Question

我试图使用以下Hibernate查询语言更新数据库表

@RequestMapping(value = "/update",method = RequestMethod.POST)
    public @ResponseBody String update(@RequestParam(value = "score1",required = true) String score1,
                                       @RequestParam(value = "score2",required = true) String score2,
                                       @RequestParam(value = "score3",required = true) String score3,
                                       @RequestParam(value = "score4",required = true) String score4,
                                       @RequestParam(value = "id",required = true)String id,
                                       Model model)
    {
        SessionFactory sessionFactory=new Configuration().configure("hibernate.cfg.xml")
                .addAnnotatedClass(User.class)
                .addAnnotatedClass(UserDetail.class)
                .addAnnotatedClass(UserScores.class).buildSessionFactory();
        Session session=sessionFactory.getCurrentSession();
        try
        {
            System.out.println("ID is"+id);
            session.beginTransaction();
            session.createQuery("update UserScores u set " +
                   "u.score1=:score1," +
                   "u.score2=:score2," +
                   "u.score3=:score3," +
                   "u.score4=:score4 where u.ID=:id")
                   .setParameter("score1",score1)
                   .setParameter("score2",score2)
                   .setParameter("score3",score3)
                   .setParameter("score4",score4)
                   .setParameter("id",id);
            session.getTransaction().commit();
            session.close();
        }
        catch (Exception e)
        {
            System.out.println(e);
        }

        return score1+score2+score3+score4;
    }

执行此代码后，它没有给出任何错误，但数据库中的数据未更新

执行此代码有什么问题

Answer 1

它起作用了，我尝试了另一种方式

@RequestMapping(value = "/update",method = RequestMethod.POST)
public @ResponseBody String update(@RequestParam(value = "score1",required = true) String score1,
                                   @RequestParam(value = "score2",required = true) String score2,
                                   @RequestParam(value = "score3",required = true) String score3,
                                   @RequestParam(value = "score4",required = true) String score4,
                                   @RequestParam(value = "id",required = true)String id,
                                   Model model)
{
    SessionFactory sessionFactory=new Configuration().configure("hibernate.cfg.xml")
            .addAnnotatedClass(User.class)
            .addAnnotatedClass(UserDetail.class)
            .addAnnotatedClass(UserScores.class).buildSessionFactory();
    Session session=sessionFactory.getCurrentSession();

    try
    {
        session.beginTransaction();
        System.out.println("ID is"+id);
        UserScores userScores=session.get(UserScores.class,Integer.parseInt(id));
        userScores.setScore1((Double.parseDouble(score1)));
        userScores.setScore2((Double.parseDouble(score2)));
        userScores.setScore3((Double.parseDouble(score3)));
        userScores.setScore4((Double.parseDouble(score4)));
        session.update(userScores);
        session.getTransaction().commit();
        session.close();
    }
    catch (Exception e)
    {
        System.out.println(e);
    }

Answer 2

您正在创建的查询需要使用 query.executeUpdate（）

执行

session.beginTransaction();
Query query = session.createQuery("update UserScores u set " +
                       "u.score1=:score1," +
                       "u.score2=:score2," +
                       "u.score3=:score3," +
                       "u.score4=:score4 where u.ID=:id");
query.setParameter("score1",score1)
query.setParameter("score2",score2)
query.setParameter("score3",score3)
query.setParameter("score4",score4)
query.setParameter("id",id);
query.executeUpdate();
session.getTransaction().commit();
session.close();

另一种方法是对持久性实体进行更改。在这种情况下，更新将自动传播。

无法将数据更新到DB：org.hibernate.hql.internal.QueryExecutionRequestException：DML操作不支持

2 个答案: