Oracle的JDBC驱动一直就是直接拿过来用，却不知道到底有什么具体的作用，今天看到lib目录下面有好几个JDBC驱动，觉得很繁琐，就上网查看了一下，发现的确是在包下面放多了东东，具体的oracle的解释如下：

JDBC Thin for All Platforms classes12.jar (1,594,191 bytes) - for use with JDK 1.2 and JDK 1.3 classes12_g.jar (2,038,127 bytes) - same as classes12.jar, except that classes were compiled with “javac -g” and contain some tracing information. classes12dms.jar (1,601,843 bytes) - same as classes12.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service. classes12dms_g.jar (2,046,467 bytes) - same as classes12dms.jar except that classes were compiled with “javac -g” and contain some tracing information. ojdbc14.jar (1,540,457 bytes) - classes for use with JDK 1.4 and 1.5 ojdbc14_g.jar (1,932,834 bytes) - same as ojdbc14.jar, except that classes were compiled with “javac -g” and contain some tracing information. ojdbc14dms.jar (1,548,006 bytes) - same as ojdbc14.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service. ojdbc14dms_g.jar (1,940,478 bytes) - same as ojdbc14dms.jar, except that classes were compiled with “javac -g” and contain some tracing information. orai18n.jar (1,645,109 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.