Spring 配置多个数据源,并实现动态切换
来源:互联网 发布:网络语画风的意思 编辑:程序博客网 时间:2024/05/16 12:26
来源:http://blog.csdn.net/gaofuqi/article/details/46417281
1.配置两个不同的数据源,如下(由于项目使用的是druid数据库连接,配置可以会复杂点比较):
-
- <bean id="testDataSource1" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
- <property name="driverClassName" value="${db.driver}" />
- <property name="url" value="${unity.db.jdbc.url}" />
- <property name="username" value="${db.login.name}"></property>
- <property name="password" value="${db.login.password}" />
- <property name="filters" value="${db.filters}"></property>
- <property name="maxActive" value="${db.pool.maxActive}"></property>
- <property name="initialSize" value="${db.pool.initialSize}"></property>
- <property name="minIdle" value="${db.pool.minIdle}"></property>
- <property name="maxWait" value="${db.maxWait}"></property>
- <property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"></property>
- <property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"></property>
- <property name="validationQuery" value="${db.validationQuery}"></property>
- <property name="testWhileIdle" value="${db.testWhileIdle}"></property>
- <property name="testOnBorrow" value="${db.testOnBorrow}"></property>
- <property name="testOnReturn" value="${db.testOnReturn}"></property>
- <property name="poolPreparedStatements" value="${db.poolPreparedStatements}"></property>
- <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"></property>
-
- <property name="proxyFilters">
- <list>
- <ref bean="log-filter" />
- </list>
- </property>
-
- </bean>
-
- <bean id="testDataSource2" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
- <property name="driverClassName" value="${db.driver}" />
- <property name="url" value="${pub.db.jdbc.url}" />
- <property name="username" value="${db.login.name}"></property>
- <property name="password" value="${db.login.password}" />
- <property name="filters" value="${db.filters}"></property>
- <property name="maxActive" value="${db.pool.maxActive}"></property>
- <property name="initialSize" value="${db.pool.initialSize}"></property>
- <property name="minIdle" value="${db.pool.minIdle}"></property>
- <property name="maxWait" value="${db.maxWait}"></property>
- <property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"></property>
- <property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"></property>
- <property name="validationQuery" value="${db.validationQuery}"></property>
- <property name="testWhileIdle" value="${db.testWhileIdle}"></property>
- <property name="testOnBorrow" value="${db.testOnBorrow}"></property>
- <property name="testOnReturn" value="${db.testOnReturn}"></property>
- <property name="poolPreparedStatements" value="${db.poolPreparedStatements}"></property>
- <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"></property>
-
- <property name="proxyFilters">
- <list>
- <ref bean="log-filter" />
- </list>
- </property>
-
- </bean>
2.定义一个类继承AbstractRoutingDataSource实现determineCurrentLookupKey方法,该方法可以实现数据库的动态切换,如下:- public class DynamicDataSource extends AbstractRoutingDataSource {
- @Override
- protected Object determineCurrentLookupKey() {
- return DataSourceContextHolder.getDataSourceType();
- }
- }
3.定义一个可以设置当前线程的变量的工具类,用于设置对应的数据源名称:- public class DataSourceContextHolder {
- private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
-
-
-
-
-
-
- public static void setDataSourceType(String dataSourceType) {
- contextHolder.set(dataSourceType);
- }
-
-
-
-
-
-
-
- public static String getDataSourceType() {
- return contextHolder.get();
- }
-
-
-
-
-
-
-
- public static void clearDataSourceType() {
- contextHolder.remove();
- }
- }
然后在spring中配置,如下:
-
- <bean class="com.sino.access.database.DynamicDataSource" id="dataSource">
- <property name="targetDataSources">
- <map key-type="java.lang.String">
- <entry value-ref="testDataSource1" key="<span style="font-family: Arial, Helvetica, sans-serif;">testDataSource1</span><span style="font-family: Arial, Helvetica, sans-serif;">"></entry></span>
- <entry value-ref="testDataSource2" key="testDataSource2"></entry>
- </map>
- </property>
- <property name="defaultTargetDataSource" ref="testDataSource1">
- </property>
- </bean>
</bean>这样配置两个数据源对应的key分别为testDataSource1和testDataSource2,默认数据库是testDataSource。4.完成以上步骤后,如果没有数据库的事务管理,已经可以实现数据库的动态切换了。但是如果涉及到数据库的事务管理,需要在数据库事务开启切换数据库,否则数据库的切换只能在下次数据库操作时才生效。可以定义一个aop处理类在数据库事务开启之前切换数据库,如下:
- public class DataSourceAspect implements MethodBeforeAdvice,AfterReturningAdvice
- {
-
- @Override
- public void afterReturning(Object returnValue, Method method,
- Object[] args, Object target) throws Throwable {
-
- DataSourceContextHolder.clearDataSourceType();
- }
-
- @Override
- public void before(Method method, Object[] args, Object target)
- throws Throwable {
-
- if (method.isAnnotationPresent(DataSource.class))
- {
- DataSource datasource = method.getAnnotation(DataSource.class);
- DataSourceContextHolder.setDataSourceType(datasource.name());
- }
- else
- {
- DataSourceContextHolder.setDataSourceType(SinoConstant.DataSourceType.unityDataSource.toString());
- }
-
- }
- }
5.设置数据库事务切面和切换数据库切面执行的顺序,如下:- <aop:config>
- <aop:pointcut id="transactionPointCut" expression="execution(* com.test.service.*.*(..))" />
- <aop:advisor pointcut-ref="transactionPointCut"
- advice-ref="txAdvice" order="2" />
- <aop:advisor advice-ref="dataSourceExchange" pointcut-ref="transactionPointCut" order="1"/>
- </aop:config>
利用aop的order属性设置执行的顺序,这样实现了带事务管理的spring数据库动态切换。
由于之前博客少了部分代码,自己重新写了一个demo:
链接: https://pan.baidu.com/s/1c1FurkO 密码: qiec