`
Wind_ZhongGang
  • 浏览: 264749 次
  • 性别: Icon_minigender_1
  • 来自: 成都
社区版块
存档分类
最新评论

Hibernate one-to-many 多方单向连接表关联

阅读更多

 

 

  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

 

  来看看跑完测试后,数据库中相关的数据表及数据:

 

  result1

 

  result2

 

  • 大小: 13.7 KB
  • 大小: 17.2 KB
  • 大小: 8.4 KB
0
0
分享到:
评论

相关推荐

    hibernate的关联映射

    关联映射主要包括四种类型:一对一(One-to-One)、一对多(One-to-Many)、多对一(Many-to-One)和多对多(Many-to-Many)。下面我们将逐一探讨这些关联映射的配置方法。 1. **一对一关联映射** - **主键关联**...

    Hibernate性能调优

    关联通常包括以下几种类型:单向`one-to-many`关联、双向`one-to-many`关联、`many-to-one`关联以及`one-to-one`关联。 ##### 单向`one-to-many`关联 - **定义**:单向`one-to-many`关联是指一个实体可以拥有多个...

    Hibernate关联关系映射目录

    在多对多单向关联中,两个实体之间可以相互关联,这种关联通常通过第三个表(连接表或关联表)来实现。 **表结构示例**: - **Student表**: - `studentid`: 主键 - `name`: 姓名 - `age`: 年龄 - **Course表**:...

    Hibernate关联映射

    配置上,需要创建一个新的实体类来代表连接表,并在其中定义两个 `many-to-one` 属性,分别对应一对一关联的两个实体。 4. Hibernate 一对多外键单向关联: 在这种关联中,一个实体类(如 Department)可以有多个...

    hibernate实体关联关系映射

    2. **一对多关联**(One-to-Many / Many-to-One) - 外键单向关联 - 连接表单向关联 - 外键双向关联 - 连接表双向关联 3. **多对多关联**(Many-to-Many) - 单向关联 - 双向关联 每种关联类型都有其特定的...

    HIbernate关联关系总结

    如果是通过连接表实现1-N关联,我们需要使用`&lt;many-to-many&gt;`标签,并设置`unique=true`来限制一对多的关系。连接表的配置需要在`&lt;set&gt;`标签中指定`table`属性。 **优点**:1端可以方便地管理和操作N端的所有对象...

    hibernate关联映射

    在Person类中添加`private Address address`属性,并在`person.hbm.xml`中配置`&lt;many-to-one&gt;`元素,如`&lt;many-to-one name="address" cascade="all" class="Address" column="address_id"/&gt;`。这表示Person表中的...

    hibernate中的关联关系

    - 在 `Person` 类中添加 `Address` 属性,并在映射文件中使用 `&lt;one-to-one&gt;` 或 `&lt;many-to-one&gt;` 进行关联映射。 --- 以上介绍的是 Hibernate 中一对一关联关系的三种不同方式,包括一对一连接表单向关联、一对...

    Hibernate中的关联映射

    &lt;many-to-one name="address" class="Address" column="address_id"/&gt; ``` - **基于PK**:同样只有一方包含了另一方的引用关联实体属性,但这里通过使用外键作为主键的一部分来实现。 - **映射示例**: ```xml ...

    Hibernate关联关系总结

    **多对一关联(Many-to-One)** 多对一关联是一对一关联的反转,即多个实体对应一个实体。例如,多个员工可以属于同一个部门。这种关系可以通过`@ManyToOne`注解实现。多对一关联的一方通常会包含对另一方的引用,而...

    hibrenate xml 配置 映射

    这使用`&lt;many-to-one&gt;`标签。 ```xml &lt;many-to-one name="address" class="com.example.Address" column="address_id"/&gt; ``` #### 2.1.7 多对一连接表单向关联 与上述相同,但通过连接表进行关联。 #### 2.1.8 多...

    Hibernate笔记

    对于无连接表的N-1关联,我们可以在实体类的`Person`中添加`Address`对象,并在配置文件中设置`&lt;many-to-one&gt;`标签,指定外键列。而有连接表的N-1关联则需要使用`&lt;join&gt;`元素,通过连接表来建立关联。 B. 单向1-1...

    hibernate多对多单向关联

    在Java的持久化框架Hibernate中,多对多(Many-to-Many)关联是一种常见的关系映射类型,它用于表示两个实体之间可以有多个对应的关系。本文将深入探讨Hibernate中的多对多单向关联,并结合提供的资源`hibernate_...

    hibernate_reference中文文档.pdf

    - **7.3.2 多对一 (many-to-one)**:介绍使用连接表的多对一关联映射。 - **7.3.3 一对一 (One-to-one)**:说明使用连接表的一对一关联映射。 - **7.3.4 多对多 (many-to-many)**:解释多对多关联的映射。 - **...

    Hibernate数据关联实现〖MVSN〗_Struts + DAO + Hibernate

    在Hibernate中,数据关联分为一对一(One-to-One)、一对多(One-to-Many)、多对一(Many-to-One)和多对多(Many-to-Many)四种类型。每种关联都需要在实体类(Entity)上通过注解进行配置,例如: 1. **一对一...

    hibernate映射关系

    本文将深入探讨Hibernate中的三种主要映射关系:一对一(One-to-One)、一对多(One-to-Many)以及多对多(Many-to-Many)。 ### 一对一映射(One-to-One) 一对一映射在现实世界中非常常见,例如一个人只有一个...

    hibernateByXML

    - `many-to-one`元素用于表示多方对一方的关系。 **单向关联**: **XML配置**: ```xml &lt;!-- 部门的映射文件 --&gt; &lt;hibernate-mapping&gt; &lt;one-to-many class="com.example.Employee"/&gt; &lt;/...

Global site tag (gtag.js) - Google Analytics