Class: ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/oracle_enhanced_adapter.rb,
lib/active_record/connection_adapters/oracle_enhanced_database_tasks.rb,
lib/active_record/connection_adapters/oracle_enhanced_schema_creation.rb

Overview

Oracle enhanced adapter will work with both Ruby 1.8/1.9 ruby-oci8 gem (which provides interface to Oracle OCI client) or with JRuby and Oracle JDBC driver.

It should work with Oracle 9i, 10g and 11g databases. Limited set of functionality should work on Oracle 8i as well but several features rely on newer functionality in Oracle database.

Usage notes:

  • Key generation assumes a “$table_name_seq” sequence is available for all tables; the sequence name can be changed using ActiveRecord::Base.set_sequence_name. When using Migrations, these sequences are created automatically. Use set_sequence_name :autogenerated with legacy tables that have triggers that populate primary keys automatically.

  • Oracle uses DATE or TIMESTAMP datatypes for both dates and times. Consequently some hacks are employed to map data back to Date or Time in Ruby. Timezones and sub-second precision on timestamps are not supported.

  • Default values that are functions (such as “SYSDATE”) are not supported. This is a restriction of the way ActiveRecord supports default values.

Required parameters:

  • :username

  • :password

  • :database - either TNS alias or connection string for OCI client or database name in JDBC connection string

Optional parameters:

  • :host - host name for JDBC connection, defaults to “localhost”

  • :port - port number for JDBC connection, defaults to 1521

  • :privilege - set “SYSDBA” if you want to connect with this privilege

  • :allow_concurrency - set to “true” if non-blocking mode should be enabled (just for OCI client)

  • :prefetch_rows - how many rows should be fetched at one time to increase performance, defaults to 100

  • :cursor_sharing - cursor sharing mode to minimize amount of unique statements, defaults to “force”

  • :time_zone - database session time zone (it is recommended to set it using ENV which will be then also used for database session time zone)

Optionals NLS parameters:

  • :nls_calendar

  • :nls_comp

  • :nls_currency

  • :nls_date_format - format for :date columns, defaults to YYYY-MM-DD HH24:MI:SS

  • :nls_date_language

  • :nls_dual_currency

  • :nls_iso_currency

  • :nls_language

  • :nls_length_semantics - semantics of size of VARCHAR2 and CHAR columns, defaults to CHAR (meaning that size specifies number of characters and not bytes)

  • :nls_nchar_conv_excp

  • :nls_numeric_characters

  • :nls_sort

  • :nls_territory

  • :nls_timestamp_format - format for :timestamp columns, defaults to YYYY-MM-DD HH24:MI:SS:FF6

  • :nls_timestamp_tz_format

  • :nls_time_format

  • :nls_time_tz_format

Direct Known Subclasses

OracleAdapter

Defined Under Namespace

Classes: BindSubstitution, DatabaseTasks, SchemaCreation, StatementPool

Constant Summary collapse

ADAPTER_NAME = 
'OracleEnhanced'.freeze
NUMBER_MAX_PRECISION = 
38
DEFAULT_NLS_PARAMETERS =

:stopdoc:

{
  :nls_calendar            => nil,
  :nls_comp                => nil,
  :nls_currency            => nil,
  :nls_date_format         => 'YYYY-MM-DD HH24:MI:SS',
  :nls_date_language       => nil,
  :nls_dual_currency       => nil,
  :nls_iso_currency        => nil,
  :nls_language            => nil,
  :nls_length_semantics    => 'CHAR',
  :nls_nchar_conv_excp     => nil,
  :nls_numeric_characters  => nil,
  :nls_sort                => nil,
  :nls_territory           => nil,
  :nls_timestamp_format    => 'YYYY-MM-DD HH24:MI:SS:FF6',
  :nls_timestamp_tz_format => nil,
  :nls_time_format         => nil,
  :nls_time_tz_format      => nil
}
NATIVE_DATABASE_TYPES =

:stopdoc:

{
  :primary_key => "NUMBER(#{NUMBER_MAX_PRECISION}) NOT NULL PRIMARY KEY",
  :string      => { :name => "VARCHAR2", :limit => 255 },
  :text        => { :name => "CLOB" },
  :integer     => { :name => "NUMBER", :limit => NUMBER_MAX_PRECISION },
  :float       => { :name => "NUMBER" },
  :decimal     => { :name => "DECIMAL" },
  :datetime    => { :name => "DATE" },
  # changed to native TIMESTAMP type
  # :timestamp   => { :name => "DATE" },
  :timestamp   => { :name => "TIMESTAMP" },
  :time        => { :name => "DATE" },
  :date        => { :name => "DATE" },
  :binary      => { :name => "BLOB" },
  :boolean     => { :name => "NUMBER", :limit => 1 },
  :raw         => { :name => "RAW", :limit => 2000 }
}
NATIVE_DATABASE_TYPES_BOOLEAN_STRINGS =

if emulate_booleans_from_strings then store booleans in VARCHAR2

NATIVE_DATABASE_TYPES.dup.merge(
  :boolean     => { :name => "VARCHAR2", :limit => 1 }
)
IDENTIFIER_MAX_LENGTH =

maximum length of Oracle identifiers

30
NONQUOTED_OBJECT_NAME =

Names must be from 1 to 30 bytes long with these exceptions:

  • Names of databases are limited to 8 bytes.

  • Names of database links can be as long as 128 bytes.

