Spring配置一个事务中多个数据源

（个人观点）

在一个事务中包含多个数据源的更新操作时，需要JTA的支持，通常JTA的支持是由J2EE容器提供的（WAS，Weblogic...），也有单独实现JTA的第3方jar。

Spring提供的是jotm和xapool，但在配置过程中遇到了问题，使用org.enhydra.jdbc.standard.StandardXADataSource做数据源时，它的shutdown方法是带参数的

Xml代码

<bean id="innerMysqlDataSource" class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown">
...
</bean>

xapool的文档做的不好就没有继续，又找了另一个，AtomikosTransactionsEssentials（支持JMS和JDBC作为数据源）。

Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <tx:annotation-driven />
    
    <bean id="DS1" class="com.atomikos.jdbc.AtomikosDataSourceBean"
        init-method="init" destroy-method="close">
        <property name="uniqueResourceName">
            <value>DB1</value>
        </property>
        <property name="xaDataSourceClassName">
            <value>com.ibm.db2.jcc.DB2XADataSource</value>
        </property>
        <property name="xaProperties">
            <props>
                <prop key="serverName">XXX</prop>
                <prop key="portNumber">50000</prop>
                <prop key="databaseName">DB1</prop>
                <prop key="driverType">4</prop>
                <prop key="user">XXX</prop>
                <prop key="password">XXX</prop>
            </props>
        </property>
        <property name="maxIdleTime" value="XXX" />
        <property name="maxPoolSize" value="XXX" />
        <property name="minPoolSize" value="XXX" />
    </bean>

    <bean id="DS2" class="com.atomikos.jdbc.AtomikosDataSourceBean"
        init-method="init" destroy-method="close">
        <property name="uniqueResourceName">
            <value>DB2</value>
        </property>
        <property name="xaDataSourceClassName">
            <value>com.ibm.db2.jcc.DB2XADataSource</value>
        </property>
        <property name="xaProperties">
            <props>
                <prop key="serverName">XXX</prop>
                <prop key="portNumber">50000</prop>
                <prop key="databaseName">DB2</prop>
                <prop key="driverType">4</prop>
                <prop key="user">XXX</prop>
                <prop key="password">XXX</prop>
            </props>
        </property>
         <property name="maxIdleTime" value="XXX" />
        <property name="maxPoolSize" value="XXX" />
        <property name="minPoolSize" value="XXX" />
    </bean>

    <!--
        Construct Atomikos UserTransactionManager, needed to configure
        Spring
    -->
    <bean id="userTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager"
    init-method="init" destroy-method="close">
        <!--
            when close is called, should we force transactions to
            terminate or not?
        -->
        <property name="forceShutdown">
            <value>true</value>
        </property>
    </bean>

    <!--
        Also use Atomikos UserTransactionImp, needed to configure Spring
    -->
    <bean id="userTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
        <property name="transactionTimeout">
            <value>300</value>
        </property>
    </bean>

    <!--
        Configure the Spring framework to use JTA transactions from
        Atomikos
    -->
    <bean id="transactionManager"
        class="org.springframework.transaction.jta.JtaTransactionManager">

        <property name="transactionManager">
            <ref bean="userTransactionManager" />
        </property>
        <property name="userTransaction">
            <ref bean="userTransaction" />
        </property>
    </bean>

</beans>

xaDataSourceClassName是设置javax.sql.XADataSource（使用DB的驱动提供），其中xaProperties是Map类型的，通过反射设置javax.sql.XADataSource的属性。例子中使用的是DB2。