Spring与Hibernate整合

Spring与Struts2整合的目的：

让Spring管理Action

Spring整合Hinernate的目的：

--管理SessionFactory(单例的)，数据源

--声明式事务管理

1.首先建一个java项目接可以了

单独加Hibernate的开发环境：jar包和配置文件(hibernate.cfg.xml和xxx.hbm.xml)

hibernate.cfg.xml里面包含三类信息：数据库连接信息，其他信息，映射信息(这是未整合时的情况)

public class User {
    private Integer id;
    private String name;
    private Integer age;

    public User() {

    }

    public User(Integer id, String name, Integer age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

User.hbm.xml

<?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 package="com.winner.entity">

    <class name="User" table="t_user">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="name"/>
        <property name="age"/>
    </class>

</hibernate-mapping>

hibernate.cfg.xml

<!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>
        <!-- 1，数据库连接信息 -->
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <property name="connection.url">jdbc:mysql:///sh</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- 2，其他配置 -->
        <property name="hibernate.show_sql">true</property>
        <property name="hbm2ddl.auto">update</property>

        <!-- 3，导入映射配置 -->
        <mapping resource="com/winner/entity/User.hbm.xml"/>

    </session-factory>
</hibernate-configuration>

单独加Spring的开发环境:jar包和配置文件applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-2.5.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd ">
</beans>

下面开始整合，

一、整合的第一步

让Spring容器管理SessionFactory.

方法一：不建议，应该使用专业 的数据库连接池

<!-- 配置SessionFactory，方式一：指定hibernate主配置文件的路径 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="configLocation" value="classpath:hibernate.cfg.xml"/>
</bean>

方法二：建议，这种情况下不需要hibernate.cfg.xml文件了

数据源里面没有方言，需要在hibernateProperties里面配

<?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:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-2.5.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd ">

    <!-- 加载外部的配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 配置数据库连接池 ComboPooledDataSource -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 基本的连接信息 -->
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <property name="driverClass" value="${driverClass}"/>
        <property name="user" value="${username}"/>
        <property name="password" value="${password}"/>
        <!-- 一些管理的配置 -->
        <property name="initialPoolSize" value="3"></property>
        <property name="minPoolSize" value="3"></property>
        <property name="maxPoolSize" value="5"></property>
        <property name="acquireIncrement" value="3"></property>
        <property name="maxIdleTime" value="1800"></property>
    </bean>

    <!-- 配置SessionFactory，不使用Hibernate主配置文件，在这里写所有的Hibernate配置，这样就不需要hibernate的配置文件了-->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <!--hibernate的数据库连接信息-->
        <property name="dataSource" ref="dataSource"/>
        <!--hibernate其他配置-->
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql" >true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
        <!--映射配置-->
        <property name="mappingLocations">
            <list>
                <!--可以有多个-->
                <value>classpath:com/winner/entity/User.hbm.xml</value>
            </list>
        </property>
    </bean>
</beans>

其实下面这种方式其实也挺好的

<!-- 配置SessionFactory，方式三：结合使用 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>
</bean>

在这种情况下，像上面的xx.hbm.xml映射文件，show_sql等属性都可以保留在hibernate,cfg.xml文件中。

测试

public class SpringTest {

    private ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

    @Test
    public void testSessionFactory() {
        SessionFactory sessionFactory = (SessionFactory) ac.getBean("sessionFactory");
        System.out.println(sessionFactory);
    }
}

二、整合的第二步

配置声明式事务管理

<!-- 二、配置声明式事务管理，采用基于注解的方式 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <!--管理事务肯定离不开session，进而需要sessionFactory-->
    <property name="sessionFactory" ref="sessionFactory"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>

测试事务是否起作用

--能不能正常提交

@Service
public class UserService {

    @Resource
    private SessionFactory sessionFactory;

    @Transactional
    public void saveTwoUsers() {
        Session session = sessionFactory.getCurrentSession();
        session.save(new User());
        session.save(new User());

    }
}

// 测试事务
@Test
public void testTransaction() throws Exception {
    UserService userService = (UserService) ac.getBean("userService");
    userService.saveTwoUsers();
}

Hibernate: insert into t_user (name, age) values (?, ?)
Hibernate: insert into t_user (name, age) values (?, ?)

--有异常能不能回滚

@Service
public class UserService {

    @Resource
    private SessionFactory sessionFactory;

    @Transactional
    public void saveTwoUsers() {
        Session session = sessionFactory.getCurrentSession();
        session.save(new User());
        int i = 1 / 0;
        session.save(new User());

    }
}

Hibernate: insert into t_user (name, age) values (?, ?)
java.lang.ArithmeticException: / by zero

将异常语句去掉，在执行一次

看数据库

第三条被回滚掉了。