JTA

通过webwork+spring+hibernatep实现分布式事务(JTA)，采用容器必须应用服务器(weblogic,webspere,jboss,jonas等)。实现JTA主要有三个步骤，1.设置数据源，2.配置srping,及hiberante相应配置文件，3.在程序中编写代码。测试时候采用二个数据库，全是采用mysql +weblogic4.0版本。

1.在weblogic设置数据源

   首先配置二个连接池：mysqlpool1、mysqlpool2,分别对应二个两个数据库 test1,test2

   然后配置二个txDataSource：ds1、ds2

配置如下：


    <JDBCConnectionPool DriverName="org.gjt.mm.mysql.Driver"

        Name=" mysqlpool1"
        PasswordEncrypted="{3DES}9hRoxaA7+106d9AbXZ8e2g=="
        Properties="user=root" Targets="myserver"
        TestTableName="SQL SELECT 1" URL="jdbc:mysql://localhost:3306/test1"/>

   <JDBCConnectionPool DriverName="org.gjt.mm.mysql.Driver"

        Name=" mysqlpool2"
        PasswordEncrypted="{3DES}9hRoxaA7+106d9AbXZ8e2g=="
        Properties="user=root" Targets="myserver"
        TestTableName="SQL SELECT 1" URL="jdbc:mysql://localhost:3306/test1"/>

    <JDBCTxDataSource JNDIName="ds1" Name=" mysqlpool1"
        PoolName="mysqlpool1" Targets="myserver"/>

    <JDBCTxDataSource JNDIName="ds2" Name=" mysqlpool1"
        PoolName="mysqlpool2" Targets="myserver"/>

2.配置srping,及hiberante相应配置文件
配置二个相对应的 hibernate.cfg..xml文件:Test1.cfg.xml、Test2.cfg.xml配置文件
主要是引用应用服务器的数据源及Mapping files相关配置

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.datasource">
           Ds1
        </property>

        <!-- following is c3p0 connection pool setting-->
        <property name="hibernate.c3p0.min_size">

            5
        </property>

        <property name="hibernate.c3p0.max_size">

            500
        </property>

        <property name="hibernate.c3p0.timeout">

            1800
        </property>

        <property name="hibernate.c3p0.max_statements">

            50

        </property> 

        <!--dialect-->

        <property name="dialect">
            net.sf.hibernate.dialect.MySQLDialect
        </property>

        <!-- show sql -->
        <property name="hibernate.show_sql">
            True
        </property>

        <!-- use out join-->

        <property name="hibernate.use_outer_join">
            True
        </property>

       <!--use cache-->

       <property name="hibernate.cache.use_query_cache"> 

       </property>

        <!-- Transaction Manager Type, here use JDBC Transaction

        <property name="hibernate.transaction.factory_class">
            net.sf.hibernate.transaction.JDBCTransactionFactory
        </property>
       -->

        <property name="transaction.factory_class">
            net.sf.hibernate.transaction.JTATransactionFactory
        </property>
      <property name="jta.UserTransaction">
       java:comp/UserTransaction
       </property>

       <!-- Mapping files -->
       <mapping resource="com/eastsun/model/Test2.hbm.xml"/>
       <mapping resource="com/eastsun/model/Test.hbm.xml"/>
    </session-factory>
</hibernate-configuration> 

另外一个配置文件就同基本上一样的。只修改hibernate.connection.datasource的属性值为ds2

Spring.xml配置文件

主要是配置二个数据源相对应的sessionFactory,再配置一个JTA(myTransactionManager)，然后再配置bean。在两个Bean后引用对应的sessonFactory及JTA(myTransactionManager)

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="sessionFactory1" class="org.springframework.orm.hibernate.LocalSessionFactoryBean" singleton="true">
       <property name="configLocation">
       <value>classpath:spring1.cfg.xml</value>
       </property>

       </bean>

       <bean id="sessionFactory2" class="org.springframework.orm.hibernate.LocalSessionFactoryBean" singleton="true">
       <property name="configLocation">
       <value>classpath:spring2.cfg.xml</value>
       </property>
       </bean>

    <bean id="myTransactionManager"
       class="org.springframework.transaction.jta.JtaTransactionManager" />

    <bean id="entityDao1"
       class="com.eastsun.common.persistence.EntityDaoImpl"
       singleton="true">
       <property name="sessionFactory">
           <ref bean="sessionFactory1" />

       </property>
    </bean>
    <bean id="entityDao2"
       class="com.eastsun.common.persistence.EntityDaoImpl"
       singleton="true">
       <property name="sessionFactory">
           <ref bean="sessionFactory2" />
       </property>
    </bean>
    <bean id="spring1"





       class="com.eastsun.businesslogic.test.Spring1Impl" singleton="true">





       <property name="sessionFactory">





           <ref bean="sessionFactory1" />





       </property>  





       <property name="transactionManager">





           <ref bean="myTransactionManager" />





       </property>





    </bean>





       <bean id="spring11"





       class="com.eastsun.businesslogic.test.Spring11Impl" singleton="true">





       <property name="sessionFactory">





           <ref bean="sessionFactory1" />





       </property>  





       <property name="transactionManager">





           <ref bean="myTransactionManager" />





       </property>





    </bean>











    <bean id="spring2"





       class="com.eastsun.businesslogic.test.Spring2Impl" singleton="true">





        <property name="sessionFactory">





           <ref bean="sessionFactory2" />





       </property>  





       <property name="transactionManager">





           <ref bean="myTransactionManager" />





       </property>





    </bean>





</beans>











3.       在程序中编写代码





在第一数据库插入数据库能正常插入，在另外一个数据库插入的时候没有加设置主键ID，这样就会出异常，如果第一次插入的数据也能回滚，不会持久化到数据库，这样就说明JTA事务成功了。





    public String insertData(String data){





        Session session = null;





        Transaction tx = null;





        Test test = new Test();





        try{





            AppLog.message("...........insertData...............................");





            session = getSession(true);





            Spring2 spring2 =(Spring2)ServiceLocatorOfTest.getInstance("spring1.xml").getService("spring2");





            spring2.insertData(UUIDGen.getUUID(),UUIDGen.getUUID());





            tx = session.beginTransaction();    





        





            test.setTestId(UUIDGen.getUUID());





            test.setName(data);





            session.save(test);





            tx.commit();





        }catch(Exception e){





            AppLog.message("...........insertData.....Exception..........................");





            





           try{ if(tx!=null)tx.rollback();}catch(Exception ex){};





            e.printStackTrace();





        }finally{





            try{





            if(session!=null){





                session.close();





            }





            }





            catch(Exception e1){





                e1.printStackTrace();





            }





        }





        return "success";





}