專案框架是ssm的:

spring-mybatis.xml檔案:

mysql的連線配置就直接寫死了,mysql的配置就不多寫了,直接用properties檔案,

<?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:tx="http://www.springframework.org/schema/tx"
       
 
xsi:schemaLocation="http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">

    <bean id="mySqlDataSource" class="com.alibaba.druid.pool.DruidDataSource" 
 
destroy-method="close">
        <property name="username" value="${connection.username}"></property>
        <property name="password" value="${connection.password}"></property>
        <property name="url" value="${connection.url}"></property>
        <property 
 
name="driverClassName" value="${connection.driverClassName}"></property>
        <property name="maxActive" value="${connection.maxActive}"></property>
        <property name="minIdle" value="${connection.minIdle}"></property>
        <property name="filters" value="${connection.filters}"/>
        <property name="initialSize" value="${connection.initialSize}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${connection.timeBetweenEvictionRunsMillis}"/>
        <property name="minEvictableIdleTimeMillis" value="${connection.minEvictableIdleTimeMillis}"/>
        <property name="maxOpenPreparedStatements" value="${connection.maxOpenPreparedStatements}"/>
        <property name="removeAbandoned" value="${connection.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${connection.removeAbandonedTimeout}"/>
        <property name="logAbandoned" value="${connection.logAbandoned}"/>
    </bean>


    <!-- 配置sqlserver資料來源 -->
    <bean id="sqlServerDataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
        <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
        <property name="url" value="jdbc:sqlserver://XXX.168.x.xxx:1433;DatabaseName=資料庫名稱"/>
        <property name="username" value="使用者名稱"/>
        <property name="password" value="密碼"/>
    </bean>


    <!-- aop攔截處理，去掉也能執行對應的 dataSource 改掉-->
    <bean id="dataSource" class="qgs.serviceOperation.util.DbcontextHolder"><!-- 這裡寫選擇資料來源的類地址 下面跟著給出-->
        <property name="defaultTargetDataSource" ref="mySqlDataSource"/><!-- 設定預設為此mySqlDataSource資料來源-->
        <property name="targetDataSources">
            <map>
                <entry key="mySqlDataSource" value-ref="mySqlDataSource"/>
                <entry key="sqlServerDataSource" value-ref="sqlServerDataSource"/>
            </map>
        </property>
    </bean>
    <!-- myBatis檔案 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath*:/mapper/**/*.xml"/>
        <property name="configLocation">
            <value>classpath:spring/mybatis-setting.xml</value>
        </property>
    </bean>
    <!-- mybatis.spring自動對映 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="qgs.serviceOperation.**.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <!-- 配置事務管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 註解方式配置事物 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans> 

建立一個切換資料來源的工具類 DbcontextHolder:

package qgs.serviceOperation.util;

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

public class DbcontextHolder extends AbstractRoutingDataSource {
    public static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();

    /**
     * 設定當前資料來源
     * @param dbType
     */
    public static void setDbType(String dbType){
        contextHolder.set(dbType);
    }
    /**
     * 獲得當前資料來源
     * @return
     */
    public static String getDbType(){
        String dbType = (String)contextHolder.get();
        return dbType;
    }
    /**
     *清除上下文
     *
     */
    public void clearContext(){
        contextHolder.remove();
    }
    @Override
    protected Object determineCurrentLookupKey() {
        return DbcontextHolder.getDbType();
    }
}

接下來就是使用了,我是直接在Service的實現類裡呼叫

首先剛開始是mysql資料庫,然後呼叫這個方法的時候就切換下資料來源,

@Override
public List<ProjectFollowInfo> getProjectFollowInfo(Integer id) {
    //切換資料來源
    DbcontextHolder.setDbType("sqlServerDataSource");
    return customerInfoMapper.getProjectFollowInfo(id);
}