Question

我已经通过SQL手动创建了表。

    CREATE TABLE author(
author_id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(20),
author_phone_fk INT NULL,
CONSTRAINT  `author_phone_fk`
FOREIGN KEY(author_phone_fk) REFERENCES phone(phone_id));

CREATE TABLE phone(
phone_id INT AUTO_INCREMENT PRIMARY KEY,
number VARCHAR(20));

我上课了

@Entity
public class Phone {

    @Id
    @Column(name = "phone_id")
    private int id;

    private String number;

  }

@Entity
public class Author {

    @Id
    @Column(name = "author_id")
    private int id;

    private String name;

    @OneToOne(cascade = CascadeType.PERSIST)
    @JoinColumn(name = "author_phone_fk")
    private Phone phone;
}

在保存Author对象时，我有例外

无法添加或更新子行：外键约束失败（{final_project。author，约束author_phone_fk外键（{author_phone_fk）参考文献phone（phone_id））

我不知道如何解决该错误。 Tnx

测试数据：

 EntityManagerFactory emf = Persistence.createEntityManagerFactory("test");

        EntityManager em = emf.createEntityManager();

        EntityTransaction transaction = em.getTransaction();

        transaction.begin();

        Phone myPhone = new Phone("89198130228");

        Author myAuthor = new Author("Alex", myPhone);

        em.persist(myAuthor);

        transaction.commit();

        em.close();

Stacktrace：

休眠：插入电话（数字，phone_id）值（？，？）休眠：插入作者（名称，author_phone_fk，author_id）值（？，？，？）线程“ main”中的异常 javax.persistence.RollbackException：提交错误交易于 org.hibernate.internal.ExceptionConverterImpl.convertCommitException（ExceptionConverterImpl.java:77）在 org.hibernate.engine.transaction.internal.TransactionImpl.commit（TransactionImpl.java:71）在domain.TestAdvert.main（TestAdvert.java:44）上，由以下原因引起： javax.persistence.PersistenceException： org.hibernate.exception.ConstraintViolationException：无法执行语句的原因： com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：无法添加或更新子行：外键约束失败（{final_project。author，约束author_phone_fk外键（{author_phone_fk）参考文献phone（phone_id））

在JPA中使用手动创建的表

0 个答案: