Spring下mybatis多数据源配置(转)
Spring下mybatis多数据源配置
介绍
本文描述了以mybatis作为持久层框架使用Spring的声明式事务时，如何配置多个数据源（即连接多个数据库），使用Spring的注解方式迚行依赖的注入和事务的管理。并且利用mybatis的spring插件自动扫描和装配Mapper接口。
先来看一个mybatis的单数据源配置
<context:property-placeholder location="classpath:jdbc.properties" />
<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource">
<property name="alias" value="${alias}" />
<property name="driver" value="${driver}" />
<property name="driverUrl" value="${driverUrl}" />
<property name="user" value="${user}" />
<property name="password" value="${password}" />
<property name="houseKeepingTestSql" value="${house-keeping-test-sql}" />
<property name="maximumConnectionCount" value="${maximum-connection-count}" />
<property name="minimumConnectionCount" value="${minimum-connection-count}" />
<property name="prototypeCount" value="${prototype-count}" />
<property name="simultaneousBuildThrottle" value="${simultaneous-build-throttle}" />
<property name="trace" value="${trace}" />
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- 自动扫描mapper接口 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="rhinoceros.persistence.dao" />
</bean>
说明
1. 数据库连接池使用Proxool，首先配置的就是Proxool的数据源
2. 接下来配置Spring的声明式事务管理，这里我们使用全注解+自动装配的方式迚行Bena和事务声明。
3. mybatis配置为自动扫描Maper接口，只要指定Mapper接口所在的包，需要注意的是，Mapper接口对应的映射文件(.xml)也要在这个包里，且名字和接口的名字一致。
使用多个数据源时，mybatis的文档表示丌能使用自动扫描和自动装配，但实际使用时发现还是可以的。看一个配置文件先：
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- proxool连接池 -->
<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource">
<property name="alias" value="${alias}" />
<property name="driver" value="${driver}" />
<property name="driverUrl" value="${driverUrl}" />
<property name="user" value="${user}" />
<property name="password" value="${password}" />
<property name="houseKeepingTestSql" value="${house-keeping-test-sql}" />
<property name="maximumConnectionCount" value="${maximum-connection-count}" />
<property name="minimumConnectionCount" value="${minimum-connection-count}" />
<property name="prototypeCount" value="${prototype-count}" />
<property name="simultaneousBuildThrottle" value="${simultaneous-build-throttle}" />
<property name="trace" value="${trace}" />
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 注解式事务管理 -->
<tx:annotation-driven transaction-manager="transactionManager" />
<!-- 自动扫描 mybatis mapper接口 -->
<bean name="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="rhino.persistence.mapper" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
<!-- 配置新的的数据源 -->
<bean id="dataSource_1" class="org.logicalcobwebs.proxool.ProxoolDataSource">
<property name="alias" value="${db1.alias}" />
<property name="driver" value="${driver}" />
<property name="driverUrl" value="${db1.driverUrl}" />
<property name="user" value="${db1.user}" />
<property name="password" value="${db1.password}" />
<property name="houseKeepingTestSql" value="${house-keeping-test-sql}" />
<property name="maximumConnectionCount" value="${maximum-connection-count}" />
<property name="minimumConnectionCount" value="${minimum-connection-count}" />
<property name="prototypeCount" value="${prototype-count}" />
<property name="simultaneousBuildThrottle" value="${simultaneous-build-throttle}" />
<property name="trace" value="${trace}" />
</bean>
<bean id="sqlSessionFactory_1" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource_1" />
<property name="configLocation" value="classpath:mybatis-config-db1.xml"/>
</bean>
<bean id="transactionManager_1"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource_1" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager_1" />
<!-- 自动扫描 mybatis mapper接口 -->
<bean name="mapperScannerConfigurer_1" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value=rhino.persistence.db1" />
<property name="sqlSessionFactory" ref="sqlSessionFactory_1" />
</bean>
<!-- spring beans 组件扫描 -->
<context:component-scan base-package="rhino.domain" />
说明
1. 需要配置新的数据源、事务管理器、sqlSession工厂
2. mybatis配置文件也要独立出来，即2个数据源应该有2个mybatis配置文件，互相之间是独立的，注意配置sqlSessionFactory_1时注入的mybatis-config-db1.xml
3. Mapper接口要放在一个新的包里
4. 2个以上的数据源同样配置
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