spring基于通用Dao的多数据源配置详解

spring基于通用Dao的多数据源配置详解

有时候在一个项目中会连接多个数据库,需要在spring中配置多个数据源,最近就遇到了这个问题,由于我的项目之前是基于通用Dao的，配置的时候问题不断，这种方式和资源文件冲突；扫描映射文件的话，SqlSessionFactory的bean名字必须是sqlSessionFactory 他读不到sqlSessioNFactory2或者其他名字,最终解决方法如下：

1.在项目中加入如下类MultipleDataSource.java

package com.etoak.util;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class MultipleDataSource extends AbstractRoutingDataSource {

private static final ThreadLocal dataSourceKey = new InheritableThreadLocal();

public static void setDataSourceKey(String dataSource) {

dataSourceKey.set(dataSource);

}

@Override

protected Object determineCurrentLookupKey() {

// TODO Auto-generated method stub

return dataSourceKey.get();

}

}

spring配置文件如下：

xmlns:context=xqmfVvYE"http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xmlns:mvc="http://springframework.org/schema/mvc"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.2.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.2.xsd

http://springframework.org/schema/mvc

http://springframework.org/schema/mvc/spring-mvc-3.2.xsd">

p:driverClassName="${mysql.driver}"

p:url="${mysql.url}"

p:username="${mysql.username}"

p:password="${mysql.password}"/>

p:driverClassName="${mysql2.driver}"

p:url="${mysql2.url}xqmfVvYE"

p:username="${mysql2.username}"

p:password="${mysql2.password}"/>

p:dataSource-ref="multipleDataSource"

p:mapperLocations="classpath:com/etoak/dao/*-mapper.xmlxqmfVvYE"/>

xmlns:context=xqmfVvYE"http://springframework.org/schema/context"

xmlns:p="http://springframework.org/schema/p"

xmlns:mvc="http://springframework.org/schema/mvc"

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.2.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.2.xsd

http://springframework.org/schema/mvc

http://springframework.org/schema/mvc/spring-mvc-3.2.xsd">

p:driverClassName="${mysql.driver}"

p:url="${mysql.url}"

p:username="${mysql.username}"

p:password="${mysql.password}"/>

p:driverClassName="${mysql2.driver}"

p:url="${mysql2.url}xqmfVvYE"

p:username="${mysql2.username}"

p:password="${mysql2.password}"/>

p:dataSource-ref="multipleDataSource"

p:mapperLocations="classpath:com/etoak/dao/*-mapper.xmlxqmfVvYE"/>

p:driverClassName="${mysql.driver}"

p:url="${mysql.url}"

p:username="${mysql.username}"

p:password="${mysql.password}"/>

p:driverClassName="${mysql2.driver}"

p:url="${mysql2.url}xqmfVvYE"

p:username="${mysql2.username}"

p:password="${mysql2.password}"/>

p:driverClassName="${mysql2.driver}"

p:url="${mysql2.url}xqmfVvYE"

p:username="${mysql2.username}"

p:password="${mysql2.password}"/>

p:dataSource-ref="multipleDataSource"

p:mapperLocations="classpath:com/etoak/dao/*-mapper.xmlxqmfVvYE"/>

p:dataSource-ref="multipleDataSource"

p:mapperLocations="classpath:com/etoak/dao/*-mapper.xmlxqmfVvYE"/>

测试类如下：

package com.etoak.test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

import com.etoak.dao.ProductDaoIf;

import com.etoak.util.MultipleDataSource;

public class Test {

public static void main(String[] args) {

ApplicationContext ac = new

FileSystemXmlApplicationContext("WebContent/WEB-INF/etoak-servlet.xml");

ProductDaoIf proDao = (xqmfVvYEProductDaoIf)ac.getBean(ProductDaoIf.class);

MultipleDataSource.setDataSourceKey("ds1");

xqmfVvYEint count1 = proDao.selectProductCount();

MultipleDataSource.setDataSourceKey("ds2");

int count2 = proDao.selectProductCount();

System.out.println(count1);

System.out.println(count2);

}

}

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