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Spring配置多个数据源并实现动态切换示例

转载 作者:qq735679552 更新时间:2022-09-27 22:32:09 24 4
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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):

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<!-- 数据源配置1 -->
   < 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 >
    <!-- 监控数据库 -->
     < property name = "proxyFilters" >
       < list >
         < ref bean = "log-filter" />
       </ list
     </ property >
    
  </ bean >
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<!-- 数据源配置2 -->
  < 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 >
   <!-- 监控数据库 -->
    < 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:

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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:

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public class DataSourceContextHolder {
   private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
   /**
    * @Description: 设置数据源类型
    * @param dataSourceType 数据库类型
    * @return void
    * @throws
    */
   public static void setDataSourceType(String dataSourceType) {
     contextHolder.set(dataSourceType);
   }
   
   /**
    * @Description: 获取数据源类型
    * @param
    * @return String
    * @throws
    */
   public static String getDataSourceType() {
     return contextHolder.get();
   }
   
   /**
    * @Description: 清除数据源类型
    * @param
    * @return void
    * @throws
    */
   public static void clearDataSourceType() {
     contextHolder.remove();
   }
}

然后在spring中配置,如下:

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<!-- 编写spring 配置文件的配置多数源映射关系 -->
< 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:

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public class DataSourceAspect implements MethodBeforeAdvice,AfterReturningAdvice 
{
 
   @Override
   public void afterReturning(Object returnValue, Method method,
       Object[] args, Object target) throws Throwable {
     // TODO Auto-generated method stub
     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:

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< 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.

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:http://blog.csdn.net/gaofuqi/article/details/46417281 。

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