Hibernate 一对一双向关联深入详解
Hibernate 一对一双向关联深入详解
1、一对一相对比较简单。hibernate主要是帮助我们保持了两张表的id一致!
先建两张表
- create table h_01.idcard (id integer not null, num integer, primary key (id));
- create table h_01.student (id integer not null, name varchar(255), primary key (id));
然后是POJO
- package modle;
- public class IdCard {
- private int id;
- private int num;
- private Student student;
- public int getId() {
- return id;
- }
- public void setId(int id) {
- this.id = id;
- }
- public int getNum() {
- return num;
- }
- public void setNum(int num) {
- this.num = num;
- }
- public Student getStudent() {
- return student;
- }
- public void setStudent(Student student) {
- this.student = student;
- }
- }
- package modle;
- public class Student {
- private int id;
- private String name;
- private IdCard idCard;
- public int getId() {
- return id;
- }
- public void setId(int id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public IdCard getIdCard() {
- return idCard;
- }
- public void setIdCard(IdCard idCard) {
- this.idCard = idCard;
- }
- }
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