Hibernate使用注解設定關聯關系

一、one to one，從表主鍵引用主表主鍵

主表實體：

1. @Entity
2. @Table(name="EMPLOYEE")
3. public class Employee {
5. @Id
6. @GeneratedValue
7. @Column(name="employee_id")
8. private Long employeeId;
10. @Column(name="name")
11. private String name;
13. @OneToOne(mappedBy="employee", cascade=CascadeType.ALL)
14. private EmployeeDetail employeeDetail;
16. public Employee() {
18. }
20. // Getter and Setter methods
21. }

從表實體：

1. @Entity
2. @Table(name="EMPLOYEEDETAIL")
3. public class EmployeeDetail {
5. @Id
6. @Column(name="employee_id", unique=true, nullable=false)
7. @GeneratedValue(generator="gen")
8. @GenericGenerator(name="gen", strategy="foreign", parameters=@Parameter(name="property", value="employee"))
9. private Long employeeId;
11. @Column(name="street")
12. private String street;
14. @OneToOne
15. @PrimaryKeyJoinColumn
16. private Employee employee;
18. public EmployeeDetail() {
20. }
22. // Getter and Setter methods
23. }

注意：設定mappedBy的那一方不進行主表到從表關系的維護，即對employee的更改，不會影響到employeedetail。