Nonquoted identifiers cannot be Oracle Database reserved words

Nonquoted identifiers must begin with an alphabetic character from your database character set

Nonquoted identifiers can contain only alphanumeric characters from your database character set and the underscore (_), dollar sign ($), and pound sign (#). Database links can also contain periods (.) and “at” signs (@). Oracle strongly discourages you from using $ and # in nonquoted identifiers.

/[A-Za-z][A-z0-9$#]{0,29}/
/[A-Za-z][A-z0-9$#\.@]{0,127}/
VALID_TABLE_NAME = 
/\A(?:#{NONQUOTED_OBJECT_NAME}\.)?#{NONQUOTED_OBJECT_NAME}(?:@#{NONQUOTED_DATABASE_LINK})?\Z/
AUTOGENERATED_SEQUENCE_NAME =

use in set_sequence_name to avoid fetching primary key value from sequence

'autogenerated'.freeze
DBMS_OUTPUT_BUFFER_SIZE =

Maximum DBMS_OUTPUT buffer size

10000
VERSION = 
File.read(File.expand_path('../../../../VERSION', __FILE__)).chomp
@@do_not_prefetch_primary_key = 
{}
@@ignore_table_columns =

:nodoc:

nil
@@table_column_type =

:nodoc:

nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, logger, config) ⇒ OracleEnhancedAdapter

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 390

def initialize(connection, logger, config) #:nodoc:
  super(connection, logger)
  @quoted_column_names, @quoted_table_names = {}, {}
  @config = config
  @statements = StatementPool.new(connection, config.fetch(:statement_limit) { 250 })
  @enable_dbms_output = false
  if config.fetch(:prepared_statements) { true }
    @visitor = Arel::Visitors::Oracle.new self
    @prepared_statements = true
  else
    @visitor = unprepared_visitor
  end
end

Instance Attribute Details

#auto_retry ⇒ Object

If SQL statement fails due to lost connection then reconnect and retry SQL statement if autocommit mode is enabled. By default this functionality is disabled.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 695

def auto_retry
  @auto_retry
end

Class Method Details

.boolean_to_string(bool) ⇒ Object

How boolean value should be quoted to String. Used if emulate_booleans_from_strings option is set to true.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 336

def self.boolean_to_string(bool)
  bool ? "Y" : "N"
end

.encode_raw(value) ⇒ Object

Encode a string or byte array as string of hex codes



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 651

def self.encode_raw(value)
  # When given a string, convert to a byte array.
  value = value.unpack('C*') if value.is_a?(String)
  value.map { |x| "%02X" % x }.join
end

.is_boolean_column?(name, field_type, table_name = nil) ⇒ Boolean

Check column name to identify if it is boolean (and not String) column. Is used if emulate_booleans_from_strings option is set to true. Override this method definition in initializer file if different boolean column recognition is needed.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 329

def self.is_boolean_column?(name, field_type, table_name = nil)
  return true if ["CHAR(1)","VARCHAR2(1)"].include?(field_type)
  field_type =~ /^VARCHAR2/ && (name =~ /_flag$/i || name =~ /_yn$/i)
end

.is_date_column?(name, table_name = nil) ⇒ Boolean

Check column name to identify if it is Date (and not Time) column. Is used if emulate_dates_by_column_name option is set to true. Override this method definition in initializer file if different Date column recognition is needed.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 283

def self.is_date_column?(name, table_name = nil)
  name =~ /(^|_)date(_|$)/i
end

.is_integer_column?(name, table_name = nil) ⇒ Boolean

Check column name to identify if it is Integer (and not Float or BigDecimal) column. Is used if emulate_integers_by_column_name option is set to true. Override this method definition in initializer file if different Integer column recognition is needed.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 313

def self.is_integer_column?(name, table_name = nil)
  !!(name =~ /(^|_)id$/i)
end

.valid_table_name?(name) ⇒ Boolean

unescaped table name should start with letter and contain letters, digits, _, $ or # can be prefixed with schema name CamelCase table names should be quoted

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 589

def self.valid_table_name?(name) #:nodoc:
  name = name.to_s
  name =~ VALID_TABLE_NAME && !(name =~ /[A-Z]/ && name =~ /[a-z]/) ? true : false
end

Instance Method Details

#active? ⇒ Boolean

Returns true if the connection is active.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 709

def active? #:nodoc:
  # Pings the connection to check if it's still good. Note that an
  # #active? method is also available, but that simply returns the
  # last known state, which isn't good enough if the connection has
  # gone stale since the last use.
  @connection.ping
rescue OracleEnhancedConnectionException
  false
end

#adapter_name ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 406

def adapter_name #:nodoc:
  ADAPTER_NAME
end

#allowed_index_name_length ⇒ Object

Returns the maximum allowed length for an index name. This limit is enforced by rails and Is less than or equal to index_name_length. The gap between index_name_length is to allow internal rails opreations to use prefixes in temporary opreations.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 499

def allowed_index_name_length
  index_name_length
end

#cache_columns ⇒ Object

:singleton-method: Cache column description between requests. Could be used in development environment to avoid selecting table columns from data dictionary tables for each request. This can speed up request processing in development mode if development database is not on local computer.

