cannot open include file qsqldatabase

[toufic.dbouk]

Yes, I mean in which location.

it depends on what SQL management application your using. Check your applications guide to find out the location.

YI want to be able to install this application on any PC and to work there. I want to compile it in Ubuntu too and be able there to make the application work.

im not sure of this , but i would say you have to place the database in your project and specify the path for it

QString applicationPath= QApplication::applicationDirPath();/*get the application path*/

QString applicationPath= QApplication::applicationDirPath();/*get the application path*/

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then append a QDir::separator() , add the database name , and set it to the setDatabaseName(/*QString representing that database path*/)

I've tried to copy libmysql.dll to the folder where my .exe file is and to my qtcreator.exe folder and it's still not working

place the .dll file in plugins/sqldrivers directory.
you might need more than the .dll file , take a look at this thread http://qt-project.org/forums/viewthread/19122.
you can also try to load QODBC driver since it more of a general driver.
That's my suggestion , but ill wait with your for a reply from a more experienced developer to learn something new.