spring +JTA + atomikos 实现分布式事务
***1 同一个web服务器,多个数据库,使用atomikos
2 跨越多个web服务器的事务,如果远程调用支持事务传播,使用JTA,如果不支持事务传播,尽量转化为一个web服务器的情况*
参考的网上一篇文章
配置了2个数据源,在一个service方法中同时向2个数据库中的表分别插入数据。
1、准备数据
create database user;
CREATE TABLE `user` (
`id` int(11) DEFAULT NULL,
`name` varchar(100) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
create database log;
CREATE TABLE `log` (
`id` int(11) DEFAULT NULL,
`content` varchar(5) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
ApplicationContext.xml配置文件中的内容:
<?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.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 数据库1 -->
<bean id="db1" class="com.atomikos.jdbc.SimpleDataSourceBean" init-method="init" destroy-method="close">
<property name="uniqueResourceName">
<value>mysql/main</value>
</property>
<property name="xaDataSourceClassName">
<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>
</property>
<property name="xaDataSourceProperties">
<value>URL=jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8;user=root;password=root</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>
<!-- 数据库2 -->
<bean id="db2" class="com.atomikos.jdbc.SimpleDataSourceBean" init-method="init" destroy-method="close">
<property name="uniqueResourceName">
<value>mysql/secondary</value>
</property>
<property name="xaDataSourceClassName">
<value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</value>
</property>
<property name="xaDataSourceProperties">
<value>URL=jdbc:mysql://localhost:3306/log?useUnicode=true&characterEncoding=utf-8;user=root;password=root</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="userTransactionManager" init-method="init" destroy-method="close"
class="com.atomikos.icatch.jta.UserTransactionManager">
<property name="forceShutdown" value="true" />
</bean>
<bean id="userTransactionImp" class="com.atomikos.icatch.jta.UserTransactionImp">
<property name="transactionTimeout" value="300"/>
</bean>
<bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="transactionManager" ref="userTransactionManager" />
<property name="userTransaction" ref="userTransactionImp" />
<property name="allowCustomIsolationLevels" value="true"/>
</bean>
<!-- 配置事务传播特性 -->
<tx:advice id="txAdvice" transaction-manager="jtaTransactionManager">
<tx:attributes>
<tx:method name="save*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="add*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="create*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="insert*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="del*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="update*" propagation="REQUIRED" rollback-for="Exception"/>
<tx:method name="*" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 事务管理 -->
<aop:config proxy-target-class="true">
<aop:advisor pointcut="execution(* com.zdp.service..*.*(..))" advice-ref="txAdvice"/>
</aop:config>
<bean id="userDao" class="com.zdp.dao.UserDao">
<property name="dataSource" ref="db1" />
</bean>
<bean id="logDao" class="com.zdp.dao.LogDao">
<property name="dataSource" ref="db2" />
</bean>
<bean id="userService" class="com.zdp.service.UserService">
<property name="userDao" ref="userDao" />
<property name="logDao" ref="logDao" />
</bean>
</beans>
配置文件中的SimpleDataSourceBean类的介绍:
http://blog.csdn.net/guchuanlong/article/details/12600337
2 下载附件中的内容,下载地址:http://download.csdn.net/download/zdp072/7950391
导入eclipse中,运行UserTest类中的testSave()方法,成功后2个表中都插入了数据。
模拟异常情况,因为log表的content字段长度是5,如果插入的数据长度超过5,就会异常,模拟一下这种情况,当发生异常时,2个表中都不会插入数据,即事务要么全部成功,要么全部不成功,测试通过,你自己可以试试。(备注:这个例子是网上找的,感谢这个同学)