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.cache_columns = true



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1002

cattr_accessor :cache_columns

#clear_columns_cache ⇒ Object

used just in tests to clear column cache



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1077

def clear_columns_cache #:nodoc:
  @@columns_cache = nil
  @@pk_and_sequence_for_cache = nil
end

#clear_ignored_table_columns ⇒ Object

used just in tests to clear ignored table columns



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 954

def clear_ignored_table_columns #:nodoc:
  @@ignore_table_columns = nil
end

#clear_prefetch_primary_key ⇒ Object

used just in tests to clear prefetch primary key flag for all tables



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 769

def clear_prefetch_primary_key #:nodoc:
  @@do_not_prefetch_primary_key = {}
end

#clear_table_columns_cache(table_name) ⇒ Object

used in migrations to clear column cache for specified table



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1083

def clear_table_columns_cache(table_name)
  if @@cache_columns
    @@columns_cache ||= {}
    @@columns_cache[table_name.to_s] = nil
  end
end

#clear_types_for_columns ⇒ Object

used just in tests to clear column data type definitions



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

def clear_types_for_columns #:nodoc:
  @@table_column_type = nil
end

#column_name_length ⇒ Object

the maximum length of a column name



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 490

def column_name_length
  IDENTIFIER_MAX_LENGTH
end

#columns(table_name, name = nil) ⇒ Object

:nodoc:



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

def columns(table_name, name = nil) #:nodoc:
  if @@cache_columns
    @@columns_cache ||= {}
    @@columns_cache[table_name] ||= columns_without_cache(table_name, name)
  else
    columns_without_cache(table_name, name)
  end
end

#columns_for_distinct(columns, orders) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1176

def columns_for_distinct(columns, orders) #:nodoc:
  # construct a valid columns name for DISTINCT clause,
  # ie. one that includes the ORDER BY columns, using FIRST_VALUE such that
  # the inclusion of these columns doesn't invalidate the DISTINCT
  #
  # It does not construct DISTINCT clause. Just return column names for distinct.
  order_columns = orders.reject(&:blank?).map{ |s|
    s = s.to_sql unless s.is_a?(String)
    # remove any ASC/DESC modifiers
    s.gsub(/\s+(ASC|DESC)\s*?/i, '')
    }.reject(&:blank?).map.with_index { |column,i|
      "FIRST_VALUE(#{column}) OVER (PARTITION BY #{columns} ORDER BY #{column}) AS alias_#{i}__"
    }
    [super, *order_columns].join(', ')
end

#columns_without_cache(table_name, name = nil) ⇒ Object

:nodoc:



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

def columns_without_cache(table_name, name = nil) #:nodoc:
  table_name = table_name.to_s
  # get ignored_columns by original table name
  ignored_columns = ignored_table_columns(table_name)

  (owner, desc_table_name, db_link) = @connection.describe(table_name)

  # reset do_not_prefetch_primary_key cache for this table
  @@do_not_prefetch_primary_key[table_name] = nil

  table_cols = <<-SQL.strip.gsub(/\s+/, ' ')
    SELECT column_name AS name, data_type AS sql_type, data_default, nullable, virtual_column, hidden_column, data_type_owner AS sql_type_owner,
           DECODE(data_type, 'NUMBER', data_precision,
                             'FLOAT', data_precision,
                             'VARCHAR2', DECODE(char_used, 'C', char_length, data_length),
                             'RAW', DECODE(char_used, 'C', char_length, data_length),
                             'CHAR', DECODE(char_used, 'C', char_length, data_length),
                              NULL) AS limit,
           DECODE(data_type, 'NUMBER', data_scale, NULL) AS scale
      FROM all_tab_cols#{db_link}
     WHERE owner      = '#{owner}'
       AND table_name = '#{desc_table_name}'
       AND hidden_column = 'NO'
     ORDER BY column_id
  SQL

  # added deletion of ignored columns
  select_all(table_cols, name).to_a.delete_if do |row|
    ignored_columns && ignored_columns.include?(row['name'].downcase)
  end.map do |row|
    limit, scale = row['limit'], row['scale']
    if limit || scale
      row['sql_type'] += "(#{(limit || NUMBER_MAX_PRECISION).to_i}" + ((scale = scale.to_i) > 0 ? ",#{scale})" : ")")
    end

    if row['sql_type_owner']
      row['sql_type'] = row['sql_type_owner'] + '.' + row['sql_type']
    end

    is_virtual = row['virtual_column']=='YES'

    # clean up odd default spacing from Oracle
    if row['data_default'] && !is_virtual
      row['data_default'].sub!(/^(.*?)\s*$/, '\1')

      # If a default contains a newline these cleanup regexes need to
      # match newlines.
      row['data_default'].sub!(/^'(.*)'$/m, '\1')
      row['data_default'] = nil if row['data_default'] =~ /^(null|empty_[bc]lob\(\))$/i
    end

    OracleEnhancedColumn.new(oracle_downcase(row['name']),
                     row['data_default'],
                     row['sql_type'],
                     row['nullable'] == 'Y',
                     # pass table name for table specific column definitions
                     table_name,
                     # pass column type if specified in class definition
                     get_type_for_column(table_name, oracle_downcase(row['name'])), is_virtual)
  end
end

#current_database ⇒ Object

Current database name



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 829

def current_database
  select_value("SELECT SYS_CONTEXT('userenv', 'db_name') FROM dual")
end

#current_schema ⇒ Object

Current database session schema



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 839

def current_schema
  select_value("SELECT SYS_CONTEXT('userenv', 'current_schema') FROM dual")
end

#current_user ⇒ Object

Current database session user



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 834

def current_user
  select_value("SELECT SYS_CONTEXT('userenv', 'session_user') FROM dual")
end

#dbms_output_enabled? ⇒ Boolean

Is DBMS_Output logging enabled?

