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请问下多对多关联关系,中间表插入数据?还有设置中间表的好处

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Release: 2016-06-06 20:33:17
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请问下多对多关联关系,中间表插入数据?
例如表user(id1,uname),role(id2,name),ueser_role(id1,di2,);
能不能实现在user表和role表插入数据后,ueser_role表自动插入数据呢?

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请问下多对多关联关系,中间表插入数据?
例如表user(id1,uname),role(id2,name),ueser_role(id1,di2,);
能不能实现在user表和role表插入数据后,ueser_role表自动插入数据呢?

  • 可以考虑用Trigger
  • 但由于你的插入不一定会成功,要更好保证数据的一致性,应该用TRANSACTION
  • 如果只是一对一的关系,为什么不存一张宽表呢?比如表user:id/name/id2
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