@OneToOne-级联所有不保存父Id的项

Question

伙计们！我在保存"子"表的父id时遇到问题。当持久化子对象时，父id为null的列。。

父级(用户类(

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "user_id")
private long userId;
@Column(name = "name")
private String name;
@Column(name = "address")
private String address;
@Column(name = "postcode")
private int postCode;

子级(凭证类(

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="credential")
public class Credentials {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="id")
private int id;
@Column(name="username")
private String username;
@Column(name="password")
private String password;

@OneToOne(cascade= CascadeType.ALL )
@JoinColumn(name="user_id")
public User user;

应用程序类

    User user = new User();
    user.setAddress("asdkapoda");
    user.setName("xaxaxaxa");
    user.setPostCode(3423);
    Credentials credit = new Credentials();
    credit.setPassword("sadsad");
    credit.setUsername("sdadsa");
    session.save(credit);   

在数据库中，Credential的user_id=NULL。休眠4.3

Answer 1

Hibernate忠实地保存了这样一个事实，即实际上从未将Credentials对象与User对象关联。尝试在保存之前添加credit.setUser(user);。