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:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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 }
地址表:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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 }
第二步:在hibernate.cfg.xml文件中引入这两个po类
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 <mapping class="com.qcf.pox.Address"/> 2 <mapping class="com.qcf.pox.Company"/>
第三步:编写测试代码
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
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 }