Reza, please place your database file inside dbs directory of root. Note that I mean your database file created by MySQL that manually locate inside /var/lib/mysql/.
Look at these links.
http://www.mkyong.com/mysql/where-does-mysql-stored-the-data-in-my-harddisk/
http://www.linuxforums.org/forum/servers/54215-moving-mysql-datafile-another-location.html
You can do this easily by just copying target file inside destination directory of change mysql configuration to change database file directory,
Good luck.