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1259

def dbms_output_enabled?
  @enable_dbms_output
end

#default_sequence_start_value ⇒ Object

:singleton-method: Specify default sequence start with value (by default 10000 if not explicitly set), e.g.:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.default_sequence_start_value = 1



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1095

cattr_accessor :default_sequence_start_value

#default_tablespace ⇒ Object

Default tablespace name of current user



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 844

def default_tablespace
  select_value("SELECT LOWER(default_tablespace) FROM user_users WHERE username = SYS_CONTEXT('userenv', 'current_schema')")
end

#disable_dbms_output ⇒ Object

Turn DBMS_Output logging off



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1253

def disable_dbms_output
  set_dbms_output_plsql_connection
  @enable_dbms_output = false
  plsql(:dbms_output).sys.dbms_output.disable
end

#disconnect! ⇒ Object

Disconnects from the database.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 733

def disconnect! #:nodoc:
  super
  @connection.logoff rescue nil
end

#distinct(columns, orders) ⇒ Object

SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.

Oracle requires the ORDER BY columns to be in the SELECT list for DISTINCT queries. However, with those columns included in the SELECT DISTINCT list, you won’t actually get a distinct list of the column you want (presuming the column has duplicates with multiple values for the ordered-by columns. So we use the FIRST_VALUE function to get a single (first) value for each column, effectively making every row the same.

distinct("posts.id", "posts.created_at desc")



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1159

def distinct(columns, orders) #:nodoc:
  # To support Rails 4.0.0 and future releases
  # because `columns_for_distinct method introduced after Rails 4.0.0 released
  if super.respond_to?(:columns_for_distinct)
    super
  else
    order_columns = orders.map { |c|
      c = c.to_sql unless c.is_a?(String)
      # remove any ASC/DESC modifiers
      c.gsub(/\s+(ASC|DESC)\s*?/i, '')
      }.reject(&:blank?).map.with_index { |c,i|
        "FIRST_VALUE(#{c}) OVER (PARTITION BY #{columns} ORDER BY #{c}) AS alias_#{i}__"
      }
      [super].concat(order_columns).join(', ')
  end
end

#emulate_booleans ⇒ Object

:singleton-method: By default, the OracleEnhancedAdapter will consider all columns of type NUMBER(1) as boolean. If you wish to disable this emulation you can add the following line to your initializer file:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.emulate_booleans = false



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 229

cattr_accessor :emulate_booleans

#emulate_booleans_from_strings ⇒ Object

:singleton-method: If you wish that CHAR(1), VARCHAR2(1) columns or VARCHAR2 columns with FLAG or YN at the end of their name are typecasted to booleans then you can add the following line to your initializer file:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.emulate_booleans_from_strings = true



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 323

cattr_accessor :emulate_booleans_from_strings

#emulate_dates ⇒ Object

:singleton-method: By default, the OracleEnhancedAdapter will typecast all columns of type DATE to Time or DateTime (if value is out of Time value range) value. If you wish that DATE values with hour, minutes and seconds equal to 0 are typecasted to Date then you can add the following line to your initializer file:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.emulate_dates = true

As this option can have side effects when unnecessary typecasting is done it is recommended that Date columns are explicily defined with set_date_columns method.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 243

cattr_accessor :emulate_dates

#emulate_dates_by_column_name ⇒ Object

:singleton-method: By default, the OracleEnhancedAdapter will typecast all columns of type DATE to Time or DateTime (if value is out of Time value range) value. If you wish that DATE columns with “date” in their name (e.g. “creation_date”) are typecasted to Date then you can add the following line to your initializer file:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.emulate_dates_by_column_name = true

As this option can have side effects when unnecessary typecasting is done it is recommended that Date columns are explicily defined with set_date_columns method.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 270

cattr_accessor :emulate_dates_by_column_name

#emulate_integers_by_column_name ⇒ Object

:singleton-method: By default, the OracleEnhancedAdapter will typecast all columns of type NUMBER (without precision or scale) to Float or BigDecimal value. If you wish that NUMBER columns with name “id” or that end with “_id” are typecasted to Integer then you can add the following line to your initializer file:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.emulate_integers_by_column_name = true



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 307

cattr_accessor :emulate_integers_by_column_name

#enable_dbms_output ⇒ Object

Turn DBMS_Output logging on



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1247

def enable_dbms_output
  set_dbms_output_plsql_connection
  @enable_dbms_output = true
  plsql(:dbms_output).sys.dbms_output.enable(DBMS_OUTPUT_BUFFER_SIZE)
end

#get_type_for_column(table_name, column_name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 969

def get_type_for_column(table_name, column_name) #:nodoc:
  @@table_column_type && @@table_column_type[table_name] && @@table_column_type[table_name][column_name.to_s.downcase]
end

#has_primary_key?(table_name, owner = nil, desc_table_name = nil, db_link = nil) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1145

def has_primary_key?(table_name, owner=nil, desc_table_name=nil, db_link=nil) #:nodoc:
  !pk_and_sequence_for(table_name, owner, desc_table_name, db_link).nil?
end

