动态数据源

1.动态数据源工具类

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

/**
 * 动态数据源
 * @author FengMy
 * 
 * @since 2012-11-13
 */
public class RoutingDataSource  extends AbstractRoutingDataSource {
	protected Object determineCurrentLookupKey() {
		return DataSourceHolder.getDataSource();
	}
}

/**
 * 
 * 数据源存放类
 * @author FengMy
 * 
 * @since 2012-11-13
 */
public class DataSourceHolder {
	private static final ThreadLocal<Map<String, Object>> currentDataSource = new ThreadLocal<Map<String, Object>>();
	private static final String DATA_SOURCE = "DATA_SOURCE";
	public static void setDataSource(String dataSource) {
		if(!StringUtils.isEmpty(dataSource)){
			Map<String, Object> holder = currentDataSource.get();
			if(holder == null) {
				holder = new HashMap<String, Object>();
				currentDataSource.set(holder);
			}
			holder.put(DATA_SOURCE, dataSource);
		}
	}

	public static String getDataSource() {
		Map<String, Object> holder = currentDataSource.get();
		if(holder == null) return null;
		return (String) holder.get(DATA_SOURCE);
	}

	public static void clear() {
		currentDataSource.remove();
	}
}

2.数据连接配置applicationContext.xml

<bean id="dataSource" class="com.cstp.common.database.RoutingDataSource">
				<property name="targetDataSources">
					<map key-type="java.lang.String">
							<entry value-ref="dataSource01" key="dataSource01"></entry>
							<entry value-ref="dataSource02" key="dataSource02"></entry>
					</map>
				</property>
				<property name="defaultTargetDataSource" ref="dataSource01"/> 
			</bean>  
			
			
			<bean id="dataSource01" class="com.mchange.v2.c3p0.ComboPooledDataSource"
				destroy-method="close" dependency-check="none">
				<property name="driverClass" value="com.mysql.jdbc.Driver" />
				<property name="jdbcUrl"
					value="jdbc:mysql://...:3306/test01?useUnicode=true&amp;characterEncoding=UTF-8" />
				<property name="user" value="root" />
				<property name="password" value="cmpc" />
				<property name="minPoolSize" value="1" />
				<property name="maxPoolSize" value="20" />
				<property name="maxIdleTime" value="25000" />
				<property name="acquireIncrement" value="1" />
				<property name="acquireRetryDelay" value="1000" />
				<property name="acquireRetryAttempts" value="30" />
				<property name="initialPoolSize" value="3" />
				<property name="idleConnectionTestPeriod" value="1800" />
				<property name="testConnectionOnCheckin" value="true" />
			</bean>
			
			
			<bean id="dataSource02" class="com.mchange.v2.c3p0.ComboPooledDataSource"
				destroy-method="close" dependency-check="none">
				<property name="driverClass" value="com.mysql.jdbc.Driver" />
				<property name="jdbcUrl"
					value="jdbc:mysql://.....:3306/test02?useUnicode=true&amp;characterEncoding=UTF-8" />
				<property name="user" value="root" />
				<property name="password" value="cmpc" />
				<property name="minPoolSize" value="1" />
				<property name="maxPoolSize" value="20" />
				<property name="maxIdleTime" value="25000" />
				<property name="acquireIncrement" value="1" />
				<property name="acquireRetryDelay" value="1000" />
				<property name="acquireRetryAttempts" value="30" />
				<property name="initialPoolSize" value="3" />
				<property name="idleConnectionTestPeriod" value="1800" />
				<property name="testConnectionOnCheckin" value="true" />
			</bean>
			
			
			<bean id="client" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
				<property name="dataSource">
					<ref bean="dataSource"/>
				</property>
				
				<property name="configLocation">
					<value>classpath:SqlMapConfig.xml</value>
				</property>
			</bean>

3.操作时，调用

DataSourceHolder.setDataSource("dataSource01");