使用 Jboss 配置数据源代码
Jboss 4.0的开发人员版本是一个开源的应用服务器，他把HypersonicDB作为他的缺省数据库。然而，开发人员也许还要使用除了Hyperso
Jboss 4.0的开发人员版本是一个开源的应用服务器，他把HypersonicDB作为他的缺省数据库。然而，开发人员也许还要使用除了HypersonicDB以外其他种类的数据库，在这篇文章中我们将看到如何在Jboss上配置使用其他的数据库。
简介
Jboss4.0使用了JDBC配置文件来配置数据库连接，它为EJB和其它J2EE应用提供了数据源(data source)进行访问。如果你要使用HypersonicDB以外的数据库你就要修改这个配置文件。这篇文章将着重讲解下面的几个部分：
l Jboss的EJB部署描述符
l Oralce数据库的配置
l MySQL数据库的配置
l Sysbase数据库的配置
l DB2数据库的配置
l Infomix数据库的配置
Jboss的EJB部署描述符
standardjaws.xml （位于X:\jboss4\server\default\conf）是一个映射CMP 实体EJB的标准部署描述文件。它用于配置CMP实体EJB，你也可以使用jaws.xml代替。你可以把这个文件copy到ejb .jar文件中的META-INF目录下。这个文件用于描述下面的信息：
l 描述一个数据源和映射类型。
l 描述EJB映射的表
l 描述EJB的finder方法
l 描述类型映射
这里的数据源描述的是一个JNDI名称，可以通过这个JNDI来获得一个数据源连接池。Jboss4缺省的数据源使用的是HypersonicDB。如果使用其他的数据源你需要修改jaws.xml文件。
standardjbosscmp-jdbc.xml（位于X:\jboss4\server\default\conf）是配置Jboss CMP容器的标准部署描述文件，你也可以使用一个自定义的配置文件--jbosscmp-jdbc.xml来代替它。这个文件也放在EJB.jar文件的META-INF目录中。缺省使用的还是HypersonicDB作为数据库，这里也需要修改。
Oracle数据库的配置
Oracle以它的运行稳定和可靠成为了一个非常受欢迎的企业级数据库。要在Jboss 上配置使用Oracle的话我们要做的第一件事就是把Oracle的JDBC驱动程序复制到ClassPath下。我们把这个JDBC驱动程序复制到server/default/lib目录下。为了使用Oracle的事务处理数据源我们还要把/docs/examples/jca/oracle-xa-ds.xml复制到/server/default/deploy目录下。如果使用的事非事务处理的数据源，，就把/docs/examples/jca/oracle-ds.xml文件复制到/server/default/deploy目录下。
下一步，我们需要修改oracle-de.xml配置文件。其中的
Oracle OCI Type 2 Driver
Class: oracle.jdbc.driver.OracleDriver
URL: jdbc:oracle:oci8:@
Oracle OCI Thin Type 4 Driver
Class: oracle.jdbc.driver.OracleDriver
URL: jdbc:oracle:thin:@
Oracle OCI XA Type 2 Driver
Class: oracle.jdbc.xa.client.OracleXADataSource
URL: jdbc:oracle:thin:@
Oracle OCI Type 2 Driver
Class: oracle.jdbc.driver.OracleDriver
URL: jdbc:oracle:oci8:@
在Connection URL中
下一步，再修改standardjbosscmp-jdbc.xml 或 jbosscmp-jdbc.xml配置文件，设置
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