将主键添加到 sql 视图

问题描述

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怎么做没有主键的表或视图的休眠映射

我想知道如何向我的视图添加主键，因为它基本上只是一个存储查询......?

I am wondering how to add a primary key to my view as it is basically just a stored query...?

PS:甲骨文 10g

谢谢

推荐答案

我们可以向视图添加禁用主键约束.也就是说，如果对视图运行插入或更新，则约束不会触发.数据库希望通过对基础表的约束来维护完整性.因此，此约束仅用于文档目的.

We can add a disabled primary key constraint to a view. That is, the constraint does not fire if an insert or update is run against the view. The database expects integrity to be maintained through constraints on the underlying tables. So the constraint exists solely for the purposes of documentation.

SQL> create view emp_view as select * from emp
  2  /


View created.

SQL> alter view emp_view add constraint vemp_pk primary key (empno) disable
  2  /

View altered.

SQL> 

警告:我从未在 Hibernate 中尝试过这个，所以我不知道它是否适用于您的场景.但是，我确实知道专门针对视图层使用 Hibernate 的站点，所以我认为它确实如此.请尝试语法并反馈.

Caveat: I have never tried this with Hibernate, so I don't know whether it would work in your scenario. However, I do know sites which use Hibernate exclusively against a layer of views, so I presume it does. Please experiment with the syntax and report back.

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