Module: OracleEnhancedAdapterConstraintsMethods

Defined in:
lib/active_record/connection_adapters/oracle_enhanced_adapter.rb

Instance Method Summary collapse

Instance Method Details

#constraints(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 45

def constraints(table_name)
  (owner, table_name) = @connection.describe(table_name)

  # RSI: changed select from all_constraints to user_constraints - much faster in large data dictionaries
  fks = select_rows(<<-SQL, 'User Contraints')
    select c.constraint_name, c.search_condition
      from user_constraints c
    where c.owner = '#{owner}'
      and c.table_name = '#{table_name}'
      and c.constraint_type = 'C'
      and c.generated = 'USER NAME'
      and c.status = 'ENABLED'
  SQL
end

#foreign_keys_for(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 3

def foreign_keys_for(table_name)
  (owner, table_name) = @connection.describe(table_name)

  # RSI: changed select from all_constraints to user_constraints - much faster in large data dictionaries
  fks = select_rows(<<-SQL, 'Foreign Keys')
    select parent_c.table_name, cc.column_name
      from user_constraints c, user_constraints parent_c, user_cons_columns cc
    where c.owner = '#{owner}'
      and c.table_name = '#{table_name}'
      and c.r_constraint_name = parent_c.constraint_name
      and c.constraint_type = 'R'
      and cc.owner = c.owner
      and cc.constraint_name = c.constraint_name
  SQL
end

#foreign_keys_of(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/oracle_enhanced_adapter.rb', line 18

def foreign_keys_of(table_name)
  (owner, table_name) = @connection.describe(table_name)

  # RSI: changed select from all_constraints to user_constraints - much faster in large data dictionaries
  fks = select_rows(<<-SQL, 'Remote Foriegn Keys')
    select c.table_name, cc.column_name, c.delete_rule 
      from user_constraints c, user_constraints parent_c, user_cons_columns cc
    where c.owner = '#{owner}'
      and parent_c.table_name = '#{table_name}'
      and c.r_constraint_name = parent_c.constraint_name
      and c.constraint_type = 'R'
      and cc.owner = c.owner
      and cc.constraint_name = c.constraint_name
  SQL
  fks.map do |row| 
    dependent = case row[2] 
      when 'CASCADE'
        :destroy
      when 'SET NULL'
        :nullify
      end
    options = {:to_table => row[0].downcase, :foreign_key =>row[1].downcase.to_sym }
    options[:dependent] = dependent unless dependent.nil?
    options
  end
end