多个mapper location时, mybatis spring的自动扫描配置

1. MapperScannerConfigurer 里面的basePackage, 多个package用逗号分隔

2. SqlSessionFactoryBean里面的mapperLocations, 用<list><value></value>...</list>设置

例如:

<bean id="propertyConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:database.properties</value>
            </list>
        </property>
    </bean>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="poolPreparedStatements" value="true" />
        <property name="initialSize" value="1" />
        <property name="maxActive" value="20" />
        <property name="maxIdle" value="5" />
        <property name="validationQuery" value="select 1" /><!-- This one is for MySQL -->
        <!--<property name="validationQuery" value="select 1 from dual" /> This one is for Oracle -->
        <property name="testOnBorrow" value="true" />
        <property name="testWhileIdle" value="true" />
    </bean>

    <bean id="dataSourceLocal" parent="dataSource">
        <property name="driverClassName" value="${db.mysql.local.driver}" />
        <property name="url" value="${db.mysql.local.url}" />
        <property name="username" value="${db.mysql.local.user}" />
        <property name="password" value="${db.mysql.local.password}" />
    </bean>

    <!-- 当有多个数据源时, 自sqlSessionFactory, mapperScannerConfigurer 到 transactionmanager, 都要设置两套id -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.rockbb.facility.common.dao.mapper, com.rockbb.facility.weixin.dao.mapper" />
        <!-- 当只有一个数据源时,这行可以不写. -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSourceLocal" />
        <property name="mapperLocations">
            <list>
                <value>classpath:com/rockbb/facility/common/dao/mapper/*.xml</value>
                <value>classpath:com/rockbb/facility/weixin/dao/mapper/*.xml</value>
            </list>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSourceLocal" />
    </bean>

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

关于详细的配置项说明, 参考 http://haohaoxuexi.iteye.com/blog/1843309

当多个数据源都要使用事务时, 要这样定义

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

在代码中, 如果不显式指明使用哪个事务, 则默认使用先声明的那个, 本例中就是 transactionManagerA
显式指明使用哪个事务管理, 需要用这样的注解

@Transactional("transactionManagerB")
public void doSomething() {
    //....
}