采用spring配置文件直接配置多个数据源，指定某个路径下的mapper文件使用哪个数据源，分别配置事务管理

1. 不支持分布式事务，一个事务中不能操作多个数据源
2. 配置简单，但是不灵活
3. 适合两个数据库没有相关性的情况
4. 不适合master-slave性的多数据源的配置，需要根据业务类型进行细致配置，比如增删改在master上，不允许有主从同步时间延时的查询在master上，耗时查询在slave上等等

application-context.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:aop="http://www.springframework.org/schema/aop"
	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"
	xmlns:security="http://www.springframework.org/schema/security"
	xsi:schemaLocation="
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
		http://www.springframework.org/schema/security 
		http://www.springframework.org/schema/security/spring-security-3.2.xsd
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-4.0.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">
 
	<!-- Activates annotation-based bean configuration -->
	<context:annotation-config />
 
	<!-- Scans for application @Components to deploy -->
	<context:component-scan base-package="com.gxx.record" />
 
	<!-- 数据库配置文件位置 -->
	<context:property-placeholder location="classpath:/jdbc.properties,classpath:/redis.properties,classpath:/memcached.properties,classpath:/mongodb.properties,classpath:/activemq.properties" />
 
	<!-- 主库配置 -->
	<!-- 使用JDBC事务 -->
	<bean id="master_transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="master_dataSource" />
	</bean>
 
	<!-- AOP配置事物 -->
	<tx:advice id="master_transactionAdvice" transaction-manager="master_transactionManager">
		<tx:attributes>
			<tx:method name="query*" read-only="true" propagation="REQUIRED" />
			<tx:method name="delete*"  propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="*" propagation="REQUIRED" />
		</tx:attributes>
	</tx:advice>
 
	<!-- 配置AOP切面 -->
	<aop:config>
        <aop:pointcut id="master_transactionPointcut" expression="execution(* com.gxx.record.service.master.impl.*.*(..))"/>
        <aop:advisor pointcut-ref="master_transactionPointcut" advice-ref="master_transactionAdvice"/>
    </aop:config>
 
 
	<!-- 使用annotation注解方式配置事务 -->
	<tx:annotation-driven transaction-manager="master_transactionManager" />
 
	<bean id="master_sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="master_dataSource" />
		<property name="configLocation" value="classpath:mybatis.xml"></property>
		<property name="mapperLocations" value="classpath:com/gxx/record/base/master/mapping/*.xml"></property>
	</bean>
 
	<!-- 配置SQLSession模板 -->
	<bean id="master_sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg index="0" ref="master_sqlSessionFactory" />
	</bean>
 
	<!--扫描basePackage下所有以@Repository注解的接口  -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="master_sqlSessionFactory" />
        <property name="basePackage" value="com.gxx.record.base.master"/>
        <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
    </bean>
 
    <!-- 从库配置 -->
	<!-- 使用JDBC事务 -->
	<bean id="slave_transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="slave_dataSource" />
	</bean>
 
	<!-- AOP配置事物 -->
	<tx:advice id="slave_transactionAdvice" transaction-manager="slave_transactionManager">
		<tx:attributes>
			<tx:method name="query*" read-only="true" propagation="REQUIRED" />
			<tx:method name="delete*"  propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="*" propagation="REQUIRED" />
		</tx:attributes>
	</tx:advice>
 
	<!-- 配置AOP切面 -->
	<aop:config>
        <aop:pointcut id="slave_transactionPointcut" expression="execution(* com.gxx.record.service.slave.impl.*.*(..))"/>
        <aop:advisor pointcut-ref="slave_transactionPointcut" advice-ref="slave_transactionAdvice"/>
    </aop:config>
 
 
	<!-- 使用annotation注解方式配置事务 -->
	<tx:annotation-driven transaction-manager="slave_transactionManager" />
 
	<bean id="slave_sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="slave_dataSource" />
		<property name="configLocation" value="classpath:mybatis.xml"></property>
		<property name="mapperLocations" value="classpath:com/gxx/record/base/slave/mapping/*.xml"></property>
	</bean>
 
	<!-- 配置SQLSession模板 -->
	<bean id="slave_sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg index="0" ref="slave_sqlSessionFactory" />
	</bean>
 
	<!--扫描basePackage下所有以@Repository注解的接口  -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="slave_sqlSessionFactory" />
        <property name="basePackage" value="com.gxx.record.base.slave"/>
        <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
    </bean>
 
</beans>

application-local-profile.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:p="http://www.springframework.org/schema/p"
	xmlns:jee="http://www.springframework.org/schema/jee" 
	xmlns:jdbc="http://www.springframework.org/schema/jdbc" 
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 			
				http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
				http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
 
	<description>数据源配置,主要用于开发测试环境 </description>
	<!-- 配置dbcp数据源 -->
	<bean id="master_dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="${master.local.jdbc.driverClassName}" />
		<property name="url" value="${master.local.jdbc.url}" />
		<property name="username" value="${master.local.jdbc.username}" />
		<property name="password" value="${master.local.jdbc.password}" />
	</bean>
	<bean id="slave_dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="${slave.local.jdbc.driverClassName}" />
		<property name="url" value="${slave.local.jdbc.url}" />
		<property name="username" value="${slave.local.jdbc.username}" />
		<property name="password" value="${slave.local.jdbc.password}" />
	</bean>
 
</beans>

application-test-profile.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:jee="http://www.springframework.org/schema/jee"
		xmlns:context="http://www.springframework.org/schema/context"
		xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 			
				http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
 
	<description>JNDI数据源,在生产环境使用应用服务器的数据库连接池</description>
	<!-- 配置jndi数据源 -->
	<jee:jndi-lookup id="master_dataSource" jndi-name="RECORD_DS_MASTER" />
	<jee:jndi-lookup id="slave_dataSource" jndi-name="RECORD_DS_SLAVE" />
</beans>

jdbc.properties

#本地环境主数据源
master.local.jdbc.driverClassName=com.mysql.jdbc.Driver
master.local.jdbc.url=jdbc:mysql://127.0.0.1:3306/record?useUnicode=true&characterEncoding=UTF-8&useOldAlias
master.local.jdbc.username=root
master.local.jdbc.password=root
 
#本地环境备数据源
slave.local.jdbc.driverClassName=com.mysql.jdbc.Driver
slave.local.jdbc.url=jdbc:mysql://127.0.0.1:3306/record_slave?useUnicode=true&characterEncoding=UTF-8&useOldAlias
slave.local.jdbc.username=root
slave.local.jdbc.password=root