Class: ActiveRecord::ConnectionAdapters::IBM_DBAdapter

Inherits:
AbstractAdapter
  • Object
show all
Includes:
QueryCache
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: SchemaDumper, StatementPool

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(connection, ar3, logger, config, conn_options) ⇒ IBM_DBAdapter

Returns a new instance of IBM_DBAdapter.



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 720

def initialize(connection, ar3, logger, config, conn_options)
  # Caching database connection configuration (+connect+ or +reconnect+ support)\
	    @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
  if config.has_key?(:schema)
    @schema         = config[:schema]
  else
    @schema         = 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
  # which sets @connection, @logger, @runtime and @last_verification
  super(@connection, logger, @config)

  if @connection
    server_info = IBM_DB.server_info( @connection )
    if( server_info )
      case server_info.DBMS_NAME
        when /DB2\//i             # DB2 for Linux, Unix and Windows (LUW)
          case server_info.DBMS_VER
            when /09.07/i          # DB2 Version 9.7 (Cobra)
              @servertype = IBM_DB2_LUW_COBRA.new(self, @isAr3)
            when /10./i #DB2 version 10.1 and above
              @servertype = IBM_DB2_LUW_COBRA.new(self, @isAr3)
            else                  # DB2 Version 9.5 or below
              @servertype = 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
  if config.has_key?(:start_id)
    @start_id = config[:start_id]
  else
    @start_id = 1
  end

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

  if(@arelVersion >=  3 )
    @visitor = Arel::Visitors::IBM_DB.new self
  end
		
  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 701

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 701

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 701

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 699

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 700

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 702

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 701

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 699

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 702

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 700

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 700

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 701

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 905

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 999

def active?
  puts_log "active?"
  IBM_DB.active @connection
  rescue
    false
end

#adapter_name ⇒ Object

Name of the adapter



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 705

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 2620

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 2834

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 2646

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

#alter_foreign_keys(tables, not_enforced) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2580

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|
         execute("ALTER TABLE #{@servertype.set_case(fk.from_table)} ALTER FOREIGN KEY #{@servertype.set_case(fk.name)} #{enforced}")
       end
     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 1663

def begin_db_transaction
  puts_log "begin_db_transaction"
  log("begin transaction", "TRANSACTION") {
  # Turns off the auto-commit
  IBM_DB.autocommit(@connection, IBM_DB::SQL_AUTOCOMMIT_OFF) }
end

#bind_params_length ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 848

def bind_params_length
  999
end

#build_conn_str_for_dbops ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1814

def build_conn_str_for_dbops()
  puts_log "build_conn_str_for_dbops"
  connect_str = "DRIVER={IBM DB2 ODBC DRIVER};ATTACH=true;"
  if(!@host.nil?)
    connect_str << "HOSTNAME=#{@host};"
    connect_str << "PORT=#{@port};"
    connect_str << "PROTOCOL=TCPIP;"
  end
  connect_str << "UID=#{@username};PWD=#{@password};"
  return 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 1216

def build_fixture_sql(fixtures, table_name)
  puts_log "build_fixture_sql"
  columns = schema_cache.columns_hash(table_name)

  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
  manager.into(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 1209

def build_fixture_statements(fixture_set)
  fixture_set.flat_map do |table_name, fixtures|
    next if fixtures.empty?
    fixtures.map { |fixture| build_fixture_sql([fixture], table_name) }
  end.compact
end

#build_statement_pool ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 716

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 1204

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 2882

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 2597

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 2905

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 2911

def change_column_null(table_name, column_name, null, default = nil)
  puts_log "change_column_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 2609

def change_table_comment(table_name, comment_or_changes) # :nodoc:
  puts_log "change_table_comment"
  clear_cache!
  comment = extract_new_comment_value(comment_or_changes)
  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



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1548

def check_if_write_query(sql) #For rails 7.1 just remove this function as it will be defined in AbstractAdapter class
  if preventing_writes? && write_query?(sql)
    raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}"
  end
end

