The JDBC connection fails in linux, and the driver cannot be found.

If the JDBC connection fails in linux, the driver-Linux general technology-Linux programming and kernel information cannot be found. for details, refer to the following section. I have downloaded the driver connection rack packages under JAVA/LIB, the project LIB, and TOMCAT/lib, the TOMCAT/COMMON and/SHARE directories I mentioned on the Internet are not found in TOMCAT, and the classpath of the/ect/profile file is configured at the same time:
Export CLASSPATH = $ CLASSPATH: $ CATALINA_HOME/common/lib: $ JAVA_HOME/lib/mysql-connector-java-3.1.12-bin.jar
In this way, com. mysql. jdbc. Driver cannot be found during MYECLIPSE connection.
I have a problem with my configuration ..