#has_primary_key_trigger?(table_name, owner = nil, desc_table_name = nil, db_link = nil) ⇒ Boolean

check if table has primary key trigger with _pkt suffix

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 979

def has_primary_key_trigger?(table_name, owner = nil, desc_table_name = nil, db_link = nil)
  (owner, desc_table_name, db_link) = @connection.describe(table_name) unless owner

  trigger_name = default_trigger_name(table_name).upcase
  pkt_sql = <<-SQL
    SELECT trigger_name
    FROM all_triggers#{db_link}
    WHERE owner = '#{owner}'
      AND trigger_name = '#{trigger_name}'
      AND table_owner = '#{owner}'
      AND table_name = '#{desc_table_name}'
      AND status = 'ENABLED'
  SQL
  select_value(pkt_sql, 'Primary Key Trigger') ? true : false
end

#ignore_table_columns(table_name, *args) ⇒ Object

set ignored columns for table



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 941

def ignore_table_columns(table_name, *args) #:nodoc:
  @@ignore_table_columns ||= {}
  @@ignore_table_columns[table_name] ||= []
  @@ignore_table_columns[table_name] += args.map{|a| a.to_s.downcase}
  @@ignore_table_columns[table_name].uniq!
end

#ignored_table_columns(table_name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 948

def ignored_table_columns(table_name) #:nodoc:
  @@ignore_table_columns ||= {}
  @@ignore_table_columns[table_name]
end

#in_clause_length ⇒ Object Also known as: ids_in_list_limit

To avoid ORA-01795: maximum number of expressions in a list is 1000 tell ActiveRecord to limit us to 1000 ids at a time



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 516

def in_clause_length
  1000
end

#index_name_length ⇒ Object

the maximum length of an index name supported by this database



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 505

def index_name_length
  IDENTIFIER_MAX_LENGTH
end

#indexes(table_name, name = nil) ⇒ Object

This method selects all indexes at once, and caches them in a class variable. Subsequent index calls get them from the variable, without going to the DB.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 870

def indexes(table_name, name = nil) #:nodoc:
  (owner, table_name, db_link) = @connection.describe(table_name)
  unless all_schema_indexes
    default_tablespace_name = default_tablespace
    result = select_all(<<-SQL.strip.gsub(/\s+/, ' '))
      SELECT LOWER(i.table_name) AS table_name, LOWER(i.index_name) AS index_name, i.uniqueness,
        i.index_type, i.ityp_owner, i.ityp_name, i.parameters,
        LOWER(i.tablespace_name) AS tablespace_name,
        LOWER(c.column_name) AS column_name, e.column_expression,
        atc.virtual_column
      FROM all_indexes#{db_link} i
        JOIN all_ind_columns#{db_link} c ON c.index_name = i.index_name AND c.index_owner = i.owner
        LEFT OUTER JOIN all_ind_expressions#{db_link} e ON e.index_name = i.index_name AND
          e.index_owner = i.owner AND e.column_position = c.column_position
        LEFT OUTER JOIN all_tab_cols#{db_link} atc ON i.table_name = atc.table_name AND
          c.column_name = atc.column_name AND i.owner = atc.owner AND atc.hidden_column = 'NO'
      WHERE i.owner = '#{owner}'
         AND i.table_owner = '#{owner}'
         AND NOT EXISTS (SELECT uc.index_name FROM all_constraints uc
          WHERE uc.index_name = i.index_name AND uc.owner = i.owner AND uc.constraint_type = 'P')
      ORDER BY i.index_name, c.column_position
    SQL

    current_index = nil
    self.all_schema_indexes = []

    result.each do |row|
      # have to keep track of indexes because above query returns dups
      # there is probably a better query we could figure out
      if current_index != row['index_name']
        statement_parameters = nil
        if row['index_type'] == 'DOMAIN' && row['ityp_owner'] == 'CTXSYS' && row['ityp_name'] == 'CONTEXT'
          procedure_name = default_datastore_procedure(row['index_name'])
          source = select_values(<<-SQL).join
            SELECT text
            FROM all_source#{db_link}
            WHERE owner = '#{owner}'
              AND name = '#{procedure_name.upcase}'
            ORDER BY line
          SQL
          if source =~ /-- add_context_index_parameters (.+)\n/
            statement_parameters = $1
          end
        end
        all_schema_indexes << OracleEnhancedIndexDefinition.new(row['table_name'], row['index_name'],
          row['uniqueness'] == "UNIQUE", row['index_type'] == 'DOMAIN' ? "#{row['ityp_owner']}.#{row['ityp_name']}" : nil,
          row['parameters'], statement_parameters,
          row['tablespace_name'] == default_tablespace_name ? nil : row['tablespace_name'], [])
        current_index = row['index_name']
      end

      # Functional index columns and virtual columns both get stored as column expressions,
      # but re-creating a virtual column index as an expression (instead of using the virtual column's name)
      # results in a ORA-54018 error.  Thus, we only want the column expression value returned
      # when the column is not virtual.
      if row['column_expression'] && row['virtual_column'] != 'YES'
        all_schema_indexes.last.columns << row['column_expression']
      else
        all_schema_indexes.last.columns << row['column_name'].downcase
      end
    end
  end

  # Return the indexes just for the requested table, since AR is structured that way
  table_name = table_name.downcase
  all_schema_indexes.select{|i| i.table == table_name}
end

