Oracle驱动classes12.jar 与ojdbc14.jar的区别

简单的说，如果使用jdk1.2和jdk1.3就使用classes12.jar；如果使用的jdk1.4和jdk1.5的，就选用ojdbc14.jar。更加详细的Oracle官方有说明。

以下是Oracle JDBC官方文档的说法：
也就是随便翻译一下就理解了。
JDBC Thin for All Platforms 
classes12.jar (1,600,090 bytes) - for use with JDK 1.2 and JDK 1.3 
在低级JDK版本1.2与1.3中使用的驱动，虽然实际上在1.4，1.5中使用大部分情况也是OK的
classes12_g.jar (2,044,594 bytes) - same as classes12.jar, except that classes were compiled with "javac -g" and contain some tracing information. 
添加了编译调试信息的classes12.jar
classes12dms.jar (1,607,745 bytes) - same as classes12.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service. 
添加了支持Oracle动态检测服务的classes12.jar
classes12dms_g.jar (2,052,968 bytes) - same as classes12dms.jar except that classes were compiled with "javac -g" and contain some tracing information.  
添加了支持Oracle动态检测服务与编译调试信息的classes12.jar
ojdbc14.jar (1,545,954 bytes) - classes for use with JDK 1.4 and 1.5 
在高级JDK版本1.4与1.5中使用的驱动
下面三个同classes12.jar的情况
ojdbc14_g.jar (1,938,906 bytes) - same as ojdbc14.jar, except that classes were compiled with "javac -g" and contain some tracing information. 
ojdbc14dms.jar (1,553,561 bytes) - same as ojdbc14.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service. 
ojdbc14dms_g.jar (1,947,136 bytes) - same as ojdbc14dms.jar, except that classes were compiled with "javac -g" and contain some tracing information.  
orai18n.jar (1,645,114 bytes) - NLS classes for use with JDK 1.2, 1.3, 1.4, and 1.5. This jar file replaces the old nls_charset jar/zip files. 
ons.jar (48,492 bytes) - for use by the pure Java client-side Oracle Notification Services (ONS) deamon. 
demo.tar (604,160 bytes) or demo.zip (529,267 bytes) - contains sample JDBC programs. ......

 

驱动包classes12.jar用于JDK 1.2和JDK 1.3，而ojdbc14.jar用于JDK 1.4及以上，所以尽量不要使用classes12.jar；

针对不同的数据库版本选择相应版本的驱动包；

将驱动包置入应用启动的classpath中(jboss的lib或者项目lib)

可通过如下链接下载到对应的驱动包：http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/htdocs/jdbc9201.html