hibernate--一对一单（双）向外键关联

1、annotation进行注解：

实体类Husband.java：

package com.bean; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToOne; @Entity public class Husband { private int id; private String name; private Wife wife; @Id @GeneratedValue 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; } @OneToOne public Wife getWife() { return wife; } public void setWife(Wife wife) { this.wife = wife; } } Wife.java:

package com.bean; import javax.persistence.Entity; import javax.persistence.Id; @Entity public class Wife { private int id; private String name; @Id 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; } } cfg.xml配置：

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/user</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="show_sql">true</property> <property name="hbm2ddl.auto">update</property> <property name="show_sql">true</property> <property name="format_sql">true</property> <property name="current_session_context_class">thread</property> <mapping class="com.bean.Husband"/> <mapping class="com.bean.Wife"/> </session-factory> </hibernate-configuration> 2、通过XML进行配置：(一对一)  通过唯一性约束完成

Husband.hbm,xml:

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name = "com.bean.Husband" table = "Husband" > <id name = "id" column="id"> <generator class="native"/> </id> <property name="name" /> <many-to-one name="wife" unique="true" class="com.bean.Husband" column="wife_id"/> </class> </hibernate-mapping> Wife.hbm.xml:

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name = "com.bean.Wife" table = "Wife" > <id name = "id" column="wife_id"> <generator class="native"/> </id> <property name="name" /> </class> </hibernate-mapping> cfg.xml中映射：

<mapping resource="com/bean/Husband.hbm.xml"/> <mapping resource="com/bean/Wife.hbm.xml"/> 一对一双向外键关联：

XML配置参考帮助文档，<one-to-one property-ref>

annotation注解：

修改person类即可：

@Entity public class Person { private int id; private String name; private PersonID personID; @OneToOne(mappedBy="person") public PersonID getPersonID() { return personID; }对于双向外键关联，一定得注解@OneToOne(mappedBy="person") ，因为数据库中单向即可！