hibernate1对1外键关联（单向）

引用

注解形式

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;
	}
	
}

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;
	}
	
}

hibernate.cfg.xml

<?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">bjsxt</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>

引用

xml形式

package com.bjsxt.hibernate;

public class StuIdCard {
	private int id;
	private String num;
	private Student student;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getNum() {
		return num;
	}
	public void setNum(String num) {
		this.num = num;
	}
	public Student getStudent() {
		return student;
	}
	public void setStudent(Student student) {
		this.student = student;
	}
	
}

package com.bjsxt.hibernate;

public class Student {
	
	private int id;
	private String name;
	
	private int age;
	private String sex;
	private boolean good;
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
	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;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	
	
	
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.bjsxt.hibernate.Student" dynamic-update="true">
		<id name="id">
			<generator class="native"></generator>
		</id>
		
		<property name="name"></property>
		<property name="age" />
		<property name="sex" />
		<property name="good" type="yes_no"></property>
    </class>
	
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.bjsxt.hibernate.StuIdCard">
		<id name="id">
			<generator class="native"></generator>
		</id>
		
		<property name="num"/>
		<many-to-one name="student" column="studentId" unique="true"></many-to-one>
    </class>
	
</hibernate-mapping>

引用

测试

public class TestHibernate extends TestCase {
	private static SessionFactory sessionFactory;

	/* (non-Javadoc)    
	 * @see junit.framework.TestCase#setUp()    
	 */
	protected void setUp() throws Exception {
		sessionFactory = new AnnotationConfiguration().configure()
				.buildSessionFactory();
	}

	/* (non-Javadoc)    
	 * @see junit.framework.TestCase#tearDown()    
	 */
	protected void tearDown() throws Exception {
		sessionFactory.close();
	}
	public void testSchemaExport() {
		new SchemaExport(new AnnotationConfiguration().configure()).create(
				false, true);
	}

}

[img]  drop table if exists StuIdCard
23:54:47,765 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:377 -
    drop table if exists Student
23:54:47,765 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:377 -
    create table StuIdCard (
        id integer not null,
        num varchar(255),
        primary key (id)
    )
23:54:47,859 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:377 -
    create table Student (
        id integer not null auto_increment,
        name varchar(255),
        age integer,
        sex varchar(255),
        good char(1),
        primary key (id)
    )
23:54:47,968 DEBUG org.hibernate.tool.hbm2ddl.SchemaExport:377 -
    alter table StuIdCard
        add index FKD3A449FFEC65FB66 (id),
        add constraint FKD3A449FFEC65FB66
        foreign key (id)
        references Student (id)
23:54:48,156  INFO org.hibernate.tool.hbm2ddl.SchemaExport:268 - schema export complete[/img]