id, order_id,store_id, message_type, message_content, link, create_time, update_time, create_by, update_by,flag # 动态sql 必须插入 order_id store_id 其他字段可以选择性插入 flag默认插入0 INSERT INTO message_order_seller ( order_id, store_id, message_type, message_content, link, flag ) VALUES ( #{orderId}, #{storeId}, #{messageType}, #{messageContent}, #{link}, 0 ) select from message_order_seller order by id desc # 根据store_id（不是主键）返回 list select from message_order_seller where store_id = #{storeId} and flag = 0 order by id desc update message_order_seller set flag = 1 where order_id = #{orderId}