Spring JPA applicationContext.XML文件 配置

<?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:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    
    
    <!-- 配置自动扫描的包 -->
    <context:component-scan base-package="com">
    </context:component-scan>
    
    <!-- 配置数据源(数据库连接池) -->
    <context:property-placeholder location="classpath:db.properties"/>
    <bean id="dataSource"
        class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.user}"></property>    
        <property name="password" value="${jdbc.password}"></property>    
        <property name="driverClass" value="${jdbc.driverClass}"></property>    
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>    
    </bean>
    
    <!-- 配置 JPA 的 EntityManagerFactory  -->
    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"></property><!-- 添加数据源 -->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
        </property>    
        <property name="packagesToScan" value="com.entity"></property>
        <!-- hibernate 配置 -->
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.hbm2ddl.auto">none</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <!-- 方言 hibernate 并不知道自己要使用哪种数据库 -->
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
                <!--  
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
                <prop key="hibernate.cache.use_query_cache">true</prop>
                -->
            </props>
        </property>
        <!--  <property name="sharedCacheMode" value="ENABLE_SELECTIVE"></property>-->
    </bean>
    
    <!-- 配置事务 纯事物     jpa事物 -->
    <bean id="transactionManager"
        class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"></property>    
    </bean>
    
    <!-- 配置支持基于注解的事务 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
    <!-- 配置 SpringData -->
    <jpa:repositories base-package="com.dao"
        entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>
    
    
</beans>