my colleague send a .sql file to me , which is mysqldump from linux mysql db , I want to use XAMPP ( running in windows ) to connect it , I tried to put this files ( .php , .sql files ) to datadir , but still not connect it , the error is as below.

"throw new CDbException('CDbConnection failed to open the DB connection: '." , it seem can not connect the db ,

Would advise does XAMPP supports the .sql db which export from mysql db ? do I need to install any program / driver to use it ? what is the possible reason of the error ? thanks

XAMPP runs MySQL so the import shouldn't be any problem. XAMPP comes with PHPMyAdmin so you could use that to import a database if you don't want to use the command line.
*Do make a backup before messing with databases.
**Please note XAMPP is experimental: you should avoid exposing it to public / hostile networks.

thanks reply ,

does it mean XAMPP is not support to use SQL db , it only support mysql db , so that I have to import the data to mysql db ?

thanks

As Moderator said, you should use mysql client i.e. phpmyadmin to import export files. If your file is in .sql format with correct syntax of queries, it should be imported by mysql.

You can try command line to import a database.

If you do not have username password, it means it may be root and blank. In case you can try
when it asks for password, Just press the return key without enter anything.
If you are not able to log in using host "localhost", you can try your IP or 127.0.0.1

thanks reply ,

The .sql files are exported from linux , what I would like to do is import this files to mysql db in windows ( not in linux ) , phpmyadmin can do that ? thanks

Yes phpmyadmin can do that.
The default import file size may be 2 MB but you can increase in your php.ini.