hibernate.hbm2ddl.auto
嗯,在程序启动时自动创建数据表结构,
下面贴一下可选值意义:
- create:
每次加载hibernate时都会删除上一次的生成的表,然后根据你的model类再重新来生成新表,哪怕两次没有任何改变也要这样执行,这就是导致数据库表数据丢失的一个重要原因。 - create-drop:
每次加载hibernate时根据model类生成表,但是sessionFactory一关闭,表就自动删除。 - update:
最常用的属性,第一次加载hibernate时根据model类会自动建立起表的结构(前提是先建立好数据库),以后加载hibernate时根据 model类自动更新表结构,即使表结构改变了但表中的行仍然存在不会删除以前的行。要注意的是当部署到服务器后,表结构是不会被马上建立起来的,是要等 应用第一次运行起来后才会。 - validate:
每次加载hibernate时,验证创建数据库表结构,只会和数据库中的表进行比较,不会创建新表,但是会插入新值。
2022年8月05日 22:00
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