exec_cache(sql, binds) private

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# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 965
      def exec_cache(sql, binds)
        unless @statements.key? sql
          nextkey = "a#{@statements.length + 1}"
          @connection.prepare nextkey, sql
          @statements[sql] = nextkey
        end

        key = @statements[sql]

        # Clear the queue
        @connection.get_last_result
        @connection.send_query_prepared(key, binds.map { |col, val|
          type_cast(val, col)
        })
        @connection.block
        @connection.get_last_result
      end
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