Hibernate 一對一雙向關聯深入詳解

1、一對一相對比較簡單。hibernate主要是幫助我們保持了兩張表的id一致！

先建兩張表

• create table h_01.idcard (id integer not null, num integer, primary key (id));

1. create table h_01.student (id integer not null, name varchar(255), primary key (id));

然後是POJO

1. package modle;
3. public class IdCard {
4. private int id;
5. private int num;
6. private Student student;
7. public int getId() {
8. return id;
9. }
10. public void setId(int id) {
11. this.id = id;
12. }
13. public int getNum() {
14. return num;
15. }
16. public void setNum(int num) {
17. this.num = num;
18. }
19. public Student getStudent() {
20. return student;
21. }
22. public void setStudent(Student student) {
23. this.student = student;
24. }
25. }

1. package modle;
3. public class Student {
4. private int id;
5. private String name;
6. private IdCard idCard;
7. public int getId() {
8. return id;
9. }
10. public void setId(int id) {
11. this.id = id;
12. }
13. public String getName() {
14. return name;
15. }
16. public void setName(String name) {
17. this.name = name;
18. }
19. public IdCard getIdCard() {
20. return idCard;
21. }
22. public void setIdCard(IdCard idCard) {
23. this.idCard = idCard;
24. }
26. }