.nil?
              default_value[2] = ':'
              default_value[5] = ':'
            end
          end
          column_scale = nil
          if !(column_type.match(/blob/i) and column_length != default_blob_length) and !column_type.match(/bigint/i)
            column_length = nil
          end
        elsif column_type.match(/decimal|numeric/)
          precision = column_length
          column_length = nil
        end

        column_type = 'boolean' if ruby_type.to_s == 'boolean'

        puts_log "Inside def columns() - default_value = #{default_value}, column_default_value = #{column_default_value}"
        default_function = extract_default_function(default_value, column_default_value)
        puts_log "Inside def columns() - default_function = #{default_function}"

        sqltype_metadata = SqlTypeMetadata.new(
          # sql_type: sql_type,
          sql_type: column_type,
          type: ruby_type,
          limit: column_length,
          precision: precision,
          scale: column_scale
        )

        columns << Column.new(column_name, default_value, sqltype_metadata, column_nullable, default_function,
                              comment: col['remarks'], auto_increment: auto_increment, rowid: rowid)
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve column metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of column metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
    #             raise error_msg
    ensure # Free resources associated with the statement
      IBM_DB.free_stmt(stmt) if stmt
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve column metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during retrieval of columns metadata')

  end
  # Returns the columns array
  puts_log "Inside def columns() #{columns}"
  columns
end

#commit_db_transaction ⇒ Object

Commits the transaction and turns on auto-committing



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1973

def commit_db_transaction
  puts_log 'commit_db_transaction'
  log('commit transaction', 'TRANSACTION') do
    with_raw_connection(allow_retry: true, materialize_transactions: false) do |conn|
      # Commits the transaction

      IBM_DB.commit @connection
    end
  rescue StandardError
    nil
  end
  # Turns on auto-committing
  auto_commit_on
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1208

def connected?
  puts_log "connected? #{@connection}"
  !(@connection.nil?)
end

#create_alter_table(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3520

def create_alter_table(name)
  puts_log "create_alter_table name = #{name}"
  IBM_DBAdapter::AlterTable.new create_table_definition(name)
end

#create_column_indexes(index_list, column_name, new_column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3162

def create_column_indexes(index_list, column_name, new_column_name)
  puts_log 'create_column_indexes'
  index_list.each do |indexs|
    generated_index_name = index_name(indexs.table, column: indexs.columns)
    custom_index_name = indexs.name
    if indexs.columns.class == Array
      next unless indexs.columns.include?(column_name)

      indexs.columns[indexs.columns.index(column_name)] = new_column_name
    else
      next if indexs.columns != column_name

      indexs.columns = new_column_name
    end

    if generated_index_name == custom_index_name
      add_index(indexs.table, indexs.columns, unique: indexs.unique)
    else
      add_index(indexs.table, indexs.columns, name: custom_index_name, unique: indexs.unique)
    end
  end
end

#create_database(dbName, codeSet = nil, mode = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2169

def create_database(dbName, codeSet = nil, mode = nil)
  puts_log 'create_database'
  connect_str = build_conn_str_for_dbops

  # Ensure connection is closed before trying to drop a database.
  # As a connect call would have been made by call seeing connection in active
  disconnect!

  begin
    createConn = IBM_DB.connect(connect_str, '', '')
  rescue StandardError => e
    raise "Failed to connect to server due to: #{e}"
  end

  if IBM_DB.createDB(createConn, dbName, codeSet, mode)
    IBM_DB.close(createConn)
    true
  else
    error = IBM_DB.getErrormsg(createConn, IBM_DB::DB_CONN)
    IBM_DB.close(createConn)
    raise "Could not create Database due to: #{error}"
  end
end

#create_savepoint(name = current_savepoint_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 669

def create_savepoint(name = current_savepoint_name)
  puts_log 'create_savepoint'
  # Turns off auto-committing
  auto_commit_off
  # Create savepoint
  internal_execute("SAVEPOINT #{name} ON ROLLBACK RETAIN CURSORS", 'TRANSACTION')
end

#create_schema(schema_name, force: nil, if_not_exists: nil) ⇒ Object

Creates a schema for the given schema name.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3355

def create_schema(schema_name, force: nil, if_not_exists: nil)
  puts_log "create_schema #{schema_name}"
  drop_schema(schema_name, if_exists: true)

  execute("CREATE SCHEMA #{quote_schema_name(schema_name)}")
end

#create_schema_dumper(options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3077

def create_schema_dumper(options)
  puts_log 'create_schema_dumper'
  SchemaDumper.create(self, options)
end

#create_table(name, id: :primary_key, primary_key: nil, force: nil, **options) ⇒ Object

DATABASE STATEMENTS



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1217

def create_table(name, id: :primary_key, primary_key: nil, force: nil, **options)
  puts_log "create_table name=#{name}, id=#{id}, primary_key=#{primary_key}, force=#{force}"
  puts_log "create_table Options 1 = #{options}"
  puts_log "primary_key_prefix_type = #{ActiveRecord::Base.primary_key_prefix_type}"
  puts_log caller
  @servertype.setup_for_lob_table
  # Table definition is complete only when a unique index is created on the primarykey column for DB2 V8 on zOS

  # create index on id column if options[:id] is nil or id ==true
  # else check if options[:primary_key]is not nil then create an unique index on that column
  if !id.nil? || !primary_key.nil?
    if !id.nil? && id == true
      @servertype.create_index_after_table(name, 'id')
    elsif !primary_key.nil?
      @servertype.create_index_after_table(name, primary_key.to_s)
    end
  else
    @servertype.create_index_after_table(name, 'id')
  end

  # Just incase if id holds any other data type other than primary_key we override it,
  # otherwise it misses "GENERATED BY DEFAULT AS IDENTITY (START WITH 1000)"
  if !id.nil? && id != false && primary_key.nil? && ActiveRecord::Base.primary_key_prefix_type.nil?
    primary_key = :id
    options[:auto_increment] = true if options[:auto_increment].nil? and %i[integer bigint].include?(id)
  end

  puts_log "create_table Options 2 = #{options}"
  super(name, id: id, primary_key: primary_key, force: force, **options)
end

#create_table_definition(name, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3514

def create_table_definition(name, **options)
  puts_log "create_table_definition name = #{name}"
  puts_log caller
  IBM_DBAdapter::TableDefinition.new(self, name, **options)
end

#create_table_indexes(index_list, new_table) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3136

def create_table_indexes(index_list, new_table)
  puts_log "create_table_indexes index_list = #{index_list}, new_table = #{new_table}"
  index_list.each do |indexs|
    generated_index_name = index_name(indexs.table, column: indexs.columns)
    custom_index_name = indexs.name

    if generated_index_name == custom_index_name
      add_index(new_table, indexs.columns, unique: indexs.unique)
    else
      add_index(new_table, indexs.columns, name: custom_index_name, unique: indexs.unique)
    end
  end
end

#data_source_sql(name = nil, type: nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3009

def data_source_sql(name = nil, type: nil)
  puts_log 'data_source_sql'
  puts_log "servertype = #{@servertype}"
  if @servertype.instance_of? IBM_IDS
    sql = "SELECT tabname FROM systables WHERE"
    if type || name
      conditions = []
      conditions << "tabtype = #{quote(type.upcase)}" if type
      conditions << "tabname = #{quote(name.upcase)}" if name
      sql << " #{conditions.join(' AND ')}"
    end
    sql << " AND owner = #{quote(@schema.upcase)}"
  else
    sql = +'SELECT tabname FROM (SELECT tabname, type FROM syscat.tables '
    sql << " WHERE tabschema = #{quote(@schema.upcase)}) subquery"
    if type || name
      conditions = []
      conditions << "subquery.type = #{quote(type.upcase)}" if type
      conditions << "subquery.tabname = #{quote(name.upcase)}" if name
      sql << " WHERE #{conditions.join(' AND ')}"
    end
  end
  sql
end

#data_sources ⇒ Object

Returns the relation names useable to back Active Record models. For most adapters this means all #tables and #views.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3070

def data_sources
  puts_log 'data_sources'
  query_values(data_source_sql, 'SCHEMA').map(&:downcase)
rescue NotImplementedError
  tables | views
end

#default_sequence_name(table, column) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2006

def default_sequence_name(table, column) # :nodoc:
  puts_log "default_sequence_name table = #{table}, column = #{column}"
  return nil if column.is_a?(Array)
  "#{table}_#{column}_seq"
end

#disable_referential_integrity ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2906

def disable_referential_integrity # :nodoc:
  puts_log 'disable_referential_integrity'
  alter_foreign_keys(tables, true) if supports_disable_referential_integrity?

  yield
ensure
  alter_foreign_keys(tables, false) if supports_disable_referential_integrity?
end

#disconnect! ⇒ Object

Closes the current connection



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1177

def disconnect!
  # Attempts to close the connection. The methods will return:
  # * true if succesfull
  # * false if the connection is already closed
  # * nil if an error is raised
  @lock.synchronize do
    puts_log "disconnect! #{caller}, #{Thread.current}"
    if @connection.nil? || @connection == false
      puts_log "disconnect! return #{caller}, #{Thread.current}"
      return nil
    end

    begin
      super
      IBM_DB.close(@connection)
      puts_log "Connection closed #{Thread.current}"
      @connection = nil
      @raw_connection = nil
    rescue StandardError => e
      puts_log "Connection close failure #{e.message}, #{Thread.current}"
    end
#reset_transaction
  end
end

