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:

 package com.qcf.pox;

 import javax.persistence.CascadeType;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.OneToOne;

 @Entity
 public class Company {
     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     private int id;
     private String name;
     @OneToOne(cascade=CascadeType.ALL)
     private Address address;
     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 Address getAddress() {
         return address;
     }
     public void setAddress(Address address) {
         this.address = address;
     }
     public Company(int id, String name, Address address) {
         super();
         this.id = id;
         this.name = name;
         this.address = address;
     }
     public Company() {
         super();
     }

 }

地址表：

 package com.qcf.pox;

 import javax.persistence.CascadeType;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.OneToOne;

 @Entity
 public class Address {
     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     private int id;
     private String name;
     @OneToOne(cascade=CascadeType.ALL,mappedBy="address")
     private Company company;
     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 Company getCompany() {
         return company;
     }
     public void setCompany(Company company) {
         this.company = company;
     }
     public Address(int id, String name, Company company) {
         super();
         this.id = id;
         this.name = name;
         this.company = company;
     }
     public Address() {
         super();
     }

 }

第二步：在hibernate.cfg.xml文件中引入这两个po类

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

第三步：编写测试代码

 package com.qcf.test;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.Transaction;
 import org.hibernate.cfg.AnnotationConfiguration;
 import org.hibernate.cfg.Configuration;

 import com.qcf.pox.Address;
 import com.qcf.pox.Company;

 public class TestOneToOne {
     public static void main(String[] args) {
         Configuration configuration=new AnnotationConfiguration().configure();
         SessionFactory factory=configuration.buildSessionFactory();
         Session session=factory.openSession();
         Transaction transaction=session.beginTransaction();
         Address address=new Address();
         address.setName("beijing");
         Company company=new Company();
         address.setCompany(company);
         company.setName("zhandaf");
         company.setAddress(address);
         session.save(address);
         session.save(company);
         transaction.commit();
         session.close();

     }

 }