休眠一对一映射.从依赖表中删除行

Question

表格：学生，地址Student.ADDR_ID列映射到 Address.ID

我的学生班级注释如下

public class Student {
String name, surname;
int rollNumber;
Teacher classTeacher;
Address address;
@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name="ADDR_ID")
public Address getAddress() {
    return address;
}
:
:

它在创建和更新的情况下工作正常。

如果我将学生的地址更改为新地址，那么它会创建一个新行，但不会删除旧地址的行。如果我将地址设置为空，它仍然不会删除

例如

 Student s1 = session.get(Student.class, 24);
 Address addr = new Address();
 session.save(addr);
 s1.setAddress(addr);
 session.save(s1);
 or
 Student s1 = session.get(Student.class, 24);
 s1.setAddress(null);

我已经设置了级联所有。需要做什么额外/不同的事情。逆在这里适用吗？

Answer 1

如果适合

您，您应该使用orphanremoval = true

@OneToOne(cascade=CascadeType.ALL, orphanRemoval=true)
@JoinColumn(name="ADDR_ID")
public Address getAddress() {
}

Answer 2

在我的情况下，一对一删除级联不起作用，因为未使用事务。这里工作正常...

@Entity
@Table(name="student")
public class Student {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private Long id;
    @Column(name="student_name",length=60)
    private String studentName;
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name = "address_id")
    private Address address;
    //Setter Getter
}
@Entity
@Table(name = "address_table")
public class Address {
    @Id
    @Column(name = "address_id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long addressId;
    @Column(name = "street_name", length = 50)
    private String street;
    @Column(name = "city_name", length = 50)
    private String city;
    //Setter Getter
}

Student student = session.get(Student.class, 1L);
session.beginTransaction();
session.delete(employee);
session.getTransaction().commit();