spring 动态数据源切换

<!-- 分散配置 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 配置(主库)数据源 -->
	<bean id="dataSource-main" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${jdbc.driverclass}" />
		<property name="jdbcUrl" value="${jdbc.url}" />
		<property name="user" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		
		<property name="maxPoolSize" value="${c3p0.pool.size.max}" />
		<property name="minPoolSize" value="${c3p0.pool.size.min}" />
		<property name="initialPoolSize" value="${c3p0.pool.size.ini}" />
		<property name="acquireIncrement" value="${c3p0.pool.size.increment}" />
	</bean>
	
	<!-- 配置从库数据源 -->
	<bean id="dataSource-1" parent="dataSource-main">
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/lsn_surveypark001_1" />
	</bean>
	
	<!-- 数据源路由器 -->
	<bean id="dataSourceRouter" class="com.surveypark.datasource.SurveyparkDataSourceRouter">
		<!-- 目标数据源集合 -->
		<property name="targetDataSources">
			<map>
				<entry key="odd" value-ref="dataSource-main" />
				<entry key="even" value-ref="dataSource-1" />
			</map>
		</property>
		<!-- 默认数据源集合 -->
		<property name="defaultTargetDataSource" ref="dataSource-main" />
	</bean>      

public class SurveyparkDataSourceRouter extends AbstractRoutingDataSource {
 
	protected Object determineCurrentLookupKey() { 
		SurveyparkToken token = SurveyparkToken.getCurrentToken();
		if(token != null){
			Integer id = token.getSurvey().getId(); 
			SurveyparkToken.unbindToken();
			return ((id % 2) == 0) ? "even" : "odd" ;
		}
		return null;
	}
}
      

public class SurveyparkToken { 
	private static 	ThreadLocal<SurveyparkToken> l = new ThreadLocal<SurveyparkToken>();
	
	private Survey survey ;

	public Survey getSurvey() {
		return survey;
	}

	public void setSurvey(Survey survey) {
		this.survey = survey;
	}
	
	 
	public static void bindToken(SurveyparkToken token){
		l.set(token);
	}
	 
	public static void unbindToken(){
		l.remove();
	}
 
	public static SurveyparkToken getCurrentToken(){
		return l.get();
	}
}
      

SurveyparkToken token = new SurveyparkToken();
token.setSurvey(getCurrentSurvey());
SurveyparkToken.bindToken(token);
surveyService.saveAnswers(processAnswers());      

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