hibernate---一对一单向外键关联--annotation (重要!!!)

1. 生成wife.java:

package com.bjsxt.hibernate;

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

@Entity
public class Wife {
	private int id;
	private String name;

	@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;
	}
}

2. 生成husband.java, 指定:

@OneToOne
@JoinColumn(name="wifeId")

package com.bjsxt.hibernate;

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;
	}
}

3. hibernate.cfg.xml里设定:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/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/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">linda0213</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
       <!--
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:SXT</property>
        <property name="connection.username">scott</property>
        <property name="connection.password">tiger</property>
      	<property name="dialect">org.hibernate.dialect.OracleDialect</property>
       -->

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</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.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 resource="com/bjsxt/hibernate/Student.hbm.xml"/> -->
<!--         <mapping resource="com/bjsxt/hibernate/StuIdCard.hbm.xml"/> -->
		<mapping class="com.bjsxt.hibernate.Husband"/>
		<mapping class="com.bjsxt.hibernate.Wife"/>

    </session-factory>

</hibernate-configuration>

测试文件:HibernateORMappingTest.java:

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class HibernateORMappingTest {
	private static SessionFactory sessionFactory;

	//@BeforeClass
	public static void beforeClass() {
			sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
	}
	//@AfterClass
	public static void afterClass() {
		sessionFactory.close();
	}

	@Test
	public void testSchemaExport() {
		new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
	}

	public static void main(String[] args) {
		beforeClass();
	}
}

5. run as-junit test, 查看结果, 成功生成onetoone的两个表:

08:36:00,681 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 -
    create table Husband (
        id integer not null auto_increment,
        name varchar(255),
        wifeId integer,
        primary key (id)
    )
08:36:00,850 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 -
    create table Wife (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )
08:36:00,937 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:303 -
    alter table Husband
        add index FKAEEA401B109E78ED (wifeId),
        add constraint FKAEEA401B109E78ED
        foreign key (wifeId)
        references Wife (id)
08:36:01,538  INFO org.hibernate.tool.hbm2ddl.SchemaExport:196 - schema export complete