#distinct(columns, order_by) ⇒ Object

Add distinct clause to the sql if there is no order by specified



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3279

def distinct(columns, order_by)
  puts_log 'distinct'
  if order_by.nil?
    "DISTINCT #{columns}"
  else
    "#{columns}"
  end
end

#drop_column_indexes(index_list, column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3150

def drop_column_indexes(index_list, column_name)
  puts_log 'drop_column_indexes'
  index_list.each do |indexs|
    if indexs.columns.class == Array
      next unless indexs.columns.include?(column_name)
    elsif indexs.columns != column_name
      next
    end
    remove_index(indexs.table, name: indexs.name)
  end
end

#drop_database(dbName) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2145

def drop_database(dbName)
  puts_log 'drop_database'
  connect_str = build_conn_str_for_dbops

  # Ensure connection is closed before trying to drop a database.
  # As a connect call would have been made by call seeing connection in active
  disconnect!

  begin
    dropConn = IBM_DB.connect(connect_str, '', '')
  rescue StandardError => e
    raise "Failed to connect to server due to: #{e}"
  end

  if IBM_DB.dropDB(dropConn, dbName)
    IBM_DB.close(dropConn)
    true
  else
    error = IBM_DB.getErrormsg(dropConn, IBM_DB::DB_CONN)
    IBM_DB.close(dropConn)
    raise "Could not drop Database due to: #{error}"
  end
end

#drop_schema(schema_name, **options) ⇒ Object

Drops the schema for the given schema name.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3363

def drop_schema(schema_name, **options)
  puts_log "drop_schema = #{schema_name}"
  schema_list = internal_exec_query("select schemaname from syscat.schemata where schemaname=#{quote(schema_name.upcase)}", "SCHEMA")
  puts_log "drop_schema schema_list = #{schema_list.columns}, #{schema_list.rows}"
  execute("DROP SCHEMA #{quote_schema_name(schema_name)} RESTRICT") if schema_list.rows.size > 0
end

#drop_table_indexes(index_list) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3129

def drop_table_indexes(index_list)
  puts_log "drop_table_indexes index_list = #{index_list}"
  index_list.each do |indexs|
    remove_index(indexs.table, name: indexs.name)
  end
end

#empty_insert_statement_value(pkey, table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1497

def empty_insert_statement_value(pkey, table_name)
  puts_log "empty_insert_statement_value pkey = #{pkey}, table_name = #{table_name}"
  puts_log caller

  colCount = columns(table_name).count()
  puts_log "empty_insert_statement_value colCount = #{colCount}"
  val = "DEFAULT, " * (colCount - 1)
  val = val + "DEFAULT"
  " VALUES (#{val})"
end

#exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil, returning: nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1611

def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil, returning: nil) # :nodoc:
  puts_log 'exec_insert'
  insert(sql)
end

#exec_insert_db2(sql, name = nil, binds = [], pk = nil, sequence_name = nil, returning = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1595

def exec_insert_db2(sql, name = nil, binds = [], pk = nil, sequence_name = nil, returning = nil)
  puts_log "exec_insert_db2 sql = #{sql}, name = #{name}, binds = #{binds}, pk = #{pk}, returning = #{returning}"
  sql, binds = sql_for_insert(sql, pk, binds, returning)
  exec_query_ret_stmt(sql, name, binds, prepare: false)
end

#exec_query_ret_stmt(sql, name = 'SQL', binds = [], prepare: false, async: false, allow_retry: false) ⇒ Object

Executes sql statement in the context of this connection using binds as the bind substitutes. name is logged along with the executed sql statement. Here prepare argument is not used, by default this method creates prepared statment and execute.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1739

def exec_query_ret_stmt(sql, name = 'SQL', binds = [], prepare: false, async: false, allow_retry: false)
  puts_log "exec_query_ret_stmt #{sql}"
  sql = transform_query(sql)
  check_if_write_query(sql)
  mark_transaction_written_if_write(sql)
  begin
    puts_log "SQL = #{sql}"
    puts_log "Binds = #{binds}"
    param_array = type_casted_binds(binds)
    puts_log "Param array = #{param_array}"
    puts_log "Prepare flag = #{prepare}"
    puts_log "#{caller}"

    stmt = @servertype.prepare(sql, name)
    @statements[sql] = stmt if prepare

    puts_log "Statement = #{stmt}"
    log(sql, name, binds, param_array, async: async) do
      with_raw_connection(allow_retry: allow_retry) do |conn|
        return false unless stmt
        return stmt if execute_prepared_stmt(stmt, param_array)
      end
    end
  rescue => e
    raise translate_exception_class(e, sql, binds)
  ensure
    @offset = @limit = nil
  end
end

#execute(sql, name = nil, allow_retry: false) ⇒ Object

Executes and logs sql commands and returns a IBM_DB.Statement object.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1807

def execute(sql, name = nil, allow_retry: false)
  puts_log "execute #{sql}"
  ActiveRecord::Base.clear_query_caches_for_current_thread
  stmt = internal_execute(sql, name, allow_retry: allow_retry)
  cols = nil
  results = nil
  puts_log "raw_execute stmt = #{stmt}"
  if sql.strip.upcase.start_with?("SELECT") and stmt
    cols = IBM_DB.resultCols(stmt)
    results = fetch_data(stmt)

    puts_log "execute columns = #{cols}"
    puts_log "execute result = #{results}"
  end
  if results.nil? || results.empty?
    stmt
  else
    formatted = cols.each_with_index.map { |col, i| { col => results[i].first } }
    puts_log "raw_execute formatted = #{formatted}"
    formatted.to_s
  end
end

#execute_prepared_stmt(pstmt, param_array = nil) ⇒ Object

Praveen Executes the prepared statement ReturnsTrue on success and False on Failure



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1658

def execute_prepared_stmt(pstmt, param_array = nil)
  puts_log 'execute_prepared_stmt'
  puts_log "Param array = #{param_array}"
  param_array = nil if !param_array.nil? && param_array.size < 1

  if !IBM_DB.execute(pstmt, param_array)
    error_msg = IBM_DB.getErrormsg(pstmt, IBM_DB::DB_STMT)
    puts_log "Error = #{error_msg}"
    IBM_DB.free_stmt(pstmt) if pstmt
    raise StatementInvalid, error_msg
  else
    true
  end
end

#execute_without_logging(sql, name = nil, binds = [], prepare: true, async: false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1694

def execute_without_logging(sql, name = nil, binds = [], prepare: true, async: false)
  puts_log "execute_without_logging sql = #{sql}, name = #{name}, binds = #{binds}"

  sql = transform_query(sql)
  check_if_write_query(sql)
  mark_transaction_written_if_write(sql)
  cols = nil
  results = nil
  begin
    param_array = type_casted_binds(binds)
    puts_log "execute_without_logging Param array = #{param_array}"
    puts_log "execute_without_logging #{caller}"

    stmt = @servertype.prepare(sql, name)
    @statements[sql] = stmt if prepare

    puts_log "execute_without_logging Statement = #{stmt}"

    execute_prepared_stmt(stmt, param_array)

    if stmt and sql.strip.upcase.start_with?("SELECT")
      cols = IBM_DB.resultCols(stmt)
      results = fetch_data(stmt) if stmt

      puts_log "execute_without_logging columns = #{cols}"
      puts_log "execute_without_logging result = #{results}"
    end
  rescue => e
    raise translate_exception_class(e, sql, binds)
  ensure
    @offset = @limit = nil
  end
  if @isAr3
    results
  elsif results.nil?
    ActiveRecord::Result.empty
  else
    ActiveRecord::Result.new(cols, results)
  end
end

#explain(arel, binds = [], options = []) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1684

def explain(arel, binds = [], options = [])
  sql = "EXPLAIN ALL SET QUERYNO = 1 FOR #{to_sql(arel, binds)}"
  stmt = execute(sql, 'EXPLAIN')
  result = select("select * from explain_statement where explain_level = 'P' and queryno = 1", 'EXPLAIN')
  result[0]['total_cost'].to_s
# Ensures to free the resources associated with the statement
ensure
  IBM_DB.free_stmt(stmt) if stmt
end

#extract_default_function(default_value, default) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2797

def extract_default_function(default_value, default)
  default if has_default_function?(default_value, default)
end

#extract_foreign_key_action(specifier) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2893

def extract_foreign_key_action(specifier) # :nodoc:
  puts_log 'extract_foreign_key_action'
  case specifier
  when 0 then :cascade
  when 1 then :restrict
  when 2 then :nullify
  end
end

#extract_precision(sql_type) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2793

def extract_precision(sql_type)
  ::Regexp.last_match(1).to_i if sql_type =~ /\((\d+)(,\d+)?\)/
end

