package org.hibernate.tutorial.domain; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; 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 String getName() { return name; } @OneToOne @JoinColumn(name="wifeId") public Wife getWife() { return wife; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } public void setWife(Wife wife) { this.wife = wife; } }
package org.hibernate.tutorial.domain; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToOne; @Entity public class Wife { private int id; private String name; private Husband husband; @Id @GeneratedValue public int getId() { return id; } public String getName() { return name; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } @OneToOne(mappedBy="wife") public Husband getHusband() { return husband; } public void setHusband(Husband husband) { this.husband = husband; } }
hibernate.hb.xml
<?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> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=utf8</property> <property name="connection.username">root</property> <property name="connection.password">admin</property> <!-- JDBC connection pool (use the built-in) --> <!--<property name="connection.pool_size">1</property>--> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- Drop and re-create the database schema on startup <property name="hbm2ddl.auto">update</property>--> <!-- <mapping class="org.hibernate.tutorial.domain.Wife"/> <mapping resource="org/hibernate/tutorial/domain/Husband.hbm.xml"/> --> <mapping class="org.hibernate.tutorial.domain.Husband"/> <mapping class="org.hibernate.tutorial.domain.Wife"/> </session-factory> </hibernate-configuration>
测试
package com.test; import org.hibernate.cfg.AnnotationConfiguration; import org.hibernate.tool.hbm2ddl.SchemaExport; public class OneToOneORMappingTest { public static void main(String[] args) { new SchemaExport(new AnnotationConfiguration().configure("/hibernate.cfg.xml")).create(true, false); } }
解释: @OneToOne(mappedBy="wife") 是设置以对方为主导生成外键,只在对方表生成外键列。是当前类对象Wife的husband属性中wife属性