[英]Hibernate; HQL; why does the delete query not work, but select does?
[英]Why hibernate delete operation does not work?
我有一個基本的Spring MVC項目,具有針對User和Task類的經典dao設計。 我正在為Web應用程序使用Hibernate OpenSessionInView過濾器模式; 但是,我的UserService
無法正常運行,實際上是其刪除操作。 問題是,我對此方法有一個簡單的單元測試,而且似乎運行良好,因為當我運行它時,一切正常,但是當我通過webapp測試時,像這樣: curl -X DELETE "http://myhost:port/users/someUserId"
,刪除操作根本不起作用,因為對象一旦被調用就保持不變。
這是我的UserService
一部分:
@Override
public <T> User get(String key, T value) {
User u = new User();
switch (key) {
case "id":
u = (User) session.getCurrentSession().get(User.class, (Serializable) value);
break;
case "email":
u = (User) session.getCurrentSession().createQuery("from User u where u.email = :email").setParameter("email", value.toString()).uniqueResult();
break;
case "username":
u = (User) session.getCurrentSession().createQuery("from User u where u.username = :username").setString("username", (String) value).uniqueResult();
break;
}
if (u != null ) Hibernate.initialize(u.getTasks());
return u;
}
@Override
public void delete(Integer userId) {
session.getCurrentSession().delete(get("id",userId));
}
和UserController
:
@RequestMapping(value="/{id}", method=RequestMethod.DELETE)
public String deleteMemeber(@PathVariable Integer id) {
userService.delete(id);
return "redirect:/";
}
並刪除UserService
的單元測試:
@Test
public void testUserDeleteService() {
List<User> preUsers = userService.findAll();
User userToDelete = userService.findById(3);
userService.delete(3);
List<User>postUsers = userService.findAll();
assertNotEquals(preUsers, postUsers);
assertEquals(preUsers.size() - 1, postUsers.size());
assertFalse(userService.findAll().contains(userToDelete));
assertNull(userService.findById(3));
}
為什么會這樣?
調用delete方法時,這是日志記錄:
Hibernate: select user0_.id as id1_1_0_, user0_.email as email2_1_0_, user0_.first_name as first_na3_1_0_, user0_.last_name as last_nam4_1_0_, user0_.password as password5_1_0_, user0_.role as role6_1_0_, user0_.enabled as enabled7_1_0_, user0_.username as username8_1_0_ from users user0_ where user0_.id=?
Hibernate: select user0_.id as id1_1_0_, user0_.email as email2_1_0_, user0_.first_name as first_na3_1_0_, user0_.last_name as last_nam4_1_0_, user0_.password as password5_1_0_, user0_.role as role6_1_0_, user0_.enabled as enabled7_1_0_, user0_.username as username8_1_0_ from users user0_ where user0_.id=?
Hibernate: select tasks0_.user_id as user_id6_1_0_, tasks0_.id as id1_0_0_, tasks0_.id as id1_0_1_, tasks0_.created_on as created_2_0_1_, tasks0_.deadline as deadline3_0_1_, tasks0_.description as descript4_0_1_, tasks0_.name as name5_0_1_, tasks0_.user_id as user_id6_0_1_ from tasks tasks0_ where tasks0_.user_id=?
Hibernate: select tasks0_.user_id as user_id6_1_0_, tasks0_.id as id1_0_0_, tasks0_.id as id1_0_1_, tasks0_.created_on as created_2_0_1_, tasks0_.deadline as deadline3_0_1_, tasks0_.description as descript4_0_1_, tasks0_.name as name5_0_1_, tasks0_.user_id as user_id6_0_1_ from tasks tasks0_ where tasks0_.user_id=?
您可以更改刪除方法並嘗試一下嗎?
private boolean deleteById(Class<?> type, Serializable id) {
Object persistentInstance = session.load(type, id);
if (persistentInstance != null) {
session.delete(persistentInstance);
return true;
}
return false;}
只需通過deleteById(User.class,id)調用即可;
是否有任何孩子班級或1tomany或many2many協會?
試試這個刪除方法:
@Override
public void delete(Integer userId) {
session.getCurrentSession().delete(get("id",userId));
session.getCurrentSession().flush();
}
,也許您只需要刷新活動會話即可查看更改。
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