#column_for(table_name, column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2922

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 2356

def columns(table_name)        
  default_blob_length = 1048576
# to_s required because it may be a symbol.
  puts_log "columns"
  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 = #{select_prepared(sql).rows}"
  end

  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)
        puts_log col
        column_name = col["column_name"].downcase
        # 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

        # Assigns the field length (size) for the column
			  
        if column_type =~ /integer|bigint/i
          column_length = col["buffer_length"]
        else
          column_length = 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) ? true : false
        # Make sure the hidden column (db2_generated_rowid_for_lobs) in DB2 z/OS isn't added to the list
        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
              if !default_value.nil?
                default_value[10] = " "
                default_value[13] = ":"
                default_value[16] = ":"
              end
            elsif column_type.match(/time/i)
              if !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

          if ruby_type.to_s == "boolean"
            column_type = "boolean"
          end

          default_function = extract_default_function(default_value, column_default_value)

				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"])
        end
      end
    rescue StandardError => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve column metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of column metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
#             raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve column metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during retrieval of columns metadata')
    end
  end
  # Returns the columns array
  puts_log "Inside def columns() #{columns}"
  return 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 1671

def commit_db_transaction
  puts_log "commit_db_transaction"
  log("commit transaction", "TRANSACTION") {
  # Commits the transaction
  IBM_DB.commit @connection rescue nil }
  # Turns on auto-committing
  IBM_DB.autocommit @connection, IBM_DB::SQL_AUTOCOMMIT_ON
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 2795

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 if !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 1850

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 => connect_err
    raise "Failed to connect to server due to: #{connect_err}"
  end

  if(IBM_DB.createDB(createConn,dbName,codeSet,mode))
    IBM_DB.close(createConn)
    return 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_schema_dumper(options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2720

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 1069

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 = #{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 (id == :integer or id == :bigint)
  end

  super(name, id: id, primary_key: primary_key, force: force, **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 2769

def create_table_indexes(index_list, new_table)
  puts_log "create_table_indexes"
  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 2664

def data_source_sql(name = nil, type: nil)
     puts_log "data_source_sql"
		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
		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 2713

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 1692

def default_sequence_name(table, column) # :nodoc:
  puts_log "72"
  "#{table}_#{column}_seq"
end

#disable_referential_integrity ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2567

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

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

#disconnect! ⇒ Object

Closes the current connection



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1053

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
  puts_log "disconnect!"
  return nil if @connection.nil? || @connection == false
  IBM_DB.close(@connection) rescue nil
  @connection = nil
  reset_transaction
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 2889

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 2783

def drop_column_indexes(index_list, column_name)
  puts_log "drop_column_indexes"
  index_list.each do |indexs|
    if indexs.columns.class == Array
      next if !indexs.columns.include?(column_name)
    else
      next if indexs.columns != column_name
    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 1826

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 => connect_err
    raise "Failed to connect to server due to: #{connect_err}"
  end

  if(IBM_DB.dropDB(dropConn,dbName))
    IBM_DB.close(dropConn)
    return 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_table_indexes(index_list) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2762

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

#empty_insert_statement_value(pkey) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1325

def empty_insert_statement_value(pkey)
  if !pkey.nil?
    "(#{pkey}) VALUES (DEFAULT)"
  else
    raise ArgumentError, "Empty Insert Statement not allowed in DB2"
  end
end

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

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1394

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

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



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1383

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

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



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

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

#exec_query_ret_stmt(sql, name = 'SQL', binds = [], prepare = 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 1484

def exec_query_ret_stmt(sql, name = 'SQL', binds = [], prepare = false)
  puts_log "exec_query_ret_stmt #{sql}"
  sql = transform_query(sql)
  check_if_write_query(sql)
  materialize_transactions
  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)
    if prepare 
      @statements[sql] = stmt
    end
    
    puts_log "Statement = #{stmt}"
    log(sql, name, binds, param_array) do
      if( stmt )
        if(execute_prepared_stmt(stmt, param_array))
          return stmt
        end
      else
        return false
      end
    end
  ensure
    @offset = @limit = nil
  end
end

