Hibernate 不保存对象，即使在日志中没有收到任何错误

Question

我在 db 中有一个 table。创建了一个 pojo class 以将 class 实例映射到 table。我的 class 结构是

   @Entity
    @Table(name = "example")
    class example {
     @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        @Column(name = "ID")
        int id;
        @Column(name = "SLOT_ID")
        int slot_id;
        @Column(name = "SLOT_DATE")
        String slot_date;
        @Column(name = "HOTEL_ID")
        String hotel_id;
        @Column(name = "ROOM_TYPE_ID")
        String room_type_id;
        @Column(name = "CREATE_DATE")
        String create_date;
        @Column(name = "UPDATE_DATE")
        String update_date;
        @Column(name = "SLOT_PRICE")
        Double slot_price;
        @Column(name = "AVAILABLE_ROOMS")
        Integer available_roooms;

//rest have getter and setter method }

Hibernet 提交部分

  public void save(Example example) {

        Session session = null;
        try {
            log.info( example.toString());
            session = this.sessionFactory.openSession();
            Transaction tx = session.beginTransaction();
            session.persist(example);
            tx.commit();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            session.close();
        }
    }

在日志中，我收到此日志

Hibernate: insert into example(AVAILABLE_ROOMS, CREATE_DATE, HOTEL_ID, ROOM_TYPE_ID, SLOT_DATE, SLOT_ID, SLOT_PRICE, UPDATE_DATE) values (?, ?, ?, ?, ?, ?, ?, ?)

我可以从同一个 table 中获取数据，这里是 Code snap `

session = this.sessionFactory.openSession(); 
Criteria cr = session.createCriteria(Example.class); cr.add(Restrictions.eq("id", id)); List results = cr.list();
 if(results.size()>0) 
return mapper.writeValueAsString(results.get(0)); //id is auto //incremented in table`

我在日志中没有看到任何错误，但是当我在数据库中检查时，没有任何数据 inserted.Any 提示我错过了什么？

Answer 1

使用此代码并测试一次

public void save(Example example) {
    Session session = null;
    Transaction tx=null;
    try {
        log.info( example.toString());
        session = this.sessionFactory.openSession();
        tx = session.beginTransaction();
        session.persist(example);
        tx.commit();

    } catch (Exception e) {
        e.printStackTrace();
    } finally {

     if (!tx.wasCommitted()) {
     tx.rollback();
     }//not much doing but a good practice
     session.flush(); //this is where I think things will start working.
     session.close();
    }
}

关闭前调用 flush 的充分理由是 here

Answer 2

我认为您必须使用 session.save() 而不是 session.persist()，或者您必须按照 Viraj 的指示在事务结束时使用刷新，另请参阅此 post

What's the advantage of persist() vs save() in Hibernate?

Hibernate 不保存对象，即使在日志中没有收到任何错误

Hibernate does not save Object even not getting any error in log

java

hibernate

spring-mvc

hibernate-mapping

spring-annotations