Question

首先我使用：

-Eclipse Kepler

-JPA 2.1

-MySql 5.1

-MySql连接器5.1

-EclipseLink 2.5

涉及4个班级：

- 涉及多对多关系的正常类（我不会发布此代码） -an抽象类（它只包含一个thisId字段） - 继承自前一个的普通类 - 继承自其他普通类

的另一个普通类

这是最后两个类的代码

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class MyObject extends AbstractObject implements Serializable {

@Column(nullable = false)
private String name;

private String descr;
private static final long serialVersionUID = 1L;
    @ManyToMany
    @JoinTable(name = "relation",
        joinColumns =
        @JoinColumn(name = "thisId", referencedColumnName = "thisId"),
        inverseJoinColumns =
        @JoinColumn(name = "otherId", referencedColumnName = "otherId"))
    private List<OtherClass> listHoldingTheRelationship;
// Getters and setters, other methods
}

多对多只有拥有方，因此所涉及的OtherClass中没有特殊的注释这是最后一节课的代码：

public class MyObjectPers extends MyObject implements Serializable {


private static final long serialVersionUID = 1L;
private int field;
//getters setter, other methods
}

当我尝试创建MyObjectPers时，我得到了这个：

12:02:33    INSERT INTO `myDB`.`relation` (`otherId`, `thisId`) VALUES ("209",
"888")  Error Code: 1452. Cannot add or update a child row: a foreign key
constraint fails (`mydb`.`relation`, CONSTRAINT `FK_PKG_ESC_thisId` FOREIGN KEY
(`thisId`) REFERENCES `MyObjectPers` (`thisId`))    0.015 sec

我哪里出错了？

Jpa多对多关系因继承而失败

0 个答案: