Spring MVC+MyBatis框架使用多个数据源以及之间的切换

死siua11

至于怎么搭建Spring MVC+MyBatis框架，我这里就不详细说了，可以参考：http://xieke90.iyunv.com/blog/2241054
一、同时使用多个数据源
   以下实例演示同时使用两个数据源：
   <1>、applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd"
default-init-method="init">   
<!-- 引入jdbc配置文件 -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--创建jdbc数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</bean>
<bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url2}" />
<property name="username" value="${username2}" />
<property name="password" value="${password2}" />
</bean>
<!-- 创建SqlSessionFactory，同时指定数据源 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 配置sql映射文件所在位置  注意：默认与mapper类位置相同   -->
<property name="mapperLocations" value="classpath:sqlmap/car/*.xml" />
</bean>
<bean id="sqlSessionFactory2" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource2" />
<property name="mapperLocations" value="classpath:sqlmap/order/*.xml" />
</bean>
<!-- Mapper接口所在包名，Spring会自动查找其下的Mapper -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.xieke.test.mapper.car" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<!-- 默认情况下会自动注入id=sqlSessionFactory的bean，也可以按上述方式指定sqlSessionFactory -->
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.xieke.test.mapper.order" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory2" />
</bean>
</beans>
   <2>、jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test
username=root
password=999999
url2=jdbc:mysql://localhost:3306/test2
username2=root
password2=999999
   <3>、以上是主要的配置，其它配置跟配置Spring MVC是一样的，详细情况请阅读下面的源代码。
 
二、数据源之间的切换
   以下演示两个数据源之间的切换：
   <1>、applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd"
default-init-method="init">   
<!-- 引入jdbc配置文件 -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!--创建jdbc数据源 -->
<bean id="dataSourceA" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${a.url}" />
<property name="username" value="${a.username}" />
<property name="password" value="${a.password}" />
</bean>
<bean id="dataSourceB" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${b.url}" />
<property name="username" value="${b.username}" />
<property name="password" value="${b.password}" />
</bean>
<!-- 配置dataSource管理key和value的对应，默认选择dataSourceB -->
<bean id="dataSource" class="com.xieke.test.util.DynamicDataSource">
<!-- 通过key-value的形式来关联数据源 -->
<property name="targetDataSources">
<map key-type="java.lang.String">
<entry value-ref="dataSourceA" key="dataSourceA"></entry>
<entry value-ref="dataSourceB" key="dataSourceB"></entry>
</map>
</property>
<property name="defaultTargetDataSource" ref="dataSourceB" >
</property>
</bean>
<!-- 创建SqlSessionFactory，同时指定数据源 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 配置sql映射文件所在位置  注意：默认与mapper类位置相同   -->
<property name="mapperLocations" value="classpath:sqlmap/**/*.xml" />
</bean>
<!-- Mapper接口所在包名，Spring会自动查找其下的Mapper -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.xieke.test.mapper" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
<!-- 默认情况下会自动注入id=sqlSessionFactory的bean，也可以按上述方式指定sqlSessionFactory -->
</bean>
</beans>
   <2>、jdbc.properties

driver=com.mysql.jdbc.Driver
a.url=jdbc:mysql://localhost:3306/test
a.username=root
a.password=999999
b.url=jdbc:mysql://localhost:3306/test2
b.username=root
b.password=999999
   <3>、数据源管理类：DynamicDataSource，需要继承AbstractRoutingDataSource。

package com.xieke.test.util;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource
{
public static final String DATA_SOURCE_A = "dataSourceA";
public static final String DATA_SOURCE_B = "dataSourceB";
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();
}
@Override
protected Object determineCurrentLookupKey()
{
return getCustomerType();
}
@Override
public Logger getParentLogger() throws SQLFeatureNotSupportedException
{
return null;
}
}
   <4>、切换数据源时调用setCustomerType方法，比如我要使用dataSourceA，切换代码就是“DynamicDataSource.setCustomerType(DynamicDataSource.DATA_SOURCE_A);”。
   <5>、以上是主要的配置，其它配置跟配置Spring MVC是一样的，详细情况请阅读下面的源代码。
 
三、源代码下载地址
  <1>、同时使用两个数据源实例的源代码下载地址：http://pan.baidu.com/s/1o66a3kI
  <2>、两个数据源之间的切换实例的源代码下载地址：http://pan.baidu.com/s/1sjxgPSp
 
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