详解利用Spring的AbstractRoutingDataSource解决多数据源的问题
多数据源问题很常见，例如读写分离数据库配置。
原来的项目出现了新需求，局方要求新增某服务器用以提供某代码，涉及到多数据源的问题。
研究成果如下：
1、首先配置多个datasource
<beanid="dataSource"class="org.apache.commons.dbcp.BasicDataSource"> <propertyname="driverClassName"value="net.sourceforge.jtds.jdbc.Driver"> </property> <propertyname="url"value="jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards"> </property> <propertyname="username"value="youguess"></property> <propertyname="password"value="youguess"></property> </bean> <beanid="dataSource2"class="org.apache.commons.dbcp.BasicDataSource"> <propertyname="driverClassName"value="net.sourceforge.jtds.jdbc.Driver"> </property> <propertyname="url"value="jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards"> </property> <propertyname="username"value="youguess"></property> <propertyname="password"value="youguess"></property> </bean>
2、写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法
packagecom.standard.core.util;
importorg.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
publicclassDynamicDataSourceextendsAbstractRoutingDataSource{
@Override
protectedObjectdetermineCurrentLookupKey(){
returnCustomerContextHolder.getCustomerType();
}
}
3、利用ThreadLocal解决线程安全问题
packagecom.standard.core.util;
publicclassCustomerContextHolder{
publicstaticfinalStringDATA_SOURCE_A="dataSource";
publicstaticfinalStringDATA_SOURCE_B="dataSource2";
privatestaticfinalThreadLocal<String>contextHolder=newThreadLocal<String>();
publicstaticvoidsetCustomerType(StringcustomerType){
contextHolder.set(customerType);
}
publicstaticStringgetCustomerType(){
returncontextHolder.get();
}
publicstaticvoidclearCustomerType(){
contextHolder.remove();
}
}
4、数据源配置
<beanid="dynamicDataSource"class="com.standard.core.util.DynamicDataSource"> <propertyname="targetDataSources"> <mapkey-type="java.lang.String"> <entryvalue-ref="dataSource"key="dataSource"></entry> <entryvalue-ref="dataSource2"key="dataSource2"></entry> </map> </property> <propertyname="defaultTargetDataSource"ref="dataSource"> </property> </bean>
5、在DAOImpl中切换数据源
CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);
搞定！
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毛票票。