Module: Sequel::JDBC::Derby::DatabaseMethods

Includes:
Transactions
Defined in:
lib/sequel/adapters/jdbc/derby.rb

Instance Method Summary collapse

Methods included from Transactions

#supports_savepoints?, #supports_transaction_isolation_levels?

Instance Method Details

#cast_type_literal(type) ⇒ Object

Derby doesn't support casting integer to varchar, only integer to char, and char(254) appears to have the widest support (with char(255) failing). This does add a bunch of extra spaces at the end, but those will be trimmed elsewhere.


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# File 'lib/sequel/adapters/jdbc/derby.rb', line 24

def cast_type_literal(type)
  (type == String) ? 'CHAR(254)' : super
end

#database_typeObject


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# File 'lib/sequel/adapters/jdbc/derby.rb', line 28

def database_type
  :derby
end

#freezeObject


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# File 'lib/sequel/adapters/jdbc/derby.rb', line 32

def freeze
  svn_version
  super
end

#serial_primary_key_optionsObject

Derby uses an IDENTITY sequence for autoincrementing columns.


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# File 'lib/sequel/adapters/jdbc/derby.rb', line 38

def serial_primary_key_options
  {:primary_key => true, :type => :integer, :identity=>true, :start_with=>1}
end

#supports_transactional_ddl?Boolean

Derby supports transactional DDL statements.

Returns:

  • (Boolean)

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# File 'lib/sequel/adapters/jdbc/derby.rb', line 52

def supports_transactional_ddl?
  true
end

#svn_versionObject

The SVN version of the database.


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# File 'lib/sequel/adapters/jdbc/derby.rb', line 43

def svn_version
  @svn_version ||= begin
    v = synchronize{|c| c..get_database_product_version}
    v =~ /\((\d+)\)\z/
    $1.to_i
  end
end