Question

当我使用实体映射的共享主键时，我对Hibernate创建的sql有问题。我使用的是JPA 2.1和Hibernate 5.2.2

这是我的实体：

@Entity
@Column(name = "employee_table")
public class EmployeeEntity {

    @Id
    @Column(name = "id")
    @SequenceGenerator
    @GeneratedValue
    private Long id;

    @OneToOne(fetch = FetchType.LAZY)
    @PrimaryKeyJoinColumn
    private EmployeeDetailsEntity employeeDetailsEntity;
}

@Entity
@Table(name = "employee_details")
public class EmployeeDetailsEntity {

    @Id
    @Column(name = "id")
    private Long id;

    // additional attributes

}

我想选择所有具有详细信息的员工：

select e from EmployeeEntity e where e.employeeDetailsEntity is not null;

选择由Hibernate生成的：

select employeeen0_.id from employee_table employeeen0_ where employeeen0_.id is not null;

请你解释一下我做错了什么并帮助解决这个问题？

Answer 1

看起来你错过了＆＃34;另一方＆＃34;员工 - ＆gt; EmployeeDetails关系映射：

员工实体：

private EmployeeDetails employeeDetails;

    @OneToOne(mappedBy = "employee", fetch = FetchType.LAZY)
    public EmployeeDetails getEmployeeDetails() {
        return employeeDetails;
    }

EmployeeDetails实体：

private Employee employee;

    @OneToOne(optional = false)
    @JoinColumn(name = "EMPLOYEE_ID")
    public Employee getEmployee() {
        return employee;
    }

Answer 2

感谢所有评论的人。问题是使用EmployeeEntity主键在EmployeeDetailsEntity上的@PrimaryKeyJoinColumn，并且在你的hql中检查本机sql Hibernate的null（或非null）的EmployeeDetailsEntity使用了EmployeeEntity的id，因为你与另一个（EmployeeDetailsEntity）实体共享这个PK。

如果您不想（不能）改变您的映射，请在您的hql查询中使用join或更改@OneToOne映射。

Hibernate：在HQL

2 个答案: