springMVC配置Mybatis多數據源

jdbc.properties

#mid數據源
mid.database.connecturl=jdbc:mysql://IP:3306/DB1?serverTimezone=Hongkong&useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
mid.database.username=expertuser
mid.database.password=123456

#oa數據源
oa.database.connecturl=jdbc:mysql://IP:3306/DB2?serverTimezone=Hongkong&useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
oa.database.username=root
oa.database.password=root123

ApplicationContext.xml

<!-- JDBC數據源 -->
	<bean id="OPDataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="maxActive" value="15" />
		<property name="maxIdle" value="0" />
		<property name="minIdle" value="0" />
		<property name="maxWait" value="30000" />
		<property name="validationQuery" value="SELECT 1" />
		<property name="minEvictableIdleTimeMillis" value="300000" />
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="${mid.database.connecturl}" />
		<property name="username" value="${mid.database.username}" />
		<property name="password" value="${mid.database.password}" />
	</bean>

	<bean id="OADataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="maxActive" value="15" />
		<property name="maxIdle" value="0" />
		<property name="minIdle" value="0" />
		<property name="maxWait" value="30000" />
		<property name="validationQuery" value="SELECT 1" />
		<property name="minEvictableIdleTimeMillis" value="300000" />
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="${oa.database.connecturl}" />
		<property name="username" value="${oa.database.username}" />
		<property name="password" value="${oa.database.password}" />
	</bean>
	
	<bean id="dataSource" class="com.meritco.xsystem.expert.db.DynamicDataSource">
		<property name="targetDataSources">
			<map>
				<entry key="OPDataSource" value-ref="OPDataSource"></entry>	
				<entry key="OADataSource" value-ref="OADataSource"></entry>	
			</map>
		</property>
		<property name="defaultTargetDataSource" ref="OPDataSource"></property>
	</bean>
	
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
			<property name="dataSource" ref="dataSource" />
	</bean>

	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage"
			value="com.meritco.xsystem.*.*.dao" />
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
	</bean>
	
	<!-- 事務管理對象    -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 使用annotation聲明式事務    -->
    <tx:annotation-driven transaction-manager="transactionManager" />
	
	<!-- 使用annotation定義DAO和Service  -->
	<ctx:component-scan base-package="com.meritco.xsystem" />
	

DynamicDataSource

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

public class DynamicDataSource extends AbstractRoutingDataSource{

	@Override
	protected Object determineCurrentLookupKey() {
		// TODO Auto-generated method stub
		return DynamicDataSourceHolder.getDataSourceType();
	}
}

DynamicDataSourceHolder

public class DynamicDataSourceHolder {
	private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();

	public static void setDataSourceType(String dataSourceType) {
		contextHolder.set(dataSourceType);
	}

	public static String getDataSourceType() {
		return contextHolder.get();
	}

	public static void clearDataSourceType() {
		contextHolder.remove();
	}
}

在Controller可以自由切換數據源

DynamicDataSourceHolder.setDataSourceType("OADataSource");