instance method connect

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 940
        def connect
          @connection = PGconn.connect(*@connection_parameters)
          PGconn.translate_results = false if PGconn.respond_to?(:translate_results=)

          # Ignore async_exec and async_query when using postgres-pr.
          @async = @config[:allow_concurrency] && @connection.respond_to?(:async_exec)

          # Money type has a fixed precision of 10 in PostgreSQL 8.2 and below, and as of
          # PostgreSQL 8.3 it has a fixed precision of 19. PostgreSQLColumn.extract_precision
          # should know about this but can't detect it there, so deal with it here.
          money_precision = (postgresql_version >= 80300) ? 19 : 10
          PostgreSQLColumn.module_eval(<<-end_eval)
            def extract_precision(sql_type)  # def extract_precision(sql_type)
              if sql_type =~ /^money$/       #   if sql_type =~ /^money$/
                #{money_precision}           #     19
              else                           #   else
                super                        #     super
              end                            #   end
            end                              # end
          end_eval

          configure_connection
        end