#extract_value_from_default(default) ⇒ Object

method simplified_type



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2626

def extract_value_from_default(default)
  case default
  when /IDENTITY GENERATED BY DEFAULT/i
    nil
  when /^null$/i
    nil
  # Quoted types
  when /^'(.*)'$/m
    ::Regexp.last_match(1).gsub("''", "'")
  # Quoted types
  when /^"(.*)"$/m
    ::Regexp.last_match(1).gsub('""', '"')
  # Numeric types
  when /\A-?\d+(\.\d*)?\z/
    ::Regexp.last_match(0)
  else
    # Anything else is blank or some function
    # and we can't know the value of that, so return nil.
    nil
  end
end

#fetch_data(stmt) ⇒ Object

Calls the servertype select method to fetch the data



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1249

def fetch_data(stmt)
  puts_log 'fetch_data'
  return unless stmt

  begin
    @servertype.select(stmt)
  rescue StandardError => e # Handle driver fetch errors
    error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
    raise StatementInvalid, "Failed to retrieve data: #{error_msg}" if error_msg && !error_msg.empty?

    error_msg += ": #{e.message}" unless e.message.empty?
   #raise error_msg
  ensure
    # Ensures to free the resources associated with the statement
    if stmt
      puts_log "Free Statement #{stmt}"
      IBM_DB.free_stmt(stmt)
    end
  end
end

#foreign_key_exists?(from_table, to_table = nil, **options) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3493

def foreign_key_exists?(from_table, to_table = nil, **options)
  puts_log "foreign_key_exists? from_table = #{from_table}, to_table = #{to_table}, options = #{options}"
  foreign_key_for(from_table, to_table: to_table, **options).present?
end

#foreign_key_for(from_table, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3473

def foreign_key_for(from_table, **options)
  puts_log "foreign_key_for from_table = #{from_table}, options = #{options}"
  return unless use_foreign_keys?
  fks = foreign_keys(from_table)
  puts_log "foreign_key_for fks = #{fks}"
  if options.key?(:column) && options.key?(:to_table) && options[:to_table] != nil
    name = foreign_key_name(from_table, options)
    puts_log "foreign_key_for name = #{options}"
    fks.detect { |fk| fk.defined_for?(name: name) }
  else
    fks.detect { |fk| fk.defined_for?(**options) }
  end
end

#foreign_key_for!(from_table, to_table: nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3487

def foreign_key_for!(from_table, to_table: nil, **options)
  puts_log "foreign_key_for! from_table = #{from_table}, to_table = #{to_table}, options = #{options}"
  foreign_key_for(from_table, to_table: to_table, **options) ||
    raise(ArgumentError, "Table '#{from_table}' has no foreign key for #{to_table || options}")
end

#foreign_key_name(table_name, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3462

def foreign_key_name(table_name, options)
  puts_log "foreign_key_name table_name = #{table_name}, options = #{options}"
  options.fetch(:name) do
    columns = Array(options.fetch(:column)).map(&:to_s)
    identifier = "#{table_name}_#{columns * '_and_'}_fk"
    hashed_identifier = OpenSSL::Digest::SHA256.hexdigest(identifier).first(10)

    "fk_rails_#{hashed_identifier}"
  end
end

#foreign_keys(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2806

def foreign_keys(table_name)
  puts_log "foreign_keys #{table_name}"
  # fetch the foreign keys of the table using function foreign_keys
  # PKTABLE_NAME::  fk_row[2] Name of the table containing the primary key.
  # PKCOLUMN_NAME:: fk_row[3] Name of the column containing the primary key.
  # FKTABLE_NAME::  fk_row[6] Name of the table containing the foreign key.
  # FKCOLUMN_NAME:: fk_row[7] Name of the column containing the foreign key.
  # FK_NAME:: 		 fk_row[11] The name of the foreign key.

  table_name = @servertype.set_case(table_name.to_s)
  foreignKeys = []
  fks_temp = []
  stmt = IBM_DB.foreignkeys(@connection, nil,
                            @servertype.set_case(@schema),
                            @servertype.set_case(table_name), 'FK_TABLE')

  if stmt
    begin
      while (fk_row = IBM_DB.fetch_array(stmt))
        puts_log "foreign_keys fetch = #{fk_row}"
        options = {
          column: fk_row[7].downcase,
          name: fk_row[11].downcase,
          primary_key: fk_row[3].downcase
        }
        options[:on_update] = extract_foreign_key_action(fk_row[9])
        options[:on_delete] = extract_foreign_key_action(fk_row[10])
        fks_temp << ForeignKeyDefinition.new(fk_row[6].downcase, fk_row[2].downcase, options)
      end

      fks_temp.each do |fkst|
        comb = false
        if foreignKeys.size > 0
          foreignKeys.each_with_index do |fks, ind|
            if fks.name == fkst.name
              if foreignKeys[ind].column.kind_of?(Array)
                foreignKeys[ind].column << fkst.column
                foreignKeys[ind].primary_key << fkst.primary_key
              else
                options = {
                  name: fks.name,
                  on_update: nil,
                  on_delete: nil
                }

                options[:column] = []
                options[:column] << fks.column
                options[:column] << fkst.column

                options[:primary_key] = []
                options[:primary_key] << fks.primary_key
                options[:primary_key] << fkst.primary_key

                foreignKeys[ind] = ForeignKeyDefinition.new(fks.from_table, fks.to_table, options)
              end
              comb = true
              break
            end
          end
          foreignKeys << fkst if !comb
        else
          foreignKeys << fkst
        end
      end

    rescue StandardError => e # Handle driver fetch errors
      puts_log "foreign_keys e = #{e}"
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve foreign key metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of foreign key metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
    #             raise error_msg
    ensure # Free resources associated with the statement
      IBM_DB.free_stmt(stmt) if stmt
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve foreign key metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during foreign key retrieval')

  end
  # Returns the foreignKeys array
  foreignKeys
end

#get_database_version ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 908

def get_database_version
  @database_version
end

#getTableIdentityColumn(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1508

def getTableIdentityColumn(table_name)
  query = "SELECT COLNAME FROM SYSCAT.COLUMNS WHERE TABNAME = #{quote(table_name.upcase)} AND IDENTITY = 'Y'"
  puts_log "getTableIdentityColumn table_name = #{table_name}, query = #{query}"
  rows = execute_without_logging(query).rows
  puts_log "getTableIdentityColumn rows = #{rows}"
  if rows.any?
    return rows.first
  end
end

#has_default_function?(default_value, default) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2801

def has_default_function?(default_value, default)
  !default_value && /\w+\(.*\)|CURRENT_TIME|CURRENT_DATE|CURRENT_TIMESTAMP/.match?(default)
  !default_value && /(\w+\(.*\)|CURRENT(?:[_\s]TIME|[_\s]DATE|[_\s]TIMESTAMP))/i.match?(default)
end

#indexes(table_name, _name = nil) ⇒ Object

Returns an array of non-primary key indexes for a specified table name



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2423

def indexes(table_name, _name = nil)
  puts_log 'indexes'
  puts_log "Table = #{table_name}"
  # to_s required because +table_name+ may be a symbol.
  table_name = table_name.to_s
  # Checks if a blank table name has been given.
  # If so it returns an empty array of columns.
  return [] if table_name.strip.empty?

  indexes = []
  pk_index = nil
  index_schema = []

  # fetch the primary keys of the table using function primary_keys
  # TABLE_SCHEM:: pk_index[1]
  # TABLE_NAME:: pk_index[2]
  # COLUMN_NAME:: pk_index[3]
  # PK_NAME:: pk_index[5]
  stmt = IBM_DB.primary_keys(@connection, nil,
                             @servertype.set_case(@schema),
                             @servertype.set_case(table_name))
  if stmt
    begin
      while (pk_index_row = IBM_DB.fetch_array(stmt))
        puts_log "Primary keys = #{pk_index_row}"
        puts_log "pk_index = #{pk_index}"
        next unless pk_index_row[5]

        pk_index_name = pk_index_row[5].downcase
        pk_index_columns = [pk_index_row[3].downcase] # COLUMN_NAME
        if pk_index
          pk_index.columns << pk_index_columns
        else
          pk_index = IndexDefinition.new(table_name, pk_index_name, true, pk_index_columns)
        end
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve primarykey metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of primary key metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
      raise error_msg
    ensure # Free resources associated with the statement
      IBM_DB.free_stmt(stmt) if stmt
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve primary key metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during primary key retrieval')

  end

  # Query table statistics for all indexes on the table
  # "TABLE_NAME:   #{index_stats[2]}"
  # "NON_UNIQUE:   #{index_stats[3]}"
  # "INDEX_NAME:   #{index_stats[5]}"
  # "COLUMN_NAME:  #{index_stats[8]}"
  stmt = IBM_DB.statistics(@connection, nil,
                           @servertype.set_case(@schema),
                           @servertype.set_case(table_name), 1)
  if stmt
    begin
      while (index_stats = IBM_DB.fetch_array(stmt))
        is_composite = false
        next unless index_stats[5] # INDEX_NAME

        index_name = index_stats[5].downcase
        index_unique = (index_stats[3] == 0)
        index_columns = [index_stats[8].downcase] # COLUMN_NAME
        index_qualifier = index_stats[4].downcase # Index_Qualifier
        # Create an IndexDefinition object and add to the indexes array
        i = 0
        indexes.each do |index|
          if index.name == index_name && index_schema[i] == index_qualifier
            # index.columns = index.columns + index_columns
            index.columns.concat index_columns
            is_composite = true
          end
          i += 1
        end

        next if is_composite

        sql = "select remarks from syscat.indexes where tabname = #{quote(table_name.upcase)} and indname = #{quote(index_stats[5])}"
        comment = single_value_from_rows(execute_without_logging(sql, "SCHEMA").rows)

        indexes << IndexDefinition.new(table_name, index_name, index_unique, index_columns,
                                       comment: comment)
        index_schema << index_qualifier
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve index metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of index metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
      raise error_msg
    ensure # Free resources associated with the statement
      IBM_DB.free_stmt(stmt) if stmt
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve index metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during index retrieval')

  end

  # remove the primary key index entry.... should not be dumped by the dumper

  puts_log "Indexes 1 = #{pk_index}"
  i = 0
  indexes.each do |index|
    indexes.delete_at(i) if pk_index && index.columns == pk_index.columns
    i += 1
  end
  # Returns the indexes array
  puts_log "Indexes 2 = #{indexes}"
  indexes
end

