springmvc 整合多個數據源

1、首先配置兩個數據庫

<bean id="dataSourceA" 	class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<property name="driverClassName" value="${jdbc.driverClassName}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxActive" value="${jdbc.maxActive}" />
		<property name="maxWait" value="${jdbc.maxWait}" />
	</bean>

<bean id="dataSourceB" 	class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="${vjdbc.driverClassName}" />
		<property name="url" value="${vjdbc.url}" />
		<property name="username" value="${vjdbc.username}" />
		<property name="password" value="${vjdbc.password}" />
		<property name="maxActive" value="${jdbc.maxActive}" />
		<property name="maxWait" value="${jdbc.maxWait}" />
	</bean>

2、再配置一個dataSource 管理 key 值和value值對應，默認選擇dataSourceA ，其他配置按照正常的spring mvc 配置即可。

<bean id="dataSource" class="com.broadengate.util.DynamicDataSource">
     <!-- 通過key-value的形式來關聯數據源 -->
		<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="dataSourceA" >
		</property>
	</bean>

3、sessionFactory 中使用 dataSource做數據源。

4、新建一個DynamicDataSource類繼承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();
	}
}

5、切換數據源,這一步必須在進入業務層之前切換。

DynamicDataSource.setCustomerType(DynamicDataSource.DATA_SOURCE_A);