#is_date_column?(name, table_name = nil) ⇒ Boolean

instance method uses at first check if column type defined at class level

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 288

def is_date_column?(name, table_name = nil) #:nodoc:
  case get_type_for_column(table_name, name)
  when nil
    self.class.is_date_column?(name, table_name)
  when :date
    true
  else
    false
  end
end

#join_to_update(update, select) ⇒ Object

construct additional wrapper subquery if select.offset is used to avoid generation of invalid subquery … IN ( SELECT * FROM ( SELECT raw_sql_.*, rownum raw_rnum_ FROM ( … ) raw_sql_ ) WHERE raw_rnum_ > … )



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1198

def join_to_update(update, select) #:nodoc:
  if select.offset
    subsubselect = select.clone
    subsubselect.projections = [update.key]

    subselect = Arel::SelectManager.new(select.engine)
    subselect.project Arel.sql(quote_column_name update.key.name)
    subselect.from subsubselect.as('alias_join_to_update')

    update.where update.key.in(subselect)
  else
    super
  end
end

#materialized_views ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 862

def materialized_views #:nodoc:
  select_values("SELECT LOWER(mview_name) FROM all_mviews WHERE owner = SYS_CONTEXT('userenv', 'current_schema')")
end

#native_database_types ⇒ Object

:startdoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 473

def native_database_types #:nodoc:
  emulate_booleans_from_strings ? NATIVE_DATABASE_TYPES_BOOLEAN_STRINGS : NATIVE_DATABASE_TYPES
end

#next_sequence_value(sequence_name) ⇒ Object

Returns the next sequence value from a sequence generator. Not generally called directly; used by ActiveRecord to get the next primary key value when inserting a new database record (see #prefetch_primary_key?).



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 744

def next_sequence_value(sequence_name)
  # if sequence_name is set to :autogenerated then it means that primary key will be populated by trigger
  return nil if sequence_name == AUTOGENERATED_SEQUENCE_NAME
  # call directly connection method to avoid prepared statement which causes fetching of next sequence value twice
  @connection.select_value("SELECT #{quote_table_name(sequence_name)}.NEXTVAL FROM dual")
end

#number_datatype_coercion ⇒ Object

:singleton-method: Specify how ‘NUMBER` datatype columns, without precision and scale, are handled in Rails world. Default is :decimal and other valid option is :float. Be wary of setting it to other values.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 277

cattr_accessor :number_datatype_coercion

#pk_and_sequence_for(table_name, owner = nil, desc_table_name = nil, db_link = nil) ⇒ Object

Find a table’s primary key and sequence. Note: Only primary key is implemented - sequence will be nil.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1100

def pk_and_sequence_for(table_name, owner=nil, desc_table_name=nil, db_link=nil) #:nodoc:
  if @@cache_columns
    @@pk_and_sequence_for_cache ||= {}
    if @@pk_and_sequence_for_cache.key?(table_name)
      @@pk_and_sequence_for_cache[table_name]
    else
      @@pk_and_sequence_for_cache[table_name] = pk_and_sequence_for_without_cache(table_name, owner, desc_table_name, db_link)
    end
  else
    pk_and_sequence_for_without_cache(table_name, owner, desc_table_name, db_link)
  end
end

#pk_and_sequence_for_without_cache(table_name, owner = nil, desc_table_name = nil, db_link = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1113

def pk_and_sequence_for_without_cache(table_name, owner=nil, desc_table_name=nil, db_link=nil) #:nodoc:
  (owner, desc_table_name, db_link) = @connection.describe(table_name) unless owner

  seqs = select_values(<<-SQL.strip.gsub(/\s+/, ' '), 'Sequence')
    select us.sequence_name
    from all_sequences#{db_link} us
    where us.sequence_owner = '#{owner}'
    and us.sequence_name = '#{desc_table_name}_SEQ'
  SQL

  # changed back from user_constraints to all_constraints for consistency
  pks = select_values(<<-SQL.strip.gsub(/\s+/, ' '), 'Primary Key')
    SELECT cc.column_name
      FROM all_constraints#{db_link} c, all_cons_columns#{db_link} cc
     WHERE c.owner = '#{owner}'
       AND c.table_name = '#{desc_table_name}'
       AND c.constraint_type = 'P'
       AND cc.owner = c.owner
       AND cc.constraint_name = c.constraint_name
  SQL

  # only support single column keys
  pks.size == 1 ? [oracle_downcase(pks.first),
                   oracle_downcase(seqs.first)] : nil
end

#prefetch_primary_key?(table_name = nil) ⇒ Boolean

Returns true for Oracle adapter (since Oracle requires primary key values to be pre-fetched before insert). See also #next_sequence_value.

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 755

def prefetch_primary_key?(table_name = nil)
  return true if table_name.nil?
  table_name = table_name.to_s
  do_not_prefetch = @@do_not_prefetch_primary_key[table_name]
  if do_not_prefetch.nil?
    owner, desc_table_name, db_link = @connection.describe(table_name)
    @@do_not_prefetch_primary_key[table_name] = do_not_prefetch =
      !has_primary_key?(table_name, owner, desc_table_name, db_link) ||
      has_primary_key_trigger?(table_name, owner, desc_table_name, db_link)
  end
  !do_not_prefetch
end

#primary_key(table_name) ⇒ Object

Returns just a table’s primary key



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1140

def primary_key(table_name)
  pk_and_sequence = pk_and_sequence_for(table_name)
  pk_and_sequence && pk_and_sequence.first
end

