宣告:本片文章來源於開源社群論壇轉載~！奮鬥

使用NonXADataSourceBean. Mysql在5.0版本和Connecter/J5.0版本後提供了XADatasource支援，如果使用了支援XADatasouce版本

最近做的project中遇到要將資料庫中的表分佈到兩臺不同的伺服器上的Mysql5.0中，project主要使用spring+ibatis。因此需要JTA的支援，但是tomcat不支援，所以就搜尋開源的JTA實現。
最開始使用的是JOTM，但是使用中不能自動rollback，無論什麼情況都commit。然後看到infoq上一篇文章提到Atomikos Transactions Essentials，Atomikos Transactions Essentials 3.0是Atomikos 開發的核心事務引擎，支援JDBC 以及JMS 的JTA/XA 事務。易於部署，輕量級，同時支援JDBC 以及JMS 。
Atomikos Transactions Essentials現在的版本是3.1.7,可以在

<!-- 第一個資料庫 -->
 
  
< bean id = "dataSource" class = "com.atomikos.jdbc.SimpleDataSourceBean"   init-method = "init" destroy-method = "close" >   
    <property name="uniqueResourceName">   
        <value> mysql/main </value>   
    </property>   
    <property name = "xaDataSourceClassName
 
">   
        <!-- 使用Mysql XADataSource(mysql>=5.0, Connector/J>=5.0才可以支援XADatasource)-->  
        <value > com.mysql.jdbc.jdbc2.optional.MysqlXADataSource </ value >   
    </ property >   
    < property   name = "xaDataSourceProperties" >   
        < value > URL =${jdbc.url}; user =${jdbc.username}; password =${jdbc.password} </ value >   
    </ property >   
    < property   name = "exclusiveConnectionMode" >   
        < value > true </ value >   
    </ property >   
    < property   name = "connectionPoolSize" >   
        < value > 3 </ value >   
    </ property >   
    < property   name = "validatingQuery" >   
        < value > SELECT 1 </ value >   
    </ property >   
</ bean >   
<!-- 第二個資料庫 -->  
< bean   id = "dataSourceB"   class = "com.atomikos.jdbc.SimpleDataSourceBean"   init-method = "init"   destroy-method = "close" >   
    < property   name = "uniqueResourceName" >   
        < value > mysql/news </ value >   
    </ property >   
    < property   name = "xaDataSourceClassName" >   
        <!-- 使用Mysql XADataSource(mysql>=5.0, Connector/J>=5.0才可以支援XADatasource)-->  
        < value > com.mysql.jdbc.jdbc2.optional.MysqlXADataSource </ value >   
    </ property >   
    < property   name = "xaDataSourceProperties" >   
        < value > URL =${jdbc.url.b}; user =${jdbc.username.b}; password =${jdbc.password.b} </ value >   
    </ property >   
    < property   name = "exclusiveConnectionMode" >   
        < value > true </ value >   
    </ property >   
    < property   name = "connectionPoolSize" >   
        < value > 3 </ value >   
    </ property >   
    < property   name = "validatingQuery" >   
        < value > SELECT 1 </ value >   
    </ property >   
</ bean >   


< bean   id = "lobHandler"   class = "org.springframework.jdbc.support.lob.DefaultLobHandler"   />   

<!-- 第一個資料庫的sqlMapClient -->  
< bean   id = "sqlMapClient"   class = "org.springframework.orm.ibatis.SqlMapClientFactoryBean" >   
    < property   name = "configLocation" >   
        <!-- 包含第一個資料庫表的map -->  
        < value > classpath:/sqlmap-config.xml </ value >   
    </ property >   
    < property   name = "dataSource"   ref = "dataSource"   />   
    < property   name = "lobHandler"   ref = "lobHandler"   />   
</ bean >   
<!-- 第二個資料庫的sqlMapClient -->  
< bean   id = "sqlMapClientB"   class = "org.springframework.orm.ibatis.SqlMapClientFactoryBean" >   
    < property   name = "configLocation" >   
        <!-- 包含第一個資料庫表的map -->  
        < value > classpath:/sqlmap-configb.xml </ value >   
    </ property >   
    < property   name = "dataSource"   ref = "dataSourceB"   />   
    < property   name = "lobHandler"   ref = "lobHandler"   />   
</ bean >   

<!-- Construct Atomikos UserTransactionManager, needed to configure Spring -->  
< bean   id = "atomikosTransactionManager"   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 = "atomikosUserTransaction"   class = "com.atomikos.icatch.jta.UserTransactionImp" >   
    < property   name = "transactionTimeout"   value = "240"   />   
</ 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 = "atomikosTransactionManager"   />   
    </ property >   
    < property   name = "userTransaction" >   
        < ref   bean = "atomikosUserTransaction"   />   
    </ property >   
</ bean >

事務的配置, 使用了spring2.0的語法，所以將namesapce也帖出來了.

<? 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:tx = "http://www.springframework.org/schema/tx"  
       xsi:schemaLocation ="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd  
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd  
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"  
       default-autowire = "byName"   default-lazy-init = "true" >   
    <!-- 支援 @AspectJ 標記-->  
    < aop:aspectj-autoproxy />   

    < aop:config   proxy-target-class = "true" >   
        < aop:advisor   pointcut = "execution(* *Facade.*(..))"   advice-ref = "txAdvice" />   
        < aop:advisor   pointcut = "execution(* *Manager.*(..))"   advice-ref = "txAdvice" />   
    </ aop:config >   

    < tx:advice   id = "txAdvice" >   
        < tx:attributes >   
            < tx:method   name = "get*"   read-only = "true" />   
            < tx:method   name = "find*"   read-only = "true" />   
            < tx:method   name = "has*"   read-only = "true" />   
            < tx:method   name = "locate*"   read-only = "true" />   
            < tx:method   name = "*" />   
        </ tx:attributes >   
    </ tx:advice >   
</ beans >

這樣配置以後就可以使用分散式事務，測試中出現異常時事務也自動回滾。和JOTM相比Atomikos Transactions Essentials更加穩定，它原來是商業專案，現在開源了。象mysql一樣賣服務支援的。而且論壇頁比較活躍，有問題很快可以解決。