#insert(arel, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = [], returning: nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1569

def insert(arel, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = [], returning: nil)
  puts_log "insert Binds P = #{binds}, name = #{name}, pk = #{pk}, id_value = #{id_value}, returning = #{returning}"
  puts_log caller
  if @arelVersion < 6
    sql = to_sql(arel)
    binds = binds
  else
    sql, binds = to_sql_and_binds(arel, binds)
  end

  puts_log "insert Binds A = #{binds}"
  puts_log "insert SQL = #{sql}"
  # unless IBM_DBAdapter.respond_to?(:exec_insert)
  return insert_direct(sql, name, pk, id_value, returning: returning) if binds.nil? || binds.empty?

  ActiveRecord::Base.clear_query_caches_for_current_thread

  return unless stmt = exec_insert_db2(sql, name, binds, pk, sequence_name, returning)

  begin
    return_insert(stmt, sql, binds, pk, id_value, returning: returning)
  ensure
    IBM_DB.free_stmt(stmt) if stmt
  end
end

#insert_direct(sql, name = nil, _pk = nil, id_value = nil, returning: nil) ⇒ Object

Perform an insert and returns the last ID generated. This can be the ID passed to the method or the one auto-generated by the database, and retrieved by the last_generated_id method.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1552

def insert_direct(sql, name = nil, _pk = nil, id_value = nil, returning: nil)
  puts_log "insert_direct sql = #{sql}, name = #{name}, _pk = #{_pk}, returning = #{returning}"
  if @handle_lobs_triggered # Ensure the array of sql is cleared if they have been handled in the callback
    @sql = []
    @handle_lobs_triggered = false
  end

  return unless stmt = execute(sql, name)

  begin
    return_insert(stmt, sql, nil, _pk, id_value, returning: returning)
    # Ensures to free the resources associated with the statement
  ensure
    IBM_DB.free_stmt(stmt) if stmt
  end
end

#insert_fixture(fixture, table_name) ⇒ Object

inserts values from fixtures overridden to handle LOB’s fixture insertion, as, in normal inserts callbacks are triggered but during fixture insertion callbacks are not triggered hence only markers like @@@IBMBINARY@@@ will be inserted and are not updated to actual data



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1435

def insert_fixture(fixture, table_name)
  puts_log "insert_fixture = #{fixture}"
  insert_query = if fixture.respond_to?(:keys)
                   "INSERT INTO #{quote_table_name(table_name)} ( #{fixture.keys.join(', ')})"
                 else
                   "INSERT INTO #{quote_table_name(table_name)} ( #{fixture.key_list})"
                 end

  insert_values = []
  params = []
  if @servertype.instance_of? IBM_IDS
    super
    return
  end
  column_list = columns(table_name)
  fixture.each do |item|
    col = nil
    column_list.each do |column|
      if column.name.downcase == item.at(0).downcase
        col = column
        break
      end
    end

    if item.at(1).nil? ||
       item.at(1) == {} ||
       (item.at(1) == '' && !(col.sql_type.to_s =~ /text|clob/i))
      params << 'NULL'

    elsif !col.nil? && (col.sql_type.to_s =~ /blob|binary|clob|text|xml/i)
      #  Add a '?' for the parameter or a NULL if the value is nil or empty
      # (except for a CLOB field where '' can be a value)
      insert_values << quote_value_for_pstmt(item.at(1))
      params << '?'
    else
      insert_values << quote_value_for_pstmt(item.at(1), col)
      params << '?'
    end
  end

  insert_query << ' VALUES (' + params.join(',') + ')'
  unless stmt = IBM_DB.prepare(@connection, insert_query)
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    if error_msg && !error_msg.empty?
      raise "Failed to prepare statement for fixtures insert due to : #{error_msg}"
    end

    raise StandardError.new('An unexpected error occurred during preparing SQL for fixture insert')

  end

  log(insert_query, 'fixture insert') do
    if IBM_DB.execute(stmt, insert_values)
      IBM_DB.free_stmt(stmt) if stmt
    else
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      IBM_DB.free_stmt(stmt) if stmt
      raise "Failed to insert due to: #{error_msg}"
    end
  end
end

#internal_exec_query(sql, name = 'SQL', binds = [], prepare: false, async: false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1769

def internal_exec_query(sql, name = 'SQL', binds = [], prepare: false, async: false)
  select_prepared(sql, name, binds, prepare: prepare, async: async)
end

#last_inserted_id(result) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1606

def last_inserted_id(result)
  puts_log 'last_inserted_id'
  result
end

#log_query(sql, name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1064

def log_query(sql, name) # :nodoc:
  puts_log 'log_query'
  # Used by handle_lobs
  log(sql, name) {}
end

#native_database_types ⇒ Object

Returns a Hash of mappings from the abstract data types to the native database types



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2103

def native_database_types
  {
    primary_key: { name: @servertype.primary_key_definition(@start_id) },
    string: { name: 'varchar', limit: 400 },
    text: { name: 'clob' },
    integer: { name: 'integer' },
    float: { name: 'float' },
    datetime: { name: 'timestamp' },
    timestamp: { name: 'timestamp' },
    time: { name: 'time' },
    date: { name: 'date' },
    binary: { name: 'blob' },

    # IBM data servers don't have a native boolean type.
    # A boolean can be represented  by a smallint,
    # adopting the convention that False is 0 and True is 1
    boolean: { name: 'smallint' },
    xml: { name: 'xml' },
    decimal: { name: 'decimal' },
    rowid: { name: 'rowid' }, # rowid is a supported datatype on z/OS and i/5
    serial: { name: 'serial' }, # rowid is a supported datatype on Informix Dynamic Server
    char: { name: 'char' },
    double: { name: @servertype.get_double_mapping },
    decfloat: { name: 'decfloat' },
    graphic: { name: 'graphic' },
    vargraphic: { name: 'vargraphic' },
    bigint: { name: 'bigint' }
  }
end

#prepare(sql, name = nil) ⇒ Object

Praveen Prepares and logs sql commands and returns a IBM_DB.Statement object.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1646

def prepare(sql, name = nil)
  puts_log 'prepare'
  # The +log+ method is defined in the parent class +AbstractAdapter+
  @prepared_sql = sql
  log(sql, name) do
    @servertype.prepare(sql, name)
  end
end

#prepared_insert(pstmt, param_array = nil, id_value = nil) ⇒ Object

Praveen Performs an insert using the prepared statement and returns the last ID generated. This can be the ID passed to the method or the one auto-generated by the database, and retrieved by the last_generated_id method.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1620

def prepared_insert(pstmt, param_array = nil, id_value = nil)
  puts_log 'prepared_insert'
  if @handle_lobs_triggered # Ensure the array of sql is cleared if they have been handled in the callback
    @sql                   = []
    @sql_parameter_values  = []
    @handle_lobs_triggered = false
  end

  ActiveRecord::Base.clear_query_caches_for_current_thread

  begin
    if execute_prepared_stmt(pstmt, param_array)
      @sql << @prepared_sql
      @sql_parameter_values << param_array
      id_value || @servertype.last_generated_id(pstmt)
    end
  rescue StandardError => e
    raise e
  ensure
    IBM_DB.free_stmt(pstmt) if pstmt
  end
end

#prepared_statements? ⇒ Boolean Also known as: prepared_statements

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 912

def prepared_statements?
  puts_log 'prepared_statements?'
  prepare = @prepared_statements && !prepared_statements_disabled_cache.include?(object_id)
  puts_log "prepare = #{prepare}"
  prepare
end

#prepared_update(pstmt, param_array = nil) ⇒ Object Also known as: prepared_delete

Praveen



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1869

def prepared_update(pstmt, param_array = nil)
  puts_log 'prepared_update'
  if @handle_lobs_triggered # Ensure the array of sql is cleared if they have been handled in the callback
    @sql                   = []
    @sql_parameter_values  = []
    @handle_lobs_triggered = false
  end

