Spring多数据源的动态切换
目前很多项目中只能配置单个数据源，那么如果有多个数据源肿么办？Spring提供了一个抽象类AbstractRoutingDataSource，为我们很方便的解决了这个问题。
1.写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法
public class DynamicDataSource extends AbstractRoutingDataSource{
private final static Logger logger = LoggerFactory.getLogger("DynamicDataSource");
@Override
protected Object determineCurrentLookupKey() {
return DbContextHolder.getDbType();
}
}
2.写一个线程安全的ThreadLocal
public class DbContextHolder {
private static final ThreadLocal contextHolder = new ThreadLocal();
public static void setDbType(String dbType) {
contextHolder.set(dbType);
}
public static String getDbType() {
return (String) contextHolder.get();
}
public static void clearDbType() {
contextHolder.remove();
}
}
3.dataSource的配置
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"
default-autowire="byName"> <bean id="aTestDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${a.jdbc.driverClassName}" />
<property name="url" value="${a.jdbc.url}" />
<property name="username" value="${a.jdbc.username}" />
<property name="password" value="${a.jdbc.password}" />
</bean> <bean id="bTestDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${b.jdbc.driverClassName}" />
<property name="url" value="${gott.jdbc.url}" />
<property name="username" value="${b.jdbc.username}" />
<property name="password" value="${b.jdbc.password}" />
</bean> <bean id="dataSource" class="***.DynamicDataSource">
<property name="targetDataSources">
<map key-type="java.lang.String">
<entry key="aTestDataSource" value-ref="aTestDataSource" />
<entry key="bTestDataSource" value-ref="bTestDataSource" />
</map>
</property>
<property name="aTestDataSource" ref="aTestDataSource" />
</bean>
</beans>
4.当需要切换数据源时，只要调用一行代码就可以了
DbContextHolder.setDbType("aTestDataSource");
当然有兴趣的朋友也可以用aop去自动切换数据源
转自：http://blog.163.com/wang_hj138@126/blog/static/140800106201263151242338/
参考:SSH配置多个数据源---http://zhoujingxian.iteye.com/blog/883642
Spring3.3 整合 Hibernate3、MyBatis3.2 配置多数据源/动态切换数据源 方法
http://www.cnblogs.com/hoojo/p/Spring_Hibernate_MyBatis_MultipleDataSource_switchDataSource.html