#quote(value, column = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 603

def quote(value, column = nil) #:nodoc:
  if value && column
    case column.type
    when :text, :binary
      %Q{empty_#{ type_to_sql(column.type.to_sym).downcase rescue 'blob' }()}
    # NLS_DATE_FORMAT independent TIMESTAMP support
    when :timestamp
      quote_timestamp_with_to_timestamp(value)
    # NLS_DATE_FORMAT independent DATE support
    when :date, :time, :datetime
      quote_date_with_to_date(value)
    when :raw
      quote_raw(value)
    when :string
      # NCHAR and NVARCHAR2 literals should be quoted with N'...'.
      # Read directly instance variable as otherwise migrations with table column default values are failing
      # as migrations pass ColumnDefinition object to this method.
      # Check if instance variable is defined to avoid warnings about accessing undefined instance variable.
      column.instance_variable_defined?('@nchar') && column.instance_variable_get('@nchar') ? 'N' << super : super
    else
      super
    end
  elsif value.acts_like?(:date)
    quote_date_with_to_date(value)
  elsif value.acts_like?(:time)
    value.to_i == value.to_f ? quote_date_with_to_date(value) : quote_timestamp_with_to_timestamp(value)
  else
    super
  end
end

#quote_column_name(name) ⇒ Object

QUOTING ==================================================

see: abstract/quoting.rb



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 525

def quote_column_name(name) #:nodoc:
  name = name.to_s
  @quoted_column_names[name] ||= begin
    # if only valid lowercase column characters in name
    if name =~ /\A[a-z][a-z_0-9\$#]*\Z/
      "\"#{name.upcase}\""
    else
      # remove double quotes which cannot be used inside quoted identifier
      "\"#{name.gsub('"', '')}\""
    end
  end
end

#quote_column_name_or_expression(name) ⇒ Object

This method is used in add_index to identify either column name (which is quoted) or function based index (in which case function expression is not quoted)



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 540

def quote_column_name_or_expression(name) #:nodoc:
  name = name.to_s
  case name
  # if only valid lowercase column characters in name
  when /^[a-z][a-z_0-9\$#]*$/
    "\"#{name.upcase}\""
  when /^[a-z][a-z_0-9\$#\-]*$/i
    "\"#{name}\""
  # if other characters present then assume that it is expression
  # which should not be quoted
  else
    name
  end
end

#quote_database_link(name) ⇒ Object

Used only for quoting database links as the naming rules for links differ from the rules for column names. Specifically, link names may include periods.



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 558

def quote_database_link(name)
  case name
  when NONQUOTED_DATABASE_LINK
    %Q("#{name.upcase}")
  else
    name
  end
end

#quote_date_with_to_date(value) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 644

def quote_date_with_to_date(value) #:nodoc:
  # should support that composite_primary_keys gem will pass date as string
  value = quoted_date(value) if value.acts_like?(:date) || value.acts_like?(:time)
  "TO_DATE('#{value}','YYYY-MM-DD HH24:MI:SS')"
end

#quote_raw(value) ⇒ Object

quote encoded raw value



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

def quote_raw(value) #:nodoc:
  "'#{self.class.encode_raw(value)}'"
end

#quote_string(s) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 599

def quote_string(s) #:nodoc:
  s.gsub(/'/, "''")
end

#quote_table_name(name) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 594

def quote_table_name(name) #:nodoc:
  name, link = name.to_s.split('@')
  @quoted_table_names[name] ||= [name.split('.').map{|n| quote_column_name(n)}.join('.'), quote_database_link(link)].compact.join('@')
end

#quote_timestamp_with_to_timestamp(value) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 662

def quote_timestamp_with_to_timestamp(value) #:nodoc:
  # add up to 9 digits of fractional seconds to inserted time
  value = "#{quoted_date(value)}:#{("%.6f"%value.to_f).split('.')[1]}" if value.acts_like?(:time)
  "TO_TIMESTAMP('#{value}','YYYY-MM-DD HH24:MI:SS:FF6')"
end

#quoted_false ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 639

def quoted_false #:nodoc:
  return "'#{self.class.boolean_to_string(false)}'" if emulate_booleans_from_strings
  "0"
end

#quoted_true ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 634

def quoted_true #:nodoc:
  return "'#{self.class.boolean_to_string(true)}'" if emulate_booleans_from_strings
  "1"
end

#raw_connection ⇒ Object

return raw OCI8 or JDBC connection



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 704

def raw_connection
  @connection.raw_connection
end

#reconnect! ⇒ Object

Reconnects to the database.



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

def reconnect! #:nodoc:
  super
  @connection.reset!
rescue OracleEnhancedConnectionException => e
  @logger.warn "#{adapter_name} automatic reconnection failed: #{e.message}" if @logger
end