  ActiveRecord::Base.clear_query_caches_for_current_thread

  begin
    if execute_prepared_stmt(pstmt, param_array)
      @sql << @prepared_sql
      @sql_parameter_values << param_array
      # Retrieves the number of affected rows
      IBM_DB.num_rows(pstmt)
      # Ensures to free the resources associated with the statement
    end
  rescue StandardError => e
    raise e
  ensure
    IBM_DB.free_stmt(pstmt) if pstmt
  end
end

#primary_key(table_name) ⇒ Object

Returns the primary key of the mentioned table



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2384

def primary_key(table_name)
  puts_log 'primary_key'
  pk_name = []
  stmt = IBM_DB.primary_keys(@connection, nil,
                             @servertype.set_case(@schema),
                             @servertype.set_case(table_name.to_s))
  if stmt
    begin
      while (pk_index_row = IBM_DB.fetch_array(stmt))
        puts_log "Primary_keys = #{pk_index_row}"
        pk_name << pk_index_row[3].downcase
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve primarykey metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of primary key metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
      raise error_msg
    ensure # Free resources associated with the statement
      IBM_DB.free_stmt(stmt) if stmt
    end
  else
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve primary key metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during primary key retrieval')

  end
  if pk_name.length == 1
    pk_name[0]
  elsif pk_name.empty?
    nil
  else
    pk_name
  end
end

#primary_keys(table_name) ⇒ Object

:nodoc:

Raises:

  • (ArgumentError) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2926

def primary_keys(table_name) # :nodoc:
  puts_log 'primary_keys'
  raise ArgumentError unless table_name.present?

  primary_key(table_name)
end

#puts_log(val) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1078

def puts_log(val)
  begin
  #         puts val
  rescue StandardError
  end
  return unless @debug == true

  log(" IBM_DB = #{val}", 'TRANSACTION') {}
end

#query_values(sql, _name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3004

def query_values(sql, _name = nil) # :nodoc:
  puts_log 'query_values'
  select_prepared(sql).rows.map(&:first)
end

#quote_column_name(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2088

def quote_column_name(name)
  puts_log "quote_column_name #{name}"
  @servertype.check_reserved_words(name).gsub('"', '').gsub("'", '')
end

#quote_schema_name(schema_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3350

def quote_schema_name(schema_name)
  quote_table_name(schema_name)
end

#quote_string(string) ⇒ Object

Quotes a given string, escaping single quote (‘) characters.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2046

def quote_string(string)
  puts_log 'quote_string'
  string.gsub(/'/, "''")
  # string.gsub('\\', '\&\&').gsub("'", "''")
end

#quote_table_name(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2075

def quote_table_name(name)
  puts_log "quote_table_name #{name}"
  puts_log caller
  if name.start_with? '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
    name = "\"#{name}\""
  else
    name = name.to_s
  end
  puts_log "name = #{name}"
  name
  # @servertype.check_reserved_words(name).gsub('"', '').gsub("'",'')
end

#quote_value_for_pstmt(value, column = nil) ⇒ Object

QUOTING



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2016

def quote_value_for_pstmt(value, column = nil)
  puts_log 'quote_value_for_pstmt'
  return value.quoted_id if value.respond_to?(:quoted_id)

  case value
  when String, ActiveSupport::Multibyte::Chars
    value = value.to_s
    if column && column.sql_type.to_s =~ /int|serial|float/i
      column.sql_type.to_s =~ /int|serial/i ? value.to_i : value.to_f

    else
      value
    end
  when NilClass                 then nil
  when TrueClass                then 1
  when FalseClass               then 0
  when Float, Integer, Integer then value
  # BigDecimals need to be output in a non-normalized form and quoted.
  when BigDecimal               then value.to_s('F')
  when Numeric, Symbol          then value.to_s
  else
    if value.acts_like?(:date) || value.acts_like?(:time)
      quoted_date(value)
    else
      value.to_yaml
    end
  end
end

#quoted_binary(value) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2093

def quoted_binary(value)
  puts_log 'quoted_binary'
  "CAST(x'#{value.hex}' AS BLOB)"
end

#quoted_false ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2060

def quoted_false
  puts_log 'quoted_false'
  '0'.freeze
end

#quoted_true ⇒ Object

true is represented by a smallint 1, false by 0, as no native boolean type exists in DB2. Numerics are not quoted in DB2.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2055

def quoted_true
  puts_log 'quoted_true'
  '1'.freeze
end

#raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: true) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1830

def raw_execute(sql, name, async: false, allow_retry: false, materialize_transactions: true)
  # Logs and execute the sql instructions.
  # The +log+ method is defined in the parent class +AbstractAdapter+
  # sql='INSERT INTO ar_internal_metadata (key, value, created_at, updated_at) VALUES ('10', '10', '10', '10')
  puts_log "raw_execute sql = #{sql} #{Thread.current}"
  log(sql, name, async: async) do
    with_raw_connection(allow_retry: allow_retry, materialize_transactions: materialize_transactions) do |conn|
      verify!
      puts_log "raw_execute executes query #{Thread.current}"
      result= @servertype.execute(sql, name)
      puts_log "raw_execute result = #{result} #{Thread.current}"
      verified!
      result
    end
  end
end

#reconnect ⇒ Object

Closes the current connection and opens a new one



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1163

def reconnect
  puts_log "reconnect #{caller} #{Thread.current}"
#disconnect!
  @lock.synchronize do
    puts_log "Before reconnection = #{@connection}, #{Thread.current}"
    connect unless @connection
  end
end

#remove_column(table_name, column_name, _type = nil, **options) ⇒ Object

Removes the column from the table definition.

Examples
remove_column(:suppliers, :qualification)



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3260

def remove_column(table_name, column_name, _type = nil, **options)
  puts_log 'remove_column'
  return if options[:if_exists] == true && !column_exists?(table_name, column_name)

  @servertype.remove_column(table_name, column_name)
end

#remove_columns(table_name, *column_names, type: nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3089

def remove_columns(table_name, *column_names, type: nil, **options)
  if column_names.empty?
    raise ArgumentError.new('You must specify at least one column name. Example: remove_columns(:people, :first_name)')
  end

  remove_column_fragments = remove_columns_for_alter(table_name, *column_names, type: type, **options)
  execute "ALTER TABLE #{quote_table_name(table_name)} #{remove_column_fragments.join(' ')}"
end

#remove_foreign_key(from_table, to_table = nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3498

def remove_foreign_key(from_table, to_table = nil, **options)
  puts_log "remove_foreign_key from_table = #{from_table}, to_table = #{to_table}, options = #{options}"
  #to_table ||= options[:to_table]
  return unless use_foreign_keys?
  #return if options.delete(:if_exists) == true && !foreign_key_exists?(from_table, to_table, **options.slice(:column))
  return if options.delete(:if_exists) == true && !foreign_key_exists?(from_table, to_table)

  fk_name_to_delete = foreign_key_for!(from_table, to_table: to_table, **options).name
  puts_log "remove_foreign_key fk_name_to_delete = #{fk_name_to_delete}"

  at = create_alter_table from_table
  at.drop_foreign_key fk_name_to_delete

  execute schema_creation.accept(at)
end

#remove_foreign_key_byColumn(fkey_list, table_name, column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3231

def remove_foreign_key_byColumn(fkey_list, table_name, column_name)
  puts_log "remove_foreign_key_byColumn = #{table_name}, #{column_name}, #{fkey_list}"
  fkey_removed = false
  fkey_list.each do |fkey|
    if fkey.options[:column] == column_name
      remove_foreign_key(table_name, column: column_name)
      fkey_removed = true
    end
  end
  fkey_removed
end

#remove_index(table_name, column_name = nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3531

def remove_index(table_name, column_name = nil, **options)
  puts_log "remove_index table_name = #{table_name}, column_name = #{column_name}, options = #{options}"
  return if options[:if_exists] && !index_exists?(table_name, column_name, **options)

  execute("DROP INDEX #{index_name_for_remove(table_name, column_name, options)}")
end

#remove_unique_constraint(table_name, column_name = nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3425

def remove_unique_constraint(table_name, column_name = nil, **options)
  puts_log "remove_unique_constraint table_name = #{table_name}, column_name = #{column_name}, options = #{options}"
  unique_name_to_delete = unique_constraint_for!(table_name, column: column_name, **options).name

  puts_log "remove_unique_constraint unique_name_to_delete = #{unique_name_to_delete}"
  at = create_alter_table(table_name)
  at.drop_unique_constraint(unique_name_to_delete)

  execute schema_creation.accept(at)
end

#remove_unique_constraint_byColumn(unique_indexes) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3215

def remove_unique_constraint_byColumn(unique_indexes)
  puts_log "remove_unique_constraint_byColumn = #{unique_indexes}"
  unique_indexes.each do |unq|
    remove_unique_constraint(unq.table_name, unq.column, name: unq.name)
  end
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object

