在实际应用场景中会遇到一个项目连接多个数据库的情况，下面来做一个简单的配置。
作者在开发过程中把数据库的配置放在了properties文件中，如图：
spring-mybatis配置放在了了spring-dao.xml文件中
<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <context:property-placeholder ignore-unresolvable="true" location="classpath:jdbc.properties"/> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" > <property name="driverClass" value="${jdbc.driver}" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <property name="autoCommitOnClose" value="false"/> <property name="checkoutTimeout" value="10000"/> <property name="acquireRetryAttempts" value="2"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:mybatis-config.xml"/> <property name="typeAliasesPackage" value="com.senxing.po"/> <property name="mapperLocations" value="classpath:mapper/*xml"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <property name="basePackage" value="com.senxing.dao"/> </bean> <!--第二个数据源配置--> <bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource" > <property name="driverClass" value="${jdbc.test.driver}" /> <property name="jdbcUrl" value="${jdbc.test.url}" /> <property name="user" value="${jdbc.test.username}" /> <property name="password" value="${jdbc.test.password}" /> <property name="maxPoolSize" value="30"/> <property name="minPoolSize" value="10"/> <property name="autoCommitOnClose" value="false"/> <property name="checkoutTimeout" value="10000"/> <property name="acquireRetryAttempts" value="2"/> </bean> <bean id="sqlSessionFactory1" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource2"/> <property name="configLocation" value="classpath:mybatis-config.xml"/> <property name="typeAliasesPackage" value="com.senxing.po"/> <property name="mapperLocations" value="classpath:mapper/backdao/*xml"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory1"/> <property name="basePackage" value="com.senxing.backdao"/> </bean> </beans>
如上所示，我们分别配置了两个 dataSource，两个sqlSessionFactory，关键的地方在于MapperScannerConfigurer 的配置——使用sqlSessionFactoryBeanName属性，注入不同的sqlSessionFactory的名称，这样的话，就为不同的数据库对应的 mapper 接口注入了对应的 sqlSessionFactory。
现在就可以用了
原文：https://www.cnblogs.com/gaoweifeng/p/12156614.html