双数据源切换

1. jdbc.properties

#============================================================================
# MySQL
#============================================================================
jdbc.mysql.driver=com.mysql.jdbc.Driver
jdbc.mysql.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
jdbc.mysql.username=root
jdbc.mysql.password=123

#============================================================================
# MS SQL Server (JTDS)
#============================================================================
jdbc.sqlserver.driver=net.sourceforge.jtds.jdbc.Driver
jdbc.sqlserver.url=jdbc:jtds:sqlserver://young4j.com
jdbc.sqlserver.username=root
jdbc.sqlserver.password=123

#============================================================================
# 通用配置
#============================================================================
jdbc.initialSize=5
jdbc.minIdle=5
jdbc.maxIdle=20
jdbc.maxActive=100
jdbc.maxWait=100000
jdbc.defaultAutoCommit=false
jdbc.removeAbandoned=true
jdbc.removeAbandonedTimeout=600
jdbc.testWhileIdle=true
jdbc.timeBetweenEvictionRunsMillis=60000
jdbc.numTestsPerEvictionRun=20
jdbc.minEvictableIdleTimeMillis=300000

2. applicationContext.xml

<bean id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>
    <bean id="sqlServerDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${jdbc.sqlserver.driver}" />
        <property name="url" value="${jdbc.sqlserver.url}" />
        <property name="username" value="${jdbc.sqlserver.username}" />
        <property name="password" value="${jdbc.sqlserver.password}" />
        <property name="initialSize" value="${jdbc.initialSize}" />
        <property name="minIdle" value="${jdbc.minIdle}" />
        <property name="maxIdle" value="${jdbc.maxIdle}" />
        <property name="maxActive" value="${jdbc.maxActive}" />
        <property name="maxWait" value="${jdbc.maxWait}" />
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}" />
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}" />
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}" />
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}" />
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}" />
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}" />
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" />
    </bean>
    <bean id="mySqlDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="${jdbc.mysql.driver}" />
        <property name="url" value="${jdbc.mysql.url}" />
        <property name="username" value="${jdbc.mysql.username}" />
        <property name="password" value="${jdbc.mysql.password}" />
        <property name="initialSize" value="${jdbc.initialSize}" />
        <property name="minIdle" value="${jdbc.minIdle}" />
        <property name="maxIdle" value="${jdbc.maxIdle}" />
        <property name="maxActive" value="${jdbc.maxActive}" />
        <property name="maxWait" value="${jdbc.maxWait}" />
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}" />
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}" />
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}" />
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}" />
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}" />
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}" />
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" />
    </bean>
    <bean id="multipleDataSource" class="com.young4j.MultipleDataSource">
        <property name="defaultTargetDataSource" ref="mySqlDataSource" />
        <property name="targetDataSources">
            <map>
                <entry key="mySqlDataSource" value-ref="mySqlDataSource" />
                <entry key="sqlServerDataSource" value-ref="sqlServerDataSource" />
            </map>
        </property>
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="multipleDataSource" />
    </bean>

    <!-- mybatis.spring自动映射 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.young4j" />
    </bean>

    <!-- 自动扫描，多个包以 逗号分隔 -->
    <context:component-scan base-package="com.young4j" />
    <aop:aspectj-autoproxy />

3.MultipleDataSource.java

public class MultipleDataSource extends AbstractRoutingDataSource {

    private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>();

    public static void setDataSourceKey(String dataSource) {
        dataSourceKey.set(dataSource);
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return dataSourceKey.get();
    }

}

4.test.java

MultipleDataSource.setDataSourceKey("sqlServerDataSource");
List<Map<String, Object>> list2 = sqlServerMapper.getList();