prepare_statement

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 961
        def prepare_statement(sql, binds, conn)
          sql_key = sql_key(sql)
          unless @statements.key? sql_key
            nextkey = @statements.next_key
            begin
              conn.prepare nextkey, sql
            rescue => e
              raise translate_exception_class(e, sql, binds)
            end
            # Clear the queue
            conn.get_last_result
            @statements[sql_key] = nextkey
          end
          @statements[sql_key]
        end