当触发器和存贮过程交互的调用某一个字段的时候会出现这个报错
﹙1﹚ 工具: Navicatfor mysql
﹙2﹚ 错误描述:
1﹚ 在编写考试排名的数据库设计期间,数据库会出现批处理,对该用户不同计算出回答正确数和题目总数的时候,数据库用触发器直接计算出它的正确率
2﹚ 设计完成之后报错为err[1442]
﹙3﹚ 错误解释:
SQLSTATE: HY000 (ER_CANT_UPDATE_USED_TABLE_IN_SF_OR_TRG)消息：由于它已被调用了该存储函数／触发程序的语句使用，不能在存储函数／触发程序 中更新表'%s'。
﹙4﹚ 解决过程
1﹚ 删除触发器.
2﹚ 刷新数据库
3﹚ 重新调用存贮过程即可实现
﹙5﹚ 详细解决说明
1﹚ 该部分错误是调用触发器的同时存贮过程也在使用这个字段,故而出现这个错误
2﹚ 这个存贮过程是要执行多个语句的,当第一部分执行完之后肯定会涉及到该表的改动,那么就会立即触发触发器的操作,触发器会使用该字段.但是存贮过程还没有结束,他 也在继续执行继续使用该字段,故而产生错误
在处理中建议存贮过程实现的功能一体实现,不建议存贮过程+触发器的实现方式.容易产生该错误,并且在后续变更等方面限制会更大,性能也有所影响
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