Spring Data JPA实体的生命周期总结 (4)

删除态：抛异常org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.ObjectDeletedException: deleted instance passed to merge: [com.example.demo.entity.User#<null>]...

游离态：提交到数据库，进行更新或插入，返回一个新的托管态的对象

合并（merge）删除态和游离态验证过程如下：

1.删除态

代码

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  /**
* 持久化删除态的对象
*@param id
* @return
*/
@RequestMapping("/mergeRemove/{id}")
public String mergeRemove(@PathVariable("id")Long id){
try {
User user = userDao.findById(id);
userDao.mergeRemove(user);
}catch (Exception e){
logger.error("合并(merge)一个删除态的对象!",e);
return REPONSE_ERR;
}
return REPONSE_SUCCESS;
}
--------------------------------------------------------------------
/**
* 合并删除态的对象
*
* @param user
*/
@Override
public void mergeRemove(User user) {
remove(user);
merge(user);
}
 

步骤

:8080/user/list，获取`id`

:8080/user/mergeRemove/{id}

结果：返回ERROR抛异常！

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  2019-01-26 00:23:01.187 INFO 10136 --- [nio-8080-exec-3] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
Hibernate: select user0_.id as id1_0_, user0_.name as name2_0_, user0_.number as number3_0_ from t_user user0_ where user0_.id=?
2019-01-26 00:23:01.322 ERROR 10136 --- [nio-8080-exec-3] c.e.demo.controller.UserController : 合并(merge)一个删除态的对象!

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.ObjectDeletedException: deleted instance passed to merge: [com.example.demo.entity.User#<null>]; nested exception is java.lang.IllegalArgumentException: org.hibernate.ObjectDeletedException: deleted instance passed to merge: [com.example.demo.entity.User#<null>]
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:373) ~[spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:255) ~[spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:527) ~[spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:61) ~[spring-tx-5.1.4.RELEASE.jar:5.1.4.RELEASE]
 

2.游离态