spring+mybatis 配置文件

<?xml version="1.0" encoding="UTF-8" ?>   <beans xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:ehcache="http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring"xsi:schemaLocation="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/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">       <!-- 配置自动扫包，包括子包，不与springmvc扫描相同的包，如果扫描到有@Component @Controller@Service等这些注解的类，则把这些类注册为bean-->   <context:component-scan base-package="com.ylg.dao;com.ylg.bean;com.ylg.service"/>    <!-- 引入配置文件 此处为db.properties-->      <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">    <property name="location" value="classpath:db.properties">    </property>    </bean>        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">    <!-- 指定连接数据库的驱动 -->    <property name="driverClass" value="${driver}"/>    <property name="jdbcUrl" value="${url}"/>    <property name="user" value="${username}"/>    <property name="password" value="${passwd}"/>    <!-- 指定连接数据库连接池的最大连接数 -->    <property name="maxPoolSize" value="${maxPoolSize}"/>    <!-- 指定连接数据库连接池的最小连接数 -->    <property name="minPoolSize" value="${minPoolSize}"/>    <!-- 指定连接数据库连接池的初始化连接数 -->    <property name="initialPoolSize" value="${initialPoolSize}"/>    <!-- 指定连接数据库连接池的连接的最大空闲时间 -->    <property name="maxIdleTime" value="${maxIdleTime}"/>    <!-- 连接关闭时默认将所有未提交的操作回滚。默认：false -->    <property name="autoCommitOnClose" value="${autoCommitOnClose}"/>    <!-- 当连接用完时，等待获取新的连接，超时后将抛出SQLException,如果设置为0，则无限等待，单位毫秒，默认：0  -->    <property name="checkoutTimeout" value="${checkoutTimeout}"/>    <property name="acquireIncrement" value="${acquireIncrement}"/>    <property name="acquireRetryAttempts" value="${acquireRetryAttempts}"/>    </bean>        <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->      <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">    <property name="dataSource" ref="dataSource"/>    <!-- 自动扫描mapping.xml文件 -->      <property name="mapperLocations" value="classpath*:/config/mybatis/*Mapper.xml"/>    </bean>        <!-- Mapper接口所在包名，Spring会自动查找其下的Mapper -->      <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">    <property name="annotationClass" value="org.springframework.stereotype.Repository"/>    <property name="basePackage" value="com.ylg.dao"/>    </bean>        <!-- 由spring管理mybatis的事物 -->      <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">    <property name="dataSource" ref="dataSource"/>    </bean>        <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>  </beans>