mssql 2000 支持xa事务的设置

最新推荐文章于 2025-03-03 19:47:27 发布

Cooper_Lyt

最新推荐文章于 2025-03-03 19:47:27 发布

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分类专栏： Java 文章标签： sqlserver jboss properties descriptor jdbc encoding

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先骂一下狗日的微软。让我费了一翻周折。

1.mssql的jdbc驱动：之前一直使用三个jar的那个驱动。但在使用seam-gen生成项目时要求指定jar时只让指定一个文件。所以无奈上网查找，发现已经有新版的JDBC驱动是单个文件的，但是又分为jdk1.6的和1.6的，使用之后又发现驱动的包名被换了。由“com.microsoft.jdbc.sqlserver”改为“com.microsoft.sqlserver.jdbc”，我这才明白为什么好多java的工具提供的默认驱动名为什么会是反的，

2.由于要使用多个数据库所以要作用XA数据源，用来支持JTA的分布式事务，我用的是jboss as 5.1 所以找到mssql-xa-ds.xml来修改，改好后如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE datasources
        PUBLIC "-//JBoss//DTD JBOSS JCA Config 1.5//EN"
        "http://www.jboss.org/j2ee/dtd/jboss-ds_1_5.dtd">
<datasources>
    <xa-datasource>
        <jndi-name>house_mssql_xa_datasource</jndi-name>
        <isSameRM-override-value>false</isSameRM-override-value>
        <xa-datasource-class>com.microsoft.sqlserver.jdbc.SQLServerXADataSource</xa-datasource-class>

        <xa-datasource-property name="ServerName">192.168.1.200</xa-datasource-property>
        <xa-datasource-property name="DatabaseName">DGHouseInfo</xa-datasource-property>
        <xa-datasource-property name="SelectMethod">cursor</xa-datasource-property>
        <xa-datasource-property name="URL">jdbc:sqlserver://192.168.1.200:1433</xa-datasource-property>
        <user-name>sa</user-name>
        <password>×××</password>

        <!-- The minimum connections in a pool/sub-pool. Pools are lazily
        constructed on first use -->
        <min-pool-size>5</min-pool-size>

        <!-- The maximum connections in a pool/sub-pool -->
        <max-pool-size>20</max-pool-size>
        <metadata>
         <type-mapping>MS SQLSERVER2000</type-mapping>
      </metadata>
    </xa-datasource>


    <xa-datasource>
        <jndi-name>ensure_mssql_xa_datasource</jndi-name>
        <isSameRM-override-value>false</isSameRM-override-value>
        <xa-datasource-class>com.microsoft.sqlserver.jdbc.SQLServerXADataSource</xa-datasource-class>
        <xa-datasource-property name="ServerName">192.168.1.200</xa-datasource-property>
        <xa-datasource-property name="DatabaseName">EnsureHouseRecord</xa-datasource-property>
        <xa-datasource-property name="SelectMethod">cursor</xa-datasource-property>
        <xa-datasource-property name="URL">jdbc:sqlserver://192.168.1.200:1433</xa-datasource-property>
        <user-name>sa</user-name>
        <password>×××</password>
        <!-- The minimum connections in a pool/sub-pool. Pools are lazily
        constructed on first use -->
        <min-pool-size>5</min-pool-size>

        <!-- The maximum connections in a pool/sub-pool -->
        <max-pool-size>20</max-pool-size>
       <metadata>
         <type-mapping>MS SQLSERVER2000</type-mapping>
      </metadata>
    </xa-datasource>


</datasources>

对印的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Persistence deployment descriptor for dev profile -->
<persistence xmlns="http://java.sun.com/xml/ns/persistence" 
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" 
             version="1.0">
             
   <persistence-unit name="house-mssql-xa-ds" transaction-type="JTA">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:house_mssql_xa_datasource</jta-data-source>
      <jar-file>WEB-INF/lib/house-mssql-po-1.0-SNAPSHOT.jar</jar-file>
      <exclude-unlisted-classes/>
      <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
         <property name="hibernate.hbm2ddl.auto" value="none"/>
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.format_sql" value="true"/>
         <property name="hibernate.default_schema" value="dbo"/>
         <property name="jboss.entity.manager.factory.jndi.name" value="java:/house-mssql-xaEntityManagerFactory"/>
      </properties>
   </persistence-unit>

   <persistence-unit name="ensure-mssql-xa-ds" transaction-type="JTA">
      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <jta-data-source>java:ensure_mssql_xa_datasource</jta-data-source>
      <properties>
         <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
         <property name="hibernate.hbm2ddl.auto" value="none"/>
         <property name="hibernate.show_sql" value="true"/>
         <property name="hibernate.format_sql" value="true"/>
         <property name="hibernate.default_schema" value="dbo"/>
         <property name="jboss.entity.manager.factory.jndi.name" value="java:/ensure-mssql-xaEntityManagerFactory"/>
      </properties>
   </persistence-unit>

    
</persistence>

但是配好之后程序异常：

Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection

(javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction .... Could not enlist in transaction on entering meta-aware object!;

网上查了一下，说是如果jboss中一次事务如果包含两个数据源就会出现上述第二个异常，解决方式是修改下jboss的配置:

conf/jbossjta-properties.xml (JBoss-4.x) or conf/jbossts-properies.xml (JBoss 5)
在<properties depends="arjuna" name="jta">
节点下增加：

<property name="com.arjuna.ats.jta.allowMultipleLastResources" value="true"/>

参考:

http://community.jboss.org/wiki/Multiple1PC

http://community.jboss.org/thread/158421

http://topic.youkuaiyun.com/u/20090331/22/c7752efc-de60-470a-930c-6a739bf8c56d.html

http://ruowu.iteye.com/blog/725591

但是我修改了之后无效，没有效果，异常依旧.

后来我就又上网查，mssql2000的xa事务配置.但是网上都是说mssql 2005的，我依样画瓢，终于好使了。原来mssql要支持xa事务，还要给mssql打上补丁。补丁就在JDBC驱动包中。还要开启DTC服务，并进行COM设置（mssql的分布式事务是通过com+来实现的，汉），具体参见:

http://tantan.iteye.com/blog/617442

这大概就是出现第一个异常 Cannot open connection的原因了。另外区别这两个异常的关键在于，jboss有没有这个警告：

WARN Adding multiple last resources is disallowed. Current resource is <resource>