    # File lib/active_record/connection_adapters/oracle_adapter.rb, line 178
            def native_database_types #:nodoc
              {
                :primary_key => "NUMBER(38) NOT NULL PRIMARY KEY",
                :string      => { :name => "VARCHAR2", :limit => 255 },
                :text        => { :name => "CLOB" },
                :integer     => { :name => "NUMBER", :limit => 38 },
                :float       => { :name => "NUMBER" },
                :datetime    => { :name => "DATE" },
                :timestamp   => { :name => "DATE" },
                :time        => { :name => "DATE" },
                :date        => { :name => "DATE" },
                :binary      => { :name => "BLOB" },
                :boolean     => { :name => "NUMBER", :limit => 1 }
              }
            end