#execute(sql, name = nil) ⇒ 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 1556

def execute(sql, name=nil)
  # 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 "execute"
  puts_log "#{sql}"
  sql = transform_query(sql)
  check_if_write_query(sql)
  materialize_transactions
  mark_transaction_written_if_write(sql)
  log(sql , name) do
    @servertype.execute(sql, name)
  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 1442

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

  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
    return true
  end
end

#explain(arel, binds = []) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1470

def explain(arel, binds = [])
  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")
  return 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 2493

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 2554

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

#extract_precision(sql_type) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2489

def extract_precision(sql_type)
  $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 2333

def extract_value_from_default(default)
  case default
  when /IDENTITY GENERATED BY DEFAULT/i
    nil
  when /^null$/i
    nil
  # Quoted types
  when /^'(.*)'$/m
    $1.gsub("''", "'")
  # Quoted types
  when /^"(.*)"$/m
    $1.gsub('""', '"')
  # Numeric types
  when /\A-?\d+(\.\d*)?\z/
    $&
  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 1100

def fetch_data(stmt)
  puts_log "fetch_data"
  if(stmt)
    begin
      return @servertype.select(stmt)
    rescue StandardError => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise StatementInvalid,"Failed to retrieve data: #{error_msg}"
      else
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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
end

#foreign_keys(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2501

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 = []
  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])
			  foreignKeys << ForeignKeyDefinition.new(fk_row[6].downcase, fk_row[2].downcase, options) 
      end			

    rescue StandardError => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve foreign key metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of foreign key metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
#             raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve foreign key metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during foreign key retrieval')		
    end		  
  end
	    #Returns the foreignKeys array
	    return foreignKeys
end

#get_database_version ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 836

def get_database_version
  @database_version
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 2497

def has_default_function?(default_value, default)
  !default_value && %r{\w+\(.*\)|CURRENT_TIME|CURRENT_DATE|CURRENT_TIMESTAMP}.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 2123

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}"
        if 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 
      end
    rescue StandardError => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve primarykey metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of primary key metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve primary key metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during primary key retrieval')
    end
  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
        if 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 = i+1
          end
        
          unless 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(select_prepared(sql).rows)

            indexes << IndexDefinition.new(table_name, index_name, index_unique, index_columns, comment: comment)
            index_schema << index_qualifier
          end 
        end
      end
    rescue StandardError => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve index metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of index metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve index metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during index retrieval')
    end
  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|
    if pk_index && index.columns == pk_index.columns
      indexes.delete_at(i)
    end
    i = i+1
  end 
  # Returns the indexes array
  puts_log "Indexes 2 = #{indexes}"
  return indexes
end

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



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1356

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

  puts_log "Binds 2 = #{binds}"
  puts_log "SQL = #{sql}"
  #unless IBM_DBAdapter.respond_to?(:exec_insert)
  if binds.nil? || binds.empty?
    return insert_direct(sql, name, pk, id_value, sequence_name)
  end

  ActiveRecord::Base.clear_query_caches_for_current_thread
    
		if stmt = exec_insert_db2(sql, name, binds)
    begin
      @sql << sql
      return id_value || @servertype.last_generated_id(stmt)
    ensure
      IBM_DB.free_stmt(stmt) if stmt
    end
  end
end

#insert_direct(sql, name = nil, pk = nil, id_value = nil, sequence_name = 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 1336

def insert_direct(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
  puts_log "insert_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