#reset! ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 727

def reset!
  clear_cache!
  super
end

#reset_pk_sequence!(table_name, primary_key = nil, sequence_name = nil) ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 773

def reset_pk_sequence!(table_name, primary_key = nil, sequence_name = nil) #:nodoc:
  return nil unless table_exists?(table_name)
  unless primary_key and sequence_name
  # *Note*: Only primary key is implemented - sequence will be nil.
    primary_key, sequence_name = pk_and_sequence_for(table_name)
    # TODO This sequence_name implemantation is just enough
    # to satisty fixures. To get correct sequence_name always
    # pk_and_sequence_for method needs some work.
    begin
      sequence_name = table_name.classify.constantize.sequence_name
    rescue
      sequence_name = default_sequence_name(table_name)
    end
  end

  if @logger && primary_key && !sequence_name
    @logger.warn "#{table_name} has primary key #{primary_key} with no default sequence"
  end

  if primary_key && sequence_name
    new_start_value = select_value("
      select NVL(max(#{quote_column_name(primary_key)}),0) + 1 from #{quote_table_name(table_name)}
    ", new_start_value)

    execute ("DROP SEQUENCE #{quote_table_name(sequence_name)}")
    execute ("CREATE SEQUENCE #{quote_table_name(sequence_name)} START WITH #{new_start_value}")
  end
end

#schema_creation ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_schema_creation.rb', line 83

def schema_creation
    SchemaCreation.new self
end

#sequence_name_length ⇒ Object

the maximum length of a sequence name



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 510

def sequence_name_length
  IDENTIFIER_MAX_LENGTH
end

#set_type_for_columns(table_name, column_type, *args) ⇒ Object

set explicit type for specified table columns



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

def set_type_for_columns(table_name, column_type, *args) #:nodoc:
  @@table_column_type ||= {}
  @@table_column_type[table_name] ||= {}
  args.each do |col|
    @@table_column_type[table_name][col.to_s.downcase] = column_type
  end
end

#string_to_date_format ⇒ Object

:singleton-method: Specify non-default date format that should be used when assigning string values to :date columns, e.g.:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.string_to_date_format = “%d.%m.%Y”



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 345

cattr_accessor :string_to_date_format

#string_to_time_format ⇒ Object

:singleton-method: Specify non-default time format that should be used when assigning string values to :datetime columns, e.g.:

ActiveRecord::ConnectionAdapters::OracleEnhancedAdapter.string_to_time_format = “%d.%m.%Y %H:%M:%S”



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 353

cattr_accessor :string_to_time_format

#supports_migrations? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 410

def supports_migrations? #:nodoc:
  true
end

#supports_primary_key? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 414

def supports_primary_key? #:nodoc:
  true
end

#supports_savepoints? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 418

def supports_savepoints? #:nodoc:
  true
end

#supports_transaction_isolation? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 422

def supports_transaction_isolation? #:nodoc:
  true
end

#table_alias_length ⇒ Object

:nodoc:



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 480

def table_alias_length #:nodoc:
  IDENTIFIER_MAX_LENGTH
end

#table_exists?(table_name) ⇒ Boolean

Will return true if database object exists (to be able to use also views and synonyms for ActiveRecord models)

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 855

def table_exists?(table_name)
  (owner, table_name, db_link) = @connection.describe(table_name)
  true
rescue
  false
end

#table_name_length ⇒ Object

the maximum length of a table name



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 485

def table_name_length
  IDENTIFIER_MAX_LENGTH
end

#tables(name = nil) ⇒ Object

:nodoc:



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

def tables(name = nil) #:nodoc:
  select_values(
  "SELECT DECODE(table_name, UPPER(table_name), LOWER(table_name), table_name) FROM all_tables WHERE owner = SYS_CONTEXT('userenv', 'current_schema') AND secondary = 'N'",
  name)
end

#temporary_table?(table_name) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 1192

def temporary_table?(table_name) #:nodoc:
  select_value("SELECT temporary FROM user_tables WHERE table_name = '#{table_name.upcase}'") == 'Y'
end

#type_cast(value, column) ⇒ Object

Cast a value to a type that the database understands.



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

def type_cast(value, column)
  case value
  when true, false
    if emulate_booleans_from_strings || column && column.type == :string
      self.class.boolean_to_string(value)
    else
      value ? 1 : 0
    end
  when Date, Time
    if value.acts_like?(:time)
      zone_conversion_method = ActiveRecord::Base.default_timezone == :utc ? :getutc : :getlocal
      value.respond_to?(zone_conversion_method) ? value.send(zone_conversion_method) : value
    else
      value
    end
  else
    super
  end
end

#write_lobs(table_name, klass, attributes, columns) ⇒ Object

Writes LOB values from attributes for specified columns



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 803

def write_lobs(table_name, klass, attributes, columns) #:nodoc:
  # is class with composite primary key>
  is_with_cpk = klass.respond_to?(:composite?) && klass.composite?
  if is_with_cpk
    id = klass.primary_key.map {|pk| attributes[pk.to_s] }
  else
    id = quote(attributes[klass.primary_key])
  end
  columns.each do |col|
    value = attributes[col.name]
    # changed sequence of next two lines - should check if value is nil before converting to yaml
    next if value.nil?  || (value == '')
    value = value.to_yaml if col.text? && klass.serialized_attributes[col.name]
    uncached do
      sql = is_with_cpk ? "SELECT #{quote_column_name(col.name)} FROM #{quote_table_name(table_name)} WHERE #{klass.composite_where_clause(id)} FOR UPDATE" :
        "SELECT #{quote_column_name(col.name)} FROM #{quote_table_name(table_name)} WHERE #{quote_column_name(klass.primary_key)} = #{id} FOR UPDATE"
      unless lob_record = select_one(sql, 'Writable Large Object')
        raise ActiveRecord::RecordNotFound, "statement #{sql} returned no rows"
      end
      lob = lob_record[col.name]
      @connection.write_lob(lob, value.to_s, col.type == :binary)
    end
  end
end