Hibernate annotations one2one with WithExplicitFk 单向一对一有外键-优快云博客

本文介绍Hibernate中一对一关联关系的实现方式，通过示例代码展示了Client类与Address类之间的关联映射，包括实体类定义及测试过程。

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Client 的代码：

//$Id: Client.java 11282 2007-03-14 22:05:59Z epbernard $
package org.hibernate.test.annotations.onetoone;

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

/**
* @author Emmanuel Bernard
*/
@Entity
public class Client {

private Integer id;
private String name;
private Address address;

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "ADDRESS_ID")

public Address getAddress() {
return address;
}

public void setAddress(Address address) {
this.address = address;
}

@Id
@GeneratedValue
public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}

其中 @JoinColumn(name = "ADDRESS_ID") 指定外键名称为 ADDRESS_ID

Address 的代码：

//$Id: Address.java 11282 2007-03-14 22:05:59Z epbernard $
package org.hibernate.test.annotations.onetoone;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

/**
* @author Emmanuel Bernard
*/
@Entity
public class Address {

private Integer id;
private String city;

@Id
@GeneratedValue
public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getCity() {
return city;
}

public void setCity(String city) {
this.city = city;
}
}

测试代码如下：

  Client c = new Client();
  Address a = new Address();
  a.setCity( "Paris" );
  c.setName( "Emmanuel" );
  c.setAddress( a );

  Session s;
  Transaction tx;
  s = openSession();
  tx = s.beginTransaction();
  s.persist( c );
  tx.commit();
  s.close();

  s = openSession();
  tx = s.beginTransaction();
  c = (Client) s.get( Client.class, c.getId() );
  assertNotNull( c );
  assertNotNull( c.getAddress() );
  assertEquals( "Paris", c.getAddress().getCity() );
  tx.commit();
  s.close();

其他配置请参考我的前几篇文章。

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