  ActiveRecord::Base.clear_query_caches_for_current_thread

  if stmt = execute(sql, name)
    begin
      @sql << sql
      return id_value || @servertype.last_generated_id(stmt)
      # Ensures to free the resources associated with the statement
    ensure
      IBM_DB.free_stmt(stmt) if stmt
    end
  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 1264

def insert_fixture(fixture, table_name)
  puts_log "insert_fixture = #{fixture}"
  if(fixture.respond_to?(:keys))
    insert_query = "INSERT INTO #{quote_table_name(table_name)} ( #{fixture.keys.join(', ')})"
  else
    insert_query = "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}"
     else
       raise StandardError.new('An unexpected error occurred during preparing SQL for fixture insert')
     end
  end
    
  log(insert_query,'fixture insert') do
    unless IBM_DB.execute(stmt, insert_values)
      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}"
    else
      IBM_DB.free_stmt(stmt) if stmt
    end
  end
end

#last_inserted_id(result) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1389

def last_inserted_id(result)
  puts_log "last_inserted_id"
  return result
end

#log_query(sql, name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 974

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 1784

def native_database_types
  {
    :primary_key => { :name => @servertype.primary_key_definition(@start_id) },
    :string      => { :name => "varchar", :limit => 255 },
    :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 1430

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 1404

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
      return id_value || @servertype.last_generated_id(pstmt)
    end
  rescue StandardError => insert_err
    raise insert_err
  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 840

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 1593

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 => updt_err
    raise updt_err
  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 2081

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 => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg( stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve primarykey metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of primary key metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve primary key metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during primary key retrieval')
    end
  end
  if pk_name.length() == 1
    return pk_name[0]
  elsif pk_name.empty?
    return nil
  else
    return 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 2590

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 984

def puts_log (val)
  begin
#         puts val
  rescue
  end
  if @debug == true
    log(" IBM_DB = #{val}", "TRANSACTION"){}
  end
end

#query_values(sql, name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2659

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 1769

def quote_column_name(name)
  puts_log "quote_column_name"
  @servertype.check_reserved_words(name).gsub('"', '').gsub("'",'')
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 1731

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 1760

def quote_table_name(name)
  puts_log "quote_table_name"
  if name.start_with?'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
    name = "\"#{name}\""
  end
  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 1701

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 then
      value = value.to_s
			if column && column.sql_type.to_s =~ /int|serial|float/i
        value = column.sql_type.to_s =~ /int|serial/i ? value.to_i : value.to_f
        value
      else
        value
      end
    when NilClass                 then nil
    when TrueClass                then 1
    when FalseClass               then 0
    when Float, Fixnum, Bignum    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 1774

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 1745

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 1740

def quoted_true
  puts_log "quoted_true"
  "1".freeze
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 1046

def reconnect!
  puts_log "reconnect!"
  disconnect!
  connect
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 2871

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 2732

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_byColumn(fkey_list, table_name, column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 2843

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 2916

def remove_index(table_name, column_name = nil, **options)
  puts_log "remove_index"
  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

#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 2817

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!
  index_list = indexes(table_name)
  puts_log "Index List = #{index_list}"
  fkey_list = foreign_keys(table_name)
  puts_log "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_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 2855

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) ⇒ 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 2745

def rename_table(name, new_name)
	    puts_log "rename_table"
  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

#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 1682

def rollback_db_transaction
  puts_log "rollback_db_transaction"
  log("rollback transaction", "TRANSACTION") {
  # ROLLBACK the transaction
  IBM_DB.rollback(@connection) rescue nil }
  ActiveRecord::Base.clear_query_caches_for_current_thread
  # Turns on auto-committing
  IBM_DB.autocommit @connection, IBM_DB::SQL_AUTOCOMMIT_ON
end

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



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1123

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

  if(binds.nil? || binds.empty?)
    stmt = execute(sql, name)
  else
    stmt = exec_query_ret_stmt(sql, name, binds, prepare)
  end

  cols = IBM_DB.resultCols(stmt)

  if( stmt ) 
    results = fetch_data(stmt)
    puts_log "Results = #{results}"
  end

  if(@isAr3)
    return results
  else
    return ActiveRecord::Result.new(cols, results)
  end
end

