<?xml version="1.0" encoding="UTF-8"?>
<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="hongmin.ma" transaction-type="JTA">
        <jta-data-source>java:/jpaDemo</jta-data-source>
    </persistence-unit>
  
</persistence>

 

这代码可以在创建EJB工程的时候自动生成，但要注意写对数据源和unitName

注意和下面的数据源对比

数据源文件名为：mysql-ds.xml ，由D:/java_my/jboss-4.0.4.GA/docs/examples/jca下文件提供

放置路径：D:/java_my/jboss-4.0.4.GA/server/default/deploy

 

<datasources>
  <local-tx-datasource>
    <jndi-name>jpaDemo</jndi-name>
    <connection-url>jdbc:mysql://localhost:3306/test</connection-url>
    <driver-class>com.mysql.jdbc.Driver</driver-class>
    <user-name>root</user-name>
    <password>root</password>
    <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
    <!-- should only be used on drivers after 3.22.1 with "ping" support
    <valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name>
    -->
    <!-- sql to call when connection is created
    <new-connection-sql>some arbitrary sql</new-connection-sql>
      -->
    <!-- sql to call on an existing pooled connection when it is obtained from pool - MySQLValidConnectionChecker is preferred for newer drivers
    <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql>
      -->

    <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) -->
    <metadata>
       <type-mapping>mySQL</type-mapping>
    </metadata>
  </local-tx-datasource>
</datasources>