利用Spring的AbstractRoutingDataSource解决多数据源的问题

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*，涉及到多数据源的问题。

解决方法如下：

1、首先配置多个datasource

 1 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 2      <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver"> 3   </property> 4   <property name="url" value="jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards"> 5   </property> 6   <property name="username" value="youguess"></property> 7   <property name="password" value="youguess"></property> 8  </bean> 9  <bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource">10      <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver">11   </property>12   <property name="url" value="jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards">13   </property>14   <property name="username" value="youguess"></property>15   <property name="password" value="youguess"></property>16 </bean>

2、写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法

 

1 package com.standard.core.util;2 import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;3 public class DynamicDataSource extends AbstractRoutingDataSource {4     @Override5     protected Object determineCurrentLookupKey() {6         return CustomerContextHolder.getCustomerType();7     }8 }

 

3、利用ThreadLocal解决线程安全问题

 

 1 package com.standard.core.util; 2 public class CustomerContextHolder { 3     public static final String DATA_SOURCE_A = "dataSource"; 4     public static final String DATA_SOURCE_B = "dataSource2"; 5     private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 6     public static void setCustomerType(String customerType) { 7         contextHolder.set(customerType); 8     } 9     public static String getCustomerType() {10         return contextHolder.get();11     }12     public static void clearCustomerType() {13         contextHolder.remove();14     }15 }

4、数据源配置

 1 <bean id="dynamicDataSource" class="com.standard.core.util.DynamicDataSource" > 2         <property name="targetDataSources"> 3             <map key-type="java.lang.String"> 4                 <entry value-ref="dataSource" key="dataSource"></entry> 5                 <entry value-ref="dataSource2" key="dataSource2"></entry> 6             </map> 7         </property> 8         <property name="defaultTargetDataSource" ref="dataSource" > 9         </property>10     </bean>

5、在DAOImpl中切换数据源

1 CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);

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