You probably need to clear the plugin cache. Please see this information in the Qt docs.

I hope you get it working.

I just followed all the steps and get all the qmysql*.dll.

1st of all i’ve installed Mysql, then i created C:\Qt and then i put QT SDK 4.7.3 (c:\qt\4.7.3), then ive pasted Mingw (c:\qt\mingw) then i put mingw-utils (just bin files) into c:\qt\mingw\bin, then ive added all bin folders into PATH, do all the steps and get into C:\Qt\4.7.3\plugins\sqldrivers qsqlmysql4.dll qsqlmysqld4.dll libqsqlmysql4.a libqsqlmysqld4.a
The lat step of this tutorial tooked about 4 hours (mingw32-make step) (i have intel i3 8gigs hd raptors 11k rpm etc)
I’ve installed QT Creator without MinGw option checked (thats because i had Mingw already)

When i start QT creator all is fine, he see all the libraries, but when i try to test with an example i just get
QSqlDatabase: available drivers: QSQLITE QODBC3 QODBC
“Driver not loaded Driver not loaded”

Im working on Windows 7 x64, MingW 440, Mingw Utils 0.3, Qt SDK 4.7.3 and Qt Creator 2.2.1

How can i test if the qmysql*.dll compiled in this tutorial works fine? im new in C++, but maybe you have some example to test it.

Thanks in advance and excuse my english pls

But since I was getting a message about doc.pri I downloaded it from this site (on the right you can see download xxxfilename as tat.gz). Download and unzip then copy the whole doc folder under QtSDK\QtSources\4.7.3:
http://qt.gitorious.org/qt-labs/simulator/trees/1bf4e3ba95ca96d311d5eb4511cd0fd9b1692ef4

I also had another problem with demos and examples because there was a warning message about not being able to find examples.pro and demos.pro. So all you have to do is to search through QtSDK folder then copy and paste them under the QtSDK\QtSources\4.7.3. Et voila!

(Sorry here the full code, ignore the previous reply)

D:\QtSDK\QtSources\4.7.3\src\plugins\sqldrivers\mysql>qmake "INCLUDEPATH+=C:\MyS
QL5\include" "LIBS+=C:\MYSQL5\lib\libmysql.lib" mysql.pro
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.



D:\QtSDK\QtSources\4.7.3\src\plugins\sqldrivers\mysql>qmake "
QL5\include" "LIBS+=C:\MYSQL5\lib\libmysql.lib" mysql.pro
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.


One of my older machines spent a couple of hours building Qt. My newer ( and slightly over the top