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
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< bean id = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource" > < property name = "driverClassName" value = "net.sourceforge.jtds.jdbc.Driver" > </ property > < property name = "url" value = "jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards" > </ property > < property name = "username" value = "youguess" ></ property > < property name = "password" value = "youguess" ></ property > </ bean > < bean id = "dataSource2" class = "org.apache.commons.dbcp.BasicDataSource" > < property name = "driverClassName" value = "net.sourceforge.jtds.jdbc.Driver" > </ property > < property name = "url" value = "jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards" > </ property > < property name = "username" value = "youguess" ></ property > < property name = "password" value = "youguess" ></ property > </ bean > |
2、写一个DynamicDataSource类继承AbstractRoutingDataSource,并实现determineCurrentLookupKey方法
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package com.standard.core.util; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class DynamicDataSource extends AbstractRoutingDataSource { @Override protected Object determineCurrentLookupKey() { return CustomerContextHolder.getCustomerType(); } } |
3、利用ThreadLocal解决线程安全问题
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package com.standard.core.util; public class CustomerContextHolder { public static final String DATA_SOURCE_A = "dataSource" ; public static final String DATA_SOURCE_B = "dataSource2" ; private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); public static void setCustomerType(String customerType) { contextHolder.set(customerType); } public static String getCustomerType() { return contextHolder.get(); } public static void clearCustomerType() { contextHolder.remove(); } } |
4、数据源配置
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< bean id = "dynamicDataSource" class = "com.standard.core.util.DynamicDataSource" > < property name = "targetDataSources" > < map key-type = "java.lang.String" > < entry value-ref = "dataSource" key = "dataSource" ></ entry > < entry value-ref = "dataSource2" key = "dataSource2" ></ entry > </ map > </ property > < property name = "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服务器之家。
原文链接:http://blog.csdn.net/alaahong/article/details/8707915