atomikos DataSource

用atomikos做jta事务，以前用SimpleDataSourceBean，总觉得效率比较低

除了SimpleDataSourceBean其实还可以用AtomikosDataSourceBean

这个datasource的连接池方面做得比较好

<bean id="userDataSource" class="com.atomikos.jdbc.AtomikosDataSourceBean"
		init-method="init" destroy-method="close"  lazy-init="true">
		<property name="uniqueResourceName" value="mysql_user" />
		<property name="xaDataSourceClassName"
			value="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" />
		<property name="xaProperties">
			<props>    
                <prop key="URL">${jdbc.user.url}</prop>    
               	<prop key="user">${jdbc.user.username}</prop>    
                <prop key="password">${jdbc.user.password}</prop>    
           </props>
		</property>
		<property name="poolSize"><value>1</value></property>      
        <property name="maxPoolSize"><value>30</value></property>
	</bean>