Renames a column in a table.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3186

def rename_column(table_name, column_name, new_column_name) # :nodoc:
  puts_log 'rename_column'
  column_name = quote_column_name(column_name)
  new_column_name = quote_column_name(new_column_name)
  puts_log "rename_column #{table_name}, #{column_name}, #{new_column_name}"
  clear_cache!
  unique_indexes = unique_constraints(table_name)
  puts_log "rename_column Unique Indexes = #{unique_indexes}"
  remove_unique_constraint_byColumn(unique_indexes)
  index_list = indexes(table_name)
  puts_log "rename_column Index List = #{index_list}"
  fkey_list = foreign_keys(table_name)
  puts_log "rename_column ForeignKey = #{fkey_list}"
  drop_column_indexes(index_list, column_name)
  fkey_removed = remove_foreign_key_byColumn(fkey_list, table_name, column_name)
  execute("ALTER TABLE #{quote_table_name(table_name)} #{rename_column_sql(table_name, column_name,
                                                                           new_column_name)}")
  add_unique_constraint_byColumn(unique_indexes, new_column_name)
  add_foreign_keyList(fkey_list, table_name, column_name, new_column_name) if fkey_removed
  create_column_indexes(index_list, column_name, new_column_name)
end

#rename_index(table_name, old_name, new_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3243

def rename_index(table_name, old_name, new_name)
  puts_log 'rename_index'
  old_name = old_name.to_s
  new_name = new_name.to_s
  validate_index_length!(table_name, new_name)

  # this is a naive implementation; some DBs may support this more efficiently (PostgreSQL, for instance)
  old_index_def = indexes(table_name).detect { |i| i.name == old_name }
  return unless old_index_def

  remove_index(table_name, name: old_name)
  add_index(table_name, old_index_def.columns, name: new_name, unique: old_index_def.unique)
end

#rename_table(name, new_name, **options) ⇒ Object

Renames a table.

Example

rename_table(‘octopuses’, ‘octopi’) Overriden to satisfy IBM data servers syntax



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3102

def rename_table(name, new_name, **options)
  puts_log "rename_table name = #{name}, new_name = #{new_name}"
  validate_table_length!(new_name) unless options[:_uses_legacy_table_name]
  clear_cache!
  schema_cache.clear_data_source_cache!(name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  name = quote_column_name(name)
  new_name = quote_column_name(new_name)
  puts_log "90 old_table = #{name}, new_table = #{new_name}"
  # SQL rename table statement
  index_list = indexes(name)
  puts_log "Index List = #{index_list}"
  drop_table_indexes(index_list)
  rename_table_sql = "RENAME TABLE #{name} TO #{new_name}"
  stmt = execute(rename_table_sql)
  create_table_indexes(index_list, new_name)
# Ensures to free the resources associated with the statement
ensure
  IBM_DB.free_stmt(stmt) if stmt
end

#reset! ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1151

def reset!
  puts_log "reset! #{caller} #{Thread.current}"
  @lock.synchronize do
    return connect! unless @connection

    rollback_db_transaction

    super
  end
end

#return_insert(stmt, sql, binds, pk, id_value = nil, returning: nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1518

def return_insert (stmt, sql, binds, pk, id_value = nil, returning: nil)
  puts_log "return_insert sql = #{sql}, pk = #{pk}, returning = #{returning}"
  @sql << sql

  table_name = sql[/\AINSERT\s+INTO\s+([^\s\(]+)/i, 1]
  rowID = getTableIdentityColumn(table_name)
  #Identity column exist.
  if Array(rowID).any?
    val = @servertype.last_generated_id(stmt)
    #returning required is just an ID, or nothing is expected to return
    only_returning_id = Array(returning).empty? ||
                       (Array(returning).size == 1 && Array(rowID).first == Array(returning).first)
    unless only_returning_id
      cols = Array(returning).join(', ')
      query = "SELECT #{cols} FROM #{table_name} WHERE #{Array(rowID).first} = #{val}"
      puts_log "return_insert val = #{val}, cols = #{cols}, table_name = #{table_name}"
      puts_log "return_insert query = #{query}"
      rows = execute_without_logging(query).rows
      puts_log "return_insert rows = #{rows}"
      return rows.first
    end
  end

  puts_log "return_insert id_value = #{id_value}, val = #{val}"
  if !returning.nil?
    [id_value || val]
  else
    id_value || val
  end
end

#rollback_db_transaction ⇒ Object

Rolls back the transaction and turns on auto-committing. Must be done if the transaction block raises an exception or returns false



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1990

def rollback_db_transaction
  puts_log 'rollback_db_transaction'
  log('rollback transaction', 'TRANSACTION') do
    with_raw_connection(allow_retry: true, materialize_transactions: false) do |conn|
      # ROLLBACK the transaction

      IBM_DB.rollback(@connection)
    end
  rescue StandardError
    nil
  end
  ActiveRecord::Base.clear_query_caches_for_current_thread
  # Turns on auto-committing
  auto_commit_on
end

#select(sql, name = nil, binds = [], prepare: false, async: false, allow_retry: false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1270

def select(sql, name = nil, binds = [], prepare: false, async: false, allow_retry: false)
  puts_log "select sql = #{sql}"
  puts_log "binds = #{binds}"
  puts_log "prepare = #{prepare}"

  # Replaces {"= NULL" with " IS NULL"} OR {"IN (NULL)" with " IS NULL"
  begin
    sql.gsub(/(=\s*NULL|IN\s*\(NULL\))/i, ' IS NULL')
  rescue StandardError
    # ...
  end

  if async && async_enabled?
    if current_transaction.joinable?
      raise AsynchronousQueryInsideTransactionError, 'Asynchronous queries are not allowed inside transactions'
    end

    future_result = async.new(
      pool,
      sql,
      name,
      binds,
      prepare: prepare
    )
    if supports_concurrent_connections? && current_transaction.closed?
      future_result.schedule!(ActiveRecord::Base.asynchronous_queries_session)
    else
      future_result.execute!(self)
    end
    return future_result
  end

  results = []
  cols = []

  stmt = if binds.nil? || binds.empty?
           internal_execute(sql, name, allow_retry: allow_retry)
         else
           exec_query_ret_stmt(sql, name, binds, prepare: prepare, async: async, allow_retry: allow_retry)
         end

  if stmt
    cols = IBM_DB.resultCols(stmt)
    results = fetch_data(stmt)
  end

  puts_log "select cols = #{cols}, results = #{results}"

  if @isAr3
    results
  else
    results = ActiveRecord::Result.new(cols, results)
    if async
      results = ActiveRecord::FutureResult::Complete.new(results)
    end
  end

  puts_log "select final results = #{results} #{caller}"
  results
end

#select_prepared(sql, name = nil, binds = [], prepare: true, async: false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1773

def select_prepared(sql, name = nil, binds = [], prepare: true, async: false)
  puts_log 'select_prepared'
  puts_log "select_prepared sql before = #{sql}"
  puts_log "select_prepared Binds = #{binds}"
  stmt = exec_query_ret_stmt(sql, name, binds, prepare: prepare, async: async)
  cols = nil
  results = nil

  if stmt and sql.strip.upcase.start_with?("SELECT")
    cols = IBM_DB.resultCols(stmt)

    results = fetch_data(stmt) if stmt

    puts_log "select_prepared columns = #{cols}"
    puts_log "select_prepared sql after = #{sql}"
    puts_log "select_prepared result = #{results}"
  end
  if @isAr3
    results
  elsif results.nil?
    ActiveRecord::Result.empty
  else
    ActiveRecord::Result.new(cols, results)
  end
end

#simplified_type(field_type) ⇒ Object

Mapping IBM data servers SQL datatypes to Ruby data types



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2587

def simplified_type(field_type)
  puts_log 'simplified_type'
  case field_type
  # if +field_type+ contains 'for bit data' handle it as a binary
  when /for bit data/i
    :binary
  when /smallint/i
    :boolean
  when /int|serial/i
    :integer
  when /decimal|numeric|decfloat/i
    :decimal
  when /float|double|real/i
    :float
  when /timestamp|datetime/i
    :datetime
  when /time/i
    :time
  when /date/i
    :date
  when /vargraphic/i
    :vargraphic
  when /graphic/i
    :graphic
  when /clob|text/i
    :text
  when /xml/i
    :xml
  when /blob|binary/i
    :binary
  when /char/i
    :string
  when /boolean/i
    :boolean
  when /rowid/i # rowid is a supported datatype on z/OS and i/5
    :rowid
  end
end

#simplified_type2(field_type) ⇒ Object

Mapping IBM data servers SQL datatypes to Ruby data types



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2547

def simplified_type2(field_type)
  puts_log 'simplified_type2'
  case field_type
  # if +field_type+ contains 'for bit data' handle it as a binary
  when /for bit data/i
    'binary'
  when /smallint/i
    'boolean'
  when /int|serial/i
    'integer'
  when /decimal|numeric|decfloat/i
    'decimal'
  when /float|double|real/i
    'float'
  when /timestamp|datetime/i
    'timestamp'
  when /time/i
    'time'
  when /date/i
    'date'
  when /vargraphic/i
    'vargraphic'
  when /graphic/i
    'graphic'
  when /clob|text/i
    'text'
  when /xml/i
    'xml'
  when /blob|binary/i
    'binary'
  when /char/i
    'string'
  when /boolean/i
    'boolean'
  when /rowid/i # rowid is a supported datatype on z/OS and i/5
    'rowid'
  end
end

