Hibernat之关系的处理一对一处理

第一步：编写两个pojo，比如一个学生表一个班级表  这里使用注解。

需要

公司表:

 1 package com.qcf.pox;

 2 

 3 import javax.persistence.CascadeType;

 4 import javax.persistence.Entity;

 5 import javax.persistence.GeneratedValue;

 6 import javax.persistence.GenerationType;

 7 import javax.persistence.Id;

 8 import javax.persistence.OneToOne;

 9 

10 @Entity

11 public class Company {

12     @Id

13     @GeneratedValue(strategy=GenerationType.AUTO)

14     private int id;

15     private String name;

16     @OneToOne(cascade=CascadeType.ALL)

17     private Address address;

18     public int getId() {

19         return id;

20     }

21     public void setId(int id) {

22         this.id = id;

23     }

24     public String getName() {

25         return name;

26     }

27     public void setName(String name) {

28         this.name = name;

29     }

30     public Address getAddress() {

31         return address;

32     }

33     public void setAddress(Address address) {

34         this.address = address;

35     }

36     public Company(int id, String name, Address address) {

37         super();

38         this.id = id;

39         this.name = name;

40         this.address = address;

41     }

42     public Company() {

43         super();

44     }

45     

46 }

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地址表：

 1 package com.qcf.pox;

 2 

 3 import javax.persistence.CascadeType;

 4 import javax.persistence.Entity;

 5 import javax.persistence.GeneratedValue;

 6 import javax.persistence.GenerationType;

 7 import javax.persistence.Id;

 8 import javax.persistence.OneToOne;

 9 

10 @Entity

11 public class Address {

12     @Id

13     @GeneratedValue(strategy=GenerationType.AUTO)

14     private int id;

15     private String name;

16     @OneToOne(cascade=CascadeType.ALL,mappedBy="address")

17     private Company company;

18     public int getId() {

19         return id;

20     }

21     public void setId(int id) {

22         this.id = id;

23     }

24     public String getName() {

25         return name;

26     }

27     public void setName(String name) {

28         this.name = name;

29     }

30     public Company getCompany() {

31         return company;

32     }

33     public void setCompany(Company company) {

34         this.company = company;

35     }

36     public Address(int id, String name, Company company) {

37         super();

38         this.id = id;

39         this.name = name;

40         this.company = company;

41     }

42     public Address() {

43         super();

44     }

45     

46 }

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第二步：在hibernate.cfg.xml文件中引入这两个po类

 

1         <mapping class="com.qcf.pox.Address"/>

2         <mapping class="com.qcf.pox.Company"/>

View Code

 

第三步：编写测试代码

 

 1 package com.qcf.test;

 2 

 3 import org.hibernate.Session;

 4 import org.hibernate.SessionFactory;

 5 import org.hibernate.Transaction;

 6 import org.hibernate.cfg.AnnotationConfiguration;

 7 import org.hibernate.cfg.Configuration;

 8 

 9 import com.qcf.pox.Address;

10 import com.qcf.pox.Company;

11 

12 public class TestOneToOne {

13     public static void main(String[] args) {

14         Configuration configuration=new AnnotationConfiguration().configure();

15         SessionFactory factory=configuration.buildSessionFactory();

16         Session session=factory.openSession();

17         Transaction transaction=session.beginTransaction();

18         Address address=new Address();

19         address.setName("beijing");

20         Company company=new Company();

21         address.setCompany(company);

22         company.setName("zhandaf");

23         company.setAddress(address);

24         session.save(address);

25         session.save(company);

26         transaction.commit();

27         session.close();

28         

29     }

30 

31 }

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