Spring+Mybatis 多数据源配置

同一applicationContext.xml中：1，配置多个数据源(采用连接池c3p0，直接jdbc连也行)数据源1：dataSource1<bean id = "dataSource1" class= "com.mchange.v2.c3p0.ComboPooledDataSource" lazy-init = "default"><property name="driverClass" value = ""/>......</bean>数据源2：dataSource2<bean id = "dataSource2" class= "com.mchange.v2.c3p0.ComboPooledDataSource" lazy-init = "default"><property name="driverClass" value = ""/>......</bean>2, 配置mybatis数据会话管理（sqlSessionFactoryBean）会话factory1：sqlSessionFactoryBean1<bean id = "sqlSessionFactoryBean1" class = "mybatis.spring.SqlSessionFactoryBean"><property name = "mapperLocations"><list>//不同factory，尽量保持其mapper的路径不同<value>classpath:mapper/*Mapper.xml</value> //classpath指的是：src/main/resources(maven项目文件包结构哦)</list></property><property name = "dataSource" ref = "dataSource1"></property></bean>会话factory2：sqlSessionFactoryBean2<bean id = "sqlSessionFactoryBean2" class = "mybatis.spring.SqlSessionFactoryBean"><property name = "mapperLocations"><list><value>classpath:mapper/*Mapper.xml</value> </list></property><property name = "dataSource" ref = "dataSource2"></property></bean>3， 配置Dao接口层（重点注意）mybatis用mapperScannerConfigurer扫描相关的dao(或mapper)的interface的包，将其注入到spring进行管理；dao层需要注入第2步配置的sessionFactory来获得session(session中加入事物等操作)，跟sessionFactory中配置的*Mapper.xml进行一一匹配；mapperScanner1:<bean id="mapperScanner1" class="org.mybatis.spring.mapper.MapperScannerConfigurer">//不同数据源的扫描dao层不要放在一起，不然数据源1扫描了数据源2的dao，那 去数据源1的mappe.xml中匹配时，会找不到相应方法，而报错！！！<property name = "basePackage" value = "com.business.*.*dao1"/> //配置dao层需注入的sessionFactory
<property name = "sqlSessionFactoryBeanName" value = "sqlSessionFactoryBean1"/></bean>mapperScanner2:<bean id="mapperScanner2" class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name = "basePackage" value = "com.business.*.*dao2"/> <property name = "sqlSessionFactoryBeanName" value = "sqlSessionFactoryBean2"/></bean>
其他配置：事物配置（dataSourceTransactionManager）,持久化模板（SqlSessionTemplate）
常见错误1：No unique bean of type [org.apache.ibatis.sessioin.SqlSessionFactory] is defined:expected single matching bean but found 2:[sqlSessionFactoryBean1,sqlSessionFactoryBean2]解决问题：检查步骤3配置，是否有配置sqlSessionFactoryBeanName
常见错误2：...Dao conflicts with existing, non-compatible bean definition of same name and class[org.mybatis.spring.mapper.MapperFactoryBean]解决问题：检查步骤3配置，属性basePackage，两个数据源是否扫描了同一dao层包，若是，更改dao层包，不同数据源需扫描不同的dao层包。
参考：http://stackoverflow.com/questions/4746766/spring-and-mybatis-multiple-data-sources-setupSpringBoot 版本多数据源实现：https://blog.csdn.net/neosmith/article/details/61202084github代码实现：https://github.com/Wangdali123/springboot-datasources动态切换填坑版完整代码：http://blog.csdn.net/xiazai353503200/article/details/79390879