Hibernate one-to-many 多方单向连接表关联

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Hibernate
one-to-many
join

Hibernate one-to-many join

　　Hibernate中持久化实体间一对多关联，具体关联关系为多方，单向，连接表关联。

　　一。Husband

package com.dream.model.couple;

import java.util.Set;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午3:53
 */
public class Husband {
    private Integer id;
    private String name;

    public Husband(String name) {
        this.name = name;
    }

    public Husband() {
    }
}

<?xml version="1.0" encoding="UTF-8"?>

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

<hibernate-mapping default-access="field">

    <class name="com.dream.model.couple.Husband" table="husband" dynamic-insert="true" dynamic-update="true">
        <id name="id" column="id" type="java.lang.Integer">
            <generator class="native"/>
        </id>
        <property name="name" column="name" type="java.lang.String"/>
    </class>

</hibernate-mapping>

　　二。Wife

package com.dream.model.couple;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午3:52
 */
public class Wife {
    private Integer id;
    private String name;

    private Husband husband;

    public Wife(String name) {
        this.name = name;
    }

    public Wife() {
    }

    public Wife(String name, Husband husband) {
        this.name = name;
        this.husband = husband;
    }

    public String name() {
        return this.name;
    }
}

<?xml version="1.0" encoding="UTF-8"?>

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

<hibernate-mapping default-access="field">

    <class name="com.dream.model.couple.Wife" table="wife" dynamic-insert="true" dynamic-update="true">
        <id name="id" column="id" type="java.lang.Integer">
            <generator class="native"/>
        </id>
        <property name="name" column="name" type="java.lang.String"/>

        <join table="couple">
            <key column="wifeid"/>
            <many-to-one name="husband" column="husbandid" class="com.dream.model.couple.Husband"/>
        </join>
    </class>

</hibernate-mapping>

　　三。CoupleDao

package com.dream.dao.standard;

import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午4:24
 */
public interface CoupleDao {

    void saveOrUpdateHusband(Husband husband);

    List<Husband> findHusbandsByName(String name);

    void saveOrUpdateWife(Wife wife);
}

package com.dream.dao;

import com.dream.dao.standard.CoupleDao;
import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午4:24
 */
public class CoupleDaoImpl extends HibernateDaoSupport implements CoupleDao {

    @Override
    public void saveOrUpdateHusband(Husband husband) {
        getHibernateTemplate().saveOrUpdate(husband);
    }

    @Override
    public List<Husband> findHusbandsByName(String name) {
        return getHibernateTemplate().find("from Husband husband where husband.name=?", name);
    }

    @Override
    public void saveOrUpdateWife(Wife wife) {
        getHibernateTemplate().saveOrUpdate(wife);
    }
}

　　四。CoupleService

package com.dream.service.standard;

import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午4:23
 */
public interface CoupleService {

    void saveOrUpdateHusband(Husband husband);

    List<Husband> loadHusbandsByName(String name);

    void saveOrUpdateWife(Wife wife);
}

package com.dream.service;

import com.dream.dao.standard.CoupleDao;
import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;
import com.dream.service.standard.CoupleService;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午4:23
 */
public class CoupleServiceImpl implements CoupleService {

    private CoupleDao coupleDao;

    @Override
    public void saveOrUpdateHusband(Husband husband) {
        coupleDao.saveOrUpdateHusband(husband);
    }

    @Override
    public List<Husband> loadHusbandsByName(String name) {
        return coupleDao.findHusbandsByName(name);
    }

    @Override
    public void saveOrUpdateWife(Wife wife) {
        coupleDao.saveOrUpdateWife(wife);
    }

    public void setCoupleDao(CoupleDao coupleDao) {
        this.coupleDao = coupleDao;
    }

}

　　五。testDB

db.url=jdbc:mysql://localhost:3306/couple?createDatabaseIfNotExist=true&amp;useUnicode=true&amp;characterEncoding=utf-8

db.driver=com.mysql.jdbc.Driver

db.username=root

db.password=root

hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

hibernate.show_sql=true

hibernate.hbm2ddl.auto=update

hibernate.jdbc.batch_size=100

　　六。testDataSource

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"
       default-autowire="byName">

    <context:property-placeholder location="classpath:testDB.properties"/>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mappingLocations">
            <list>
                <value>classpath:/hibernate_mappings/Husband.hbm.xml</value>
                <value>classpath:/hibernate_mappings/Wife.hbm.xml</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
                <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
                <prop key="hibernate.jdbc.batch_size">${hibernate.jdbc.batch_size}</prop>
            </props>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <aop:config>
        <aop:pointcut id="service" expression="execution(* com.dream.service..*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="service"/>
    </aop:config>

    <bean id="coupleDao" class="com.dream.dao.CoupleDaoImpl">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <bean id="coupleService" class="com.dream.service.CoupleServiceImpl">
        <property name="coupleDao" ref="coupleDao"/>
    </bean>
</beans>

　　七。Test

package com.dream.couple;

import com.dream.model.couple.Husband;
import com.dream.model.couple.Wife;
import com.dream.service.standard.CoupleService;
import junit.framework.TestCase;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-10-15
 * Time: 下午4:10
 */
public class HibernateOneToManyJoinTest extends TestCase {
    private CoupleService coupleService;

    @Override
    public void setUp() throws Exception {
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath:testDataSource.xml");
        coupleService = (CoupleService) context.getBean("coupleService");
    }

    public void testOneToOneJoin() throws Exception {

        Husband husband = new Husband("husband");
        coupleService.saveOrUpdateHusband(husband);

        Wife wife1 = new Wife("wife1", husband);
        coupleService.saveOrUpdateWife(wife1);

        Wife wife2 = new Wife("wife2", husband);
        coupleService.saveOrUpdateWife(wife2);

        Wife wife3 = new Wife("wife3", husband);
        coupleService.saveOrUpdateWife(wife3);
    }
}

　　跑完测试，发出的sql语句

　　 result