#supports_comments? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1056

def supports_comments?
  true
end

#supports_common_table_expressions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1000

def supports_common_table_expressions?
  true
end

#supports_datetime_with_precision? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1033

def supports_datetime_with_precision?
  puts_log 'supports_datetime_with_precision?'
  true
end

#supports_ddl_transactions? ⇒ Boolean

This Adapter supports DDL transactions. This means CREATE TABLE and other DDL statements can be carried out as a transaction. That is the statements executed can be ROLLED BACK in case of any error during the process.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1041

def supports_ddl_transactions?
  puts_log 'supports_ddl_transactions?'
  true
end

#supports_disable_referential_integrity? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2902

def supports_disable_referential_integrity? # :nodoc:
  true
end

#supports_explain? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1046

def supports_explain?
  puts_log 'supports_explain?'
  true
end

#supports_foreign_keys? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1074

def supports_foreign_keys?
  true
end

#supports_insert_on_duplicate_skip? ⇒ Boolean

IBM Db2 does not natively support skipping rows on insert when there’s a duplicate key

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1010

def supports_insert_on_duplicate_skip?
  false
end

#supports_insert_on_duplicate_update? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1014

def supports_insert_on_duplicate_update?
  false
end

#supports_lazy_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1051

def supports_lazy_transactions?
  puts_log 'supports_lazy_transactions?'
  true
end

#supports_migrations? ⇒ Boolean

This adapter supports migrations. Current limitations: rename_column is not currently supported by the IBM data servers remove_column is not currently supported by the DB2 for zOS data server Tables containing columns of XML data type do not support remove_column

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1023

def supports_migrations?
  puts_log 'supports_migrations?'
  true
end

#supports_partitioned_indexes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1070

def supports_partitioned_indexes?
  true
end

#supports_unique_constraints? ⇒ Boolean

Does this adapter support creating unique constraints?

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1005

def supports_unique_constraints?
  true
end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1060

def supports_views?
  true
end

#table_alias_length ⇒ Object

Returns the maximum length a table alias identifier can be. IBM data servers (cross-platform) table limit is 128 characters



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2304

def table_alias_length
  128
end

#table_comment(table_name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2978

def table_comment(table_name) # :nodoc:
  puts_log "table_comment table_name = #{table_name}"
  sql = "select remarks from syscat.tables where tabname = #{quote(table_name.upcase)}"
  single_value_from_rows(execute_without_logging(sql).rows)
end

#table_exists?(table_name) ⇒ Boolean

Checks to see if the table table_name exists on the database.

table_exists?(:developers)

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3044

def table_exists?(table_name)
  puts_log "table_exists? = #{table_name}"
  query_values(data_source_sql(table_name, type: 'T'), 'SCHEMA').any? if table_name.present?
rescue NotImplementedError
  tables.include?(table_name.to_s)
end

#table_options(table_name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3082

def table_options(table_name) # :nodoc:
  puts_log 'table_options'
  return unless comment = table_comment(table_name)

  { comment: comment }
end

#tables ⇒ Object

Returns an array of table names defined in the database.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2309

def tables(_name = nil)
  puts_log 'tables'
  # Initializes the tables array
  tables = []
  # Retrieve table's metadata through IBM_DB driver
  stmt = IBM_DB.tables(@connection, nil,
                       @servertype.set_case(@schema))
  if stmt
    begin
      # Fetches all the records available
      while tab = IBM_DB.fetch_assoc(stmt)
        # Adds the lowercase table name to the array
        if tab['table_type'] == 'TABLE' # check, so that only tables are dumped,IBM_DB.tables also returns views,alias etc in the schema
          tables << tab['table_name'].downcase
        end
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve table metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of table metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
      raise error_msg
    ensure
      IBM_DB.free_stmt(stmt) if stmt # Free resources associated with the statement
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve tables metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during retrieval of table metadata')

  end
  # Returns the tables array
  tables
end

#text_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3346

def text_type?(type)
  TYPE_MAP.lookup(type).is_a?(Type::String) || TYPE_MAP.lookup(type).is_a?(Type::Text)
end

#to_sql(arel, binds = []) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 989

def to_sql(arel, binds = [])
  if arel.respond_to?(:ast)
    visitor.accept(arel.ast) do
      quote(*binds.shift.reverse)
    end
  else
    arel
  end
end

#translate_exception(exception, message:, sql:, binds:) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1331

def translate_exception(exception, message:, sql:, binds:)
  puts_log "translate_exception - exception = #{exception}, message = #{message}"
  puts_log "translate_exception #{caller}"
  error_msg1 = /SQL0803N  One or more values in the INSERT statement, UPDATE statement, or foreign key update caused by a DELETE statement are not valid because the primary key, unique constraint or unique index identified by .* constrains table .* from having duplicate values for the index key/
  error_msg2 = /SQL0204N  .* is an undefined name/
  error_msg3 = /SQL0413N  Overflow occurred during numeric data type conversion/
  error_msg4 = /SQL0407N  Assignment of a NULL value to a NOT NULL column .* is not allowed/
  error_msg5 = /SQL0530N  The insert or update value of the FOREIGN KEY .* is not equal to any value of the parent key of the parent table/
  error_msg6 = /SQL0532N  A parent row cannot be deleted because the relationship .* restricts the deletion/
  error_msg7 = /SQL0433N  Value .* is too long/
  error_msg8 = /CLI0109E  String data right truncation/
  if !error_msg1.match(message).nil?
    puts_log 'RecordNotUnique exception'
    RecordNotUnique.new(message, sql: sql, binds: binds, connection_pool: @pool)
  elsif !error_msg2.match(message).nil?
    puts_log 'ArgumentError exception'
    ArgumentError.new(message)
  elsif !error_msg3.match(message).nil?
    puts_log 'RangeError exception'
    RangeError.new(message, sql: sql, binds: binds, connection_pool: @pool)
  elsif !error_msg4.match(message).nil?
    puts_log 'NotNullViolation exception'
    NotNullViolation.new(message, sql: sql, binds: binds, connection_pool: @pool)
  elsif !error_msg5.match(message).nil? or !error_msg6.match(message).nil?
    puts_log 'InvalidForeignKey exception'
    InvalidForeignKey.new(message, sql: sql, binds: binds, connection_pool: @pool)
  elsif !error_msg7.match(message).nil? or !error_msg8.match(message).nil?
    puts_log 'ValueTooLong exception'
    ValueTooLong.new(message, sql: sql, binds: binds, connection_pool: @pool)
  elsif exception.message.match?(/called on a closed database/i)
    puts_log 'ConnectionNotEstablished exception'
    ConnectionNotEstablished.new(exception, connection_pool: @pool)
  elsif message.strip.start_with?("FrozenError") or
        message.strip.start_with?("ActiveRecord::Encryption::Errors::Encoding:") or
        message.strip.start_with?("ActiveRecord::Encryption::Errors::Encryption") or
        message.strip.start_with?("ActiveRecord::ConnectionFailed")
    exception
  else
    super(message, message: exception, sql: sql, binds: binds)
  end
end

#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object

IBM data servers do not support limits on certain data types (unlike MySQL) Limit is supported for the decimal, numeric, varchar, clob, blob, graphic, vargraphic data types.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2199

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  puts_log 'type_to_sql'
  puts_log "Type = #{type}, Limit = #{limit}"
  puts_log "type_to_sql = #{caller}"

  if type.to_sym == :binary and limit.class == Hash and limit.has_key?('limit'.to_sym)
    sql_segment = native_database_types[type.to_sym][:name].to_s
    sql_segment << "(#{limit[:limit]})"
    return sql_segment
  end

  if type.to_sym == :datetime and limit.class == Hash and limit.has_key?('precision'.to_sym)
    sql_segment = native_database_types[type.to_sym][:name].to_s
    if limit[:precision].nil?
      return sql_segment
    elsif (0..12).include?(limit[:precision])
      sql_segment << "(#{limit[:precision]})"
      return sql_segment
    else
      raise ArgumentError,
            "No #{sql_segment} type has precision of #{limit[:precision]}. The allowed range of precision is from 0 to 12"
    end
  end

  if type.to_sym == :string and limit.class == Hash and limit.has_key?('limit'.to_sym)
    sql_segment = native_database_types[type.to_sym][:name].to_s
    sql_segment << "(#{limit[:limit]})"
    return sql_segment
  end

  if type.to_sym == :decimal
    precision = limit[:precision] if limit.class == Hash && limit.has_key?('precision'.to_sym)
    scale = limit[:scale] if limit.class == Hash && limit.has_key?('scale'.to_sym)
    sql_segment = native_database_types[type.to_sym][:name].to_s
    if !precision.nil? && !scale.nil?
      sql_segment << "(#{precision},#{scale})"
      return sql_segment
    elsif scale.nil? && !precision.nil?
      sql_segment << "(#{precision})"
      return sql_segment
    elsif precision.nil? && !scale.nil?
      raise ArgumentError, 'Error adding decimal column: precision cannot be empty if scale is specified'
    else
      return sql_segment
    end
  end

  if type.to_sym == :decfloat
    sql_segment = native_database_types[type.to_sym][:name].to_s
    sql_segment << "(#{precision})" unless precision.nil?
    return sql_segment
  end

  if type.to_sym == :vargraphic
    sql_segment = native_database_types[type.to_sym][:name].to_s
    if limit.class == Hash
      return 'vargraphic(1)' unless limit.has_key?('limit'.to_sym)

      limit1 = limit[:limit]
      sql_segment << "(#{limit1})"

    else
      return 'vargraphic(1)' if limit.nil?

