search

c3b2a7 / c3b2a7.github.io

https://lolico.me
4 stars 0 forks source link

EntityManagerFactory和EntityManager | Lolico's Blog #42

Open c3b2a7 opened 4 years ago

c3b2a7 commented 4 years ago

https://lolico.me/2019/11/12/EntityManagerFactory%E5%92%8CEntityManager/

常见异常及可能的解决办法javax.persistence.TransactionRequiredException: no transaction is in progress可能的原因：没有开启事务开启事务没有生效@Transactional注解是作用于EntityManager的操作的层级上EntityManagerFactory#createEntityManager生成的EntityMa