<?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:p="http://www.springframework.org/schema/p"

    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"

    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"

    xsi:schemaLocation="

            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd

            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd

            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd

            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.2.xsd

            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">

    <!-- 原理：自动注入processor解析器，用来解析注解 -->

    <!-- <context:annotation-config/> -->

    <!-- 自动扫描包，也会自动注入解释器，所以不需要 context:annotation-config -->

    <context:component-scan base-package="news"></context:component-scan>

    <!-- 引入外部属性文件 -->

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

    <bean id="sessionFactory"

        class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">

        <!-- 注入连接池，包含了数据库用户名，密码等等信息 -->

        <property name="dataSource" ref="myDataSource" />

        <!-- 配置Hibernate的其他的属性 -->

        <property name="hibernateProperties">

            <props>

                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>

                <prop key="hibernate.show_sql">true</prop>

                <prop key="hibernate.format_sql">true</prop>

                <prop key="hibernate.connection.autocommit">false</prop>

                <!-- 开机自动生成表 -->

                <prop key="hibernate.hbm2ddl.auto">update</prop>

            </props>

        </property>

        <property name="mappingResources">

            <list>

                <value>news/entity/News.hbm.xml</value>

            </list>

        </property>

    </bean>

    <bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

        <property name="driverClass" value="${jdbc.driver}" />

        <property name="jdbcUrl" value="${jdbc.url}" />

        <property name="user" value="${jdbc.user}" />

        <property name="password" value="${jdbc.password}" />

        <!-- 每300秒检查所有连接池中的空闲连接 -->

        <property name="idleConnectionTestPeriod" value="300"></property>

        <!-- 最大空闲时间,900秒内未使用则连接被丢弃。若为0则永不丢弃 -->

        <property name="maxIdleTime" value="900"></property>

        <!-- 最大连接数 -->

        <property name="maxPoolSize" value="2"></property>

    </bean>

  　<!-- 配置spring的TransactionManager，名字为默认值 -->

    <bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">

        <property name="sessionFactory" ref="sessionFactory"></property>

    </bean>

　  <!-- 开启事务控制的注解支持 -->

    <!--用@Transactional 注解替代tx/aop命名空间  来实现 Spring声明式事务管理-->

    <!--在service类上使用注解@Transactional -->

    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

//在service类上的注解

@Transactional

@Service

@Scope("prototype")

public class NewsServiceImpl implements NewsService {

    @Autowired

    private NewsDao nd;

    @Override

    @Transactional(readOnly=true)  //为方法增加事务处理特性
    public List showAllNews() { 

        List<News> allNewList = nd.showAllNews(); 
        return allNewList;
    }