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



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1522

def select_prepared(sql, name = nil, binds = [], prepare = true)
  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)
  if !/^select .*/i.match(sql).nil?
    cols = IBM_DB.resultCols(stmt)

    if( stmt )
      results = fetch_data(stmt)
    end

    puts_log "select_prepared columns = #{cols}"
    puts_log "select_prepared sql after = #{sql}"
    puts_log "select_prepared result = #{results}"
  else
    cols = nil
    result = nil
  end
  if(@isAr3)
    return results
  else
    return 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 2294

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 2254

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 966

def supports_comments?
  true
end

#supports_datetime_with_precision? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 943

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 951

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 2563

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 956

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 938

def supports_foreign_keys?
  puts_log "supports_foreign_keys?"
  true
end

#supports_lazy_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 961

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 933

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 980

def supports_partitioned_indexes?
  true
end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 970

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 1995

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 2640

def table_comment(table_name) # :nodoc:
  puts_log "table_comment"
  sql = "select remarks from syscat.tables where tabname = #{quote(table_name.upcase)}"
  single_value_from_rows(select_prepared(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 2687

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 2725

def table_options(table_name) # :nodoc:
  puts_log "table_options"
  if comment = table_comment(table_name)
    { comment: comment }
  end
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 2000

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 => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve table metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of table metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve tables metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during retrieval of table metadata')
    end
  end
  # Returns the tables array
  return tables
end

#to_sql(arel, binds = []) ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 917

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 1176

def translate_exception(exception, message:, sql:, binds:)
  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?
    RecordNotUnique.new(message, sql: sql, binds: binds)
		elsif !error_msg2.match(message).nil?
    ArgumentError.new(message)
		elsif !error_msg3.match(message).nil?
    RangeError.new(message, sql: sql, binds: binds)
  elsif !error_msg4.match(message).nil?
    NotNullViolation.new(message, sql: sql, binds: binds)
  elsif !error_msg5.match(message).nil? or !error_msg6.match(message).nil?
    InvalidForeignKey.new(message, sql: sql, binds: binds)
		elsif !error_msg7.match(message).nil? or !error_msg8.match(message).nil?
    ValueTooLong.new(message, sql: sql, binds: binds)
  elsif exception.message.match?(/called on a closed database/i)
    ConnectionNotEstablished.new(exception)
  else
    super
  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 1880

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

  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) === 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
    if limit.class == Hash
      if limit.has_key?("precision".to_sym)
        precision = limit[:precision]
      end
    end
    if limit.class == Hash
      if limit.has_key?("scale".to_sym)
        scale = limit[:scale]
      end
    end
    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})" if !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
      if limit.has_key?("limit".to_sym)
        limit1 = limit[:limit]
        sql_segment << "(#{limit1})"
      else
        return "vargraphic(1)"
      end
 else
   if limit != nil
        sql_segment << "(#{limit})"
      else
        return "vargraphic(1)"
      end
    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
      if limit.has_key?("limit".to_sym)
        limit1 = limit[:limit]
        sql_segment << "(#{limit1})"
      else
        return "graphic(1)"
      end
 else
      if limit != nil
        sql_segment << "(#{limit})"
      else
        return "graphic(1)"
      end
    end
    return sql_segment
  end

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

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

#unquoted_false ⇒ Object 



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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1755

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 1750

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 1622

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 = 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 1572

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.
  if 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
end

#valid_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1874

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 2704

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 2041

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 => fetch_error # Handle driver fetch errors
      error_msg = IBM_DB.getErrormsg(stmt, IBM_DB::DB_STMT )
      if error_msg && !error_msg.empty?
        raise "Failed to retrieve views metadata during fetch: #{error_msg}"
      else
        error_msg = "An unexpected error occurred during retrieval of views metadata"
        error_msg = error_msg + ": #{fetch_error.message}" if !fetch_error.message.empty?
        raise error_msg
      end
    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 )
    if error_msg && !error_msg.empty?
      raise "Failed to retrieve tables metadata due to error: #{error_msg}"
    else
      raise StandardError.new('An unexpected error occurred during retrieval of views metadata')
    end
  end
  # Returns the tables array
  return tables
end

#write_query?(sql) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1464

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