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要求是当删除父级时，必须删除所有相关的子级。当使用休眠注释删除父级时，我面临删除子级的问题，我的父表是Employee，子表是EmployeeProject子表在数据库中有一个外键约束Employee_Number ，问题是什么时候我删除了父级以下错误来请告诉我映射的问题在哪里谢谢

  Hibernate: select employee_.EMPLOYEE_NUMBER, employee_.ADDRESS_1 as ADDRESS2_0_, employee_.ADDRESS_2 as ADDRESS3_0_, employee_.CITY as CITY0_, employee_.DATE_OF_ANNIVERSARY as DATE5_0_, employee_.DATE_OF_BIRTH as DATE6_0_, employee_.DATE_OF_JOINING as DATE7_0_, employee_.DATE_OF_LEAVING as DATE8_0_, employee_.DEPARTMENT_ID as DEPARTMENT9_0_, employee_.FIRST_NAME as FIRST10_0_, employee_.LAST_NAME as LAST11_0_, employee_.MOBILE_NUMBER as MOBILE12_0_, employee_.pincode as pincode0_, employee_.REASON_FOR_LEAVING as REASON14_0_, employee_.state as state0_, employee_.TELEPHONE_NUMBER as TELEPHONE16_0_, employee_.TITLE as TITLE0_ from Employees employee_ where employee_.EMPLOYEE_NUMBER=?
Hibernate: delete from Employees where EMPLOYEE_NUMBER=?
4 Mar, 2013 12:33:32 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1451, SQLState: 23000
4 Mar, 2013 12:33:32 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Cannot delete or update a parent row: a foreign key constraint fails (`employee/employee_project`, CONSTRAINT `FKC1804A88229473A9` FOREIGN KEY (`EMPLOYEE_NUMBER`) REFERENCES `employees` (`EMPLOYEE_NUMBER`))

这是我的父映射

    @OneToMany(mappedBy = "employee", cascade = CascadeType.ALL)
    Collection<EmployeeProject> employeeProjects = new ArrayList<EmployeeProject>();

这是子表映射

    @ManyToOne
    @JoinColumn(name = "EMPLOYEE_NUMBER", insertable = false, updatable = false)
    Employee employee;

这是删除父母（员工）的方法

@Override
public boolean deleteEmployee(Employee employee) {

    Transaction transaction = null;
    boolean flag;
    try {
        transaction = session.beginTransaction();
        session.delete(employee);
        transaction.commit();
        flag = true;

    } catch (HibernateException exception) {
        if (transaction != null)
            transaction.rollback();
        flag = false;
    }
    return flag;
}
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2 回答 2

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试试这个 ， 

          t = session.beginTransaction();
      ExperimentImpl persistentExperiment = session.load(Employee.class, 
             employee.getId());
    session.delete(persistentExperiment);
    t.commit();

会尝试使用要删除的 Experiment 的主键，并在实际删除之前加载：

于 2013-03-04T07:17:54.940 回答
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确保您CASCADE在数据库模式中也标记了外键关系，假设这是您想要的。Hibernate 的级联将负责删除 Hibernate 对象，但它本身不会将DELETE尚未转换为对象的 kill 子记录放入您的应用程序中。

于 2013-03-04T07:22:57.870 回答