我正在经历痛苦的打断过程,将他人编成法典。
因此,我决定重新启用一个新数据库,与旧数据库一起使用触发器在两个表格之间传输数据。
现在,我有一个问题,那就是,我听任我。
每张表格中都有一个更新另一个表格的触发点。 一旦更新,它就应当更新另一个表格,但由于两个表格都导致它只是会引发一个问题。
它们是阻止这种情况发生吗?
希望是有意义的,希望你们能够提出建议。
我正在经历痛苦的打断过程,将他人编成法典。
因此,我决定重新启用一个新数据库,与旧数据库一起使用触发器在两个表格之间传输数据。
现在,我有一个问题,那就是,我听任我。
每张表格中都有一个更新另一个表格的触发点。 一旦更新,它就应当更新另一个表格,但由于两个表格都导致它只是会引发一个问题。
它们是阻止这种情况发生吗?
希望是有意义的,希望你们能够提出建议。
您应当将数据输入一个db,并利用触发器将数据复制到第二个db。 说你对数据的存在进行核对,并退出触发器。 基本上只要有记录,就无所作为。 该网站具有良好的指导:
http://www.database Design-resource.com/mysql-triggers.html。
你们可能想读一下我的SQL手册中的触发点:
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