Question

表：学生，地址 Student.ADDR_ID列映射到Address.ID

我的Student课程中的注释如下

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;
}
:
:

在创建和更新案例中工作正常。

如果我将Student的地址更改为new，则会创建一个新行，但不会删除旧地址的行。如果我将地址设置为null仍然不会删除

e.g。

 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);

我已设置级联ALL。需要做多少/不同的事情。 Inverse适用于此吗？

Answer 1

如果您满意，则应使用orphanremoval = true

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

Answer 2

在我的情况下，由于未使用事务，一对一删除级联无法正常工作。在这里工作正常...

@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();

Hibernate一对一映射。从依赖表中删除行

2 个答案: