有时候在一个项目中会连接多个数据库,需要在spring中配置多个数据源,最近就遇到了这个问题,由于我的项目之前是基于通用Dao的，配置的时候问题不断，这种方式和资源文件冲突；扫描映射文件的话，SqlSessionFactory的bean名字必须是sqlSessionFactory 他读不到sqlSessioNFactory2或者其他名字,最终解决方法如下：
1.在项目中加入如下类MultipleDataSource.java
package com.etoak.util;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class MultipleDataSource extends AbstractRoutingDataSource {
private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>();
public static void setDataSourceKey(String dataSource) {
dataSourceKey.set(dataSource);
}
@Override
protected Object determineCurrentLookupKey() {
// TODO Auto-generated method stub
return dataSourceKey.get();
}
}
spring配置文件如下：
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-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/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<context:component-scan base-package="com"/>
<mvc:annotation-driven/>
<context:property-placeholder location="classpath:db.properties"/>
<bean id="ds1" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${mysql.driver}"
p:url="${mysql.url}"
p:username="${mysql.username}"
p:password="${mysql.password}"/>
<bean id="ds2" class="org.springframework.jdbc.datasource.DriverManagerDataSource"
p:driverClassName="${mysql2.driver}"
p:url="${mysql2.url}"
p:username="${mysql2.username}"
p:password="${mysql2.password}"/>
<bean id="multipleDataSource" class="com.etoak.util.MultipleDataSource">
<property name="defaultTargetDataSource" ref="ds1"/>
<property name="targetDataSources">
<map>
<entry key="ds1" value-ref="ds1"/>
<entry key="ds2" value-ref="ds2"/>
</map>
</property>
</bean>
<bean id="sqlSessionFactory1" class="org.mybatis.spring.SqlSessionFactoryBean"
p:dataSource-ref="multipleDataSource"
p:mapperLocations="classpath:com/etoak/dao/*-mapper.xml"/>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.etoak.dao"/>
<property name="markerInterface" value="com.etoak.dao.BaseDao" />
</bean>
</beans>
测试类如下：
package com.etoak.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import com.etoak.dao.ProductDaoIf;
import com.etoak.util.MultipleDataSource;
public class Test {
public static void main(String[] args) {
ApplicationContext ac = new
FileSystemXmlApplicationContext("WebContent/WEB-INF/etoak-servlet.xml");
ProductDaoIf proDao = (ProductDaoIf)ac.getBean(ProductDaoIf.class);
MultipleDataSource.setDataSourceKey("ds1");
int count1 = proDao.selectProductCount();
MultipleDataSource.setDataSourceKey("ds2");
int count2 = proDao.selectProductCount();
System.out.println(count1);
System.out.println(count2);
}
}