      sql_segment << "(#{limit})"

    end
    return sql_segment
  end

  if type.to_sym == :graphic
    sql_segment = native_database_types[type.to_sym][:name].to_s
    if limit.class == Hash
      return 'graphic(1)' unless limit.has_key?('limit'.to_sym)

      limit1 = limit[:limit]
      sql_segment << "(#{limit1})"

    else
      return 'graphic(1)' if limit.nil?

      sql_segment << "(#{limit})"

    end
    return sql_segment
  end

  if limit.class == Hash
    return super(type) if limit.has_key?('limit'.to_sym).nil?
  elsif limit.nil?
    return super(type)
  end

  # strip off limits on data types not supporting them
  if @servertype.limit_not_supported_types.include? type.to_sym
    native_database_types[type.to_sym][:name].to_s
  elsif type.to_sym == :boolean
    'smallint'
  else
    super(type)
  end
end

#unique_constraint_for(table_name, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3447

def unique_constraint_for(table_name, **options)
  puts_log "unique_constraint_for table_name = #{table_name}, options = #{options}"
  name = unique_constraint_name(table_name, **options)
  puts_log "unique_constraint_for name = #{name}"
  uq = unique_constraints(table_name)
  puts_log "unique_constraint_for unique_constraints = #{uq}"
  uq.detect { |unique_constraint| unique_constraint.defined_for?(name: name) }
end

#unique_constraint_for!(table_name, column: nil, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3456

def unique_constraint_for!(table_name, column: nil, **options)
  puts_log "unique_constraint_for! table_name = #{table_name}, column = #{column}, options = #{options}"
  unique_constraint_for(table_name, column: column, **options) ||
  raise(ArgumentError, "Table '#{table_name}' has no unique constraint for #{column || options}")
end

#unique_constraint_name(table_name, **options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3436

def unique_constraint_name(table_name, **options)
  puts_log "unique_constraint_name table_name = #{table_name}, options = #{options}"
  options.fetch(:name) do
    column_or_index = Array(options[:column] || options[:using_index]).map(&:to_s)
    identifier = "#{table_name}_#{column_or_index * '_and_'}_unique"
    hashed_identifier = Digest::SHA256.hexdigest(identifier).first(10)

    "uniq_rails_#{hashed_identifier}"
  end
end

#unique_constraint_options(table_name, column_name, options) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3379

def unique_constraint_options(table_name, column_name, options) # :nodoc:
  assert_valid_deferrable(options[:deferrable])

  if column_name && options[:using_index]
    raise ArgumentError, "Cannot specify both column_name and :using_index options."
  end

  options = options.dup
  options[:name] ||= unique_constraint_name(table_name, column: column_name, **options)
  options
end

#unique_constraints(table_name) ⇒ Object

Returns an array of unique constraints for the given table. The unique constraints are represented as UniqueConstraintDefinition objects.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3393

def unique_constraints(table_name)
  puts_log "unique_constraints table_name = #{table_name}"
  puts_log "unique_constraints #{caller}"
  table_name = table_name.to_s
  if table_name.include?(".")
    schema_name, table_name = table_name.split(".")
    puts_log "unique_constraints split schema_name = #{schema_name}, table_name = #{table_name}"
  else
    schema_name = @schema
  end
  unique_info = internal_exec_query(<<~SQL, "SCHEMA")
    SELECT KEYCOL.CONSTNAME, KEYCOL.COLNAME FROM SYSCAT.KEYCOLUSE KEYCOL
        INNER JOIN SYSCAT.TABCONST TABCONST ON KEYCOL.CONSTNAME=TABCONST.CONSTNAME
        WHERE TABCONST.TABSCHEMA=#{quote(schema_name.upcase)} and
        TABCONST.TABNAME=#{quote(table_name.upcase)} and TABCONST.TYPE='U'
  SQL

  puts_log "unique_constraints unique_info = #{unique_info.columns}, #{unique_info.rows}"
  unique_info.map do |row|
    puts_log "unique_constraints row = #{row}"
    columns = []
    columns << row["colname"].downcase

    options = {
      name: row["constname"].downcase,
      deferrable: false
    }

    UniqueConstraintDefinition.new(table_name, columns, options)
  end
end

#unquoted_false ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2070

def unquoted_false
  puts_log 'unquoted_false'
  0
end

#unquoted_true ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2065

def unquoted_true
  puts_log 'unquoted_true'
  1
end

#update(arel, name = nil, binds = []) ⇒ Object Also known as: delete 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1898

def update(arel, name = nil, binds = [])
  puts_log 'update'
  if @arelVersion < 6
    sql = to_sql(arel)
  else
    sql, binds = to_sql_and_binds(arel, binds)
  end

  # Make sure the WHERE clause handles NULL's correctly
  sqlarray = sql.split(/\s*WHERE\s*/)
  size = sqlarray.size
  if size > 1
    sql = sqlarray[0] + ' WHERE '
    if size > 2
      1.upto size - 2 do |index|
        sqlarray[index].gsub!(/(=\s*NULL|IN\s*\(NULL\))/i, ' IS NULL') unless sqlarray[index].nil?
        sql = sql + sqlarray[index] + ' WHERE '
      end
    end
    sqlarray[size - 1].gsub!(/(=\s*NULL|IN\s*\(NULL\))/i, ' IS NULL') unless sqlarray[size - 1].nil?
    sql += sqlarray[size - 1]
  end

  ActiveRecord::Base.clear_query_caches_for_current_thread

  if binds.nil? || binds.empty?
    update_direct(sql, name)
  else
    begin
      if stmt = exec_query_ret_stmt(sql, name, binds, prepare: true)
        IBM_DB.num_rows(stmt)
      end
    ensure
      IBM_DB.free_stmt(stmt) if stmt
    end
  end
end

#update_direct(sql, name = nil) ⇒ Object

Executes an “UPDATE” SQL statement



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1848

def update_direct(sql, name = nil)
  puts_log 'update_direct'
  if @handle_lobs_triggered # Ensure the array of sql is cleared if they have been handled in the callback
    @sql = []
    @handle_lobs_triggered = false
  end

  # Logs and execute the given sql query.
  return unless stmt = execute(sql, name)

  begin
    @sql << sql
    # Retrieves the number of affected rows
    IBM_DB.num_rows(stmt)
    # Ensures to free the resources associated with the statement
  ensure
    IBM_DB.free_stmt(stmt) if stmt
  end
end

#use_foreign_keys? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1028

def use_foreign_keys?
  puts_log 'use_foreign_keys?'
  true
end

#valid_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2193

def valid_type?(type)
  !native_database_types[type].nil?
end

#view_exists?(view_name) ⇒ Boolean

Checks to see if the view view_name exists on the database.

view_exists?(:ebooks)

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 3061

def view_exists?(view_name)
  puts_log 'view_exists?'
  query_values(data_source_sql(view_name, type: 'V'), 'SCHEMA').any? if view_name.present?
rescue NotImplementedError
  views.include?(view_name.to_s)
end

#views ⇒ Object

Returns an array of view names defined in the database.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2347

def views
  puts_log 'views'
  # Initializes the tables array
  tables = []
  # Retrieve view's metadata through IBM_DB driver
  stmt = IBM_DB.tables(@connection, nil, @servertype.set_case(@schema))
  if stmt
    begin
      # Fetches all the records available
      while tab = IBM_DB.fetch_assoc(stmt)
        # Adds the lowercase view's name to the array
        if tab['table_type'] == 'V' # check, so that only views are dumped,IBM_DB.tables also returns tables,alias etc in the schema
          tables << tab['table_name'].downcase
        end
      end
    rescue StandardError => e # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT)
      raise "Failed to retrieve views metadata during fetch: #{error_msg}" if error_msg && !error_msg.empty?

      error_msg = 'An unexpected error occurred during retrieval of views metadata'
      error_msg += ": #{e.message}" unless e.message.empty?
      raise error_msg
    ensure
      IBM_DB.free_stmt(stmt) if stmt # Free resources associated with the statement
    end
  else # Handle driver execution errors
    error_msg = IBM_DB.getErrormsg(@connection, IBM_DB::DB_CONN)
    raise "Failed to retrieve tables metadata due to error: #{error_msg}" if error_msg && !error_msg.empty?

    raise StandardError.new('An unexpected error occurred during retrieval of views metadata')

  end
  # Returns the tables array
  tables
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1678

def write_query?(sql) # :nodoc:
  !READ_QUERY.match?(sql)
rescue ArgumentError # Invalid encoding
  !READ_QUERY.match?(sql.b)
end