"too complicated and is not working may"

"not working" isn't an error report. Consider reading and understanding How do I post a question effectively?. You load CGI but seem to be ignoring it!? If you are starting a new project using CGI, don't. It's very old and has lots of issues. Consider using a modern framework like Dancer. Get into the habbit of reading the documentation and example code provided.

Read the section on placeholders and bind variables from the DBI documentation. Never forget little Bobby Tables.

If you insist on loading (or actually using) CGI work your way through Ovid's CGI Course. You'll learn how to actually use the features provided by the module and how to debug problems.