我正在尝试将对象保存到数据库,但它没有保存到数据库中。
UserDetails.java
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="USER_DETAILS")
public class UserDetails {
@Id @GeneratedValue()
@Column(name="USER_ID")
private int userId;
@Column(name="USER_NAME")
private String userName;
//...getter and setters
}
App.java
public class App {
public static void main(String[] args) {
UserDetails user = new UserDetails();
user.setUserName("abc");
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
Object o = session.save(user);
System.out.println("User saved with id - " +o);
System.out.println("HashCode of session 1st "+session.hashCode());
session.close();
session = factory.openSession();
System.out.println("HashCode of session 2nd "+session.hashCode());
UserDetails user1 =(UserDetails)session.get(UserDetails.class,Integer.valueOf(o.toString()));
System.out.println(user1.getUserName());
session.close();
}
}
日志:
Hibernate: insert into USER_DETAILS (USER_ID, USER_NAME) values (default, ?)
Hibernate: values identity_val_local()
User saved with id - 1
HashCode of session 1st 9299042
HashCode of session 2nd 12206609
Hibernate: select userdetail0_.USER_ID as USER1_0_0_, userdetail0_.USER_NAME as USER2_0_0_ from USER_DETAILS userdetail0_ where userdetail0_.USER_ID=?
abc
我没有使用该事务,我知道如果我将session.save代码放在session.beginTransaction()和session.getTransaction()。commit()中,数据将保存在数据库中。但是,当我在做session.save()时我正在进行会话。我正在进行会话。我如何获取对象?
如果它是第一级缓存然后是怎么...因为我也在关闭会话并打开一个新会话。我也没有配置任何二级缓存。
请提供有价值的意见。