PrimaryKeyJoinColumn
我在父端使用带注释的一对一关系。现在我想自己保存子实体。
例如,我有Employee
并且EmpInfo
作为子实体,我需要保存EmpInfo
(当然在将父实体的 id 属性设置为它之后)。但是,当使用这种安排时,我会得到下面列出的例外情况......
org.springframework.dao.InvalidDataAccessApiUsageException: detached entity passed to persist
任何想法为什么休眠不允许这样做?更清楚地说,我的代码如下......
父实体:
public class Employee {
private Long id;
private String name;
private EmployeeInfo info;
private Integer enumId;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId() {
return id;
}
@Column(name="EMP_NAME")
public String getName() {
return name;
}
@PrimaryKeyJoinColumn
@OneToOne(cascade = CascadeType.REMOVE)
public EmployeeInfo getInfo() {
return info;
}
}
子实体:
@Table(name="EMP_INFO")
@Entity
public class EmployeeInfo {
private Long id;
private String email;
@Column(name="EMPLOYEE_EMAIL")
public String getEmail() {
return email;
}
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "emp_id", nullable = false)
public Long getId() {
return id;
}
}
我尝试保存它的方法是...
Employee emp = new Employee();
emp.setEnumId(SimpleEnum.COMPLETE);
emp.setName("Shreyas");
EmployeeInfo info = new EmployeeInfo();
info.setEmail("Sh@gmail");
concreteDAO.save(emp); // This uses the JPATemplate provided by Spring JpaDaoSupport
info.setId(emp.getId());
concreteDAO.saveEmpInfo(info);
任何指针都将不胜感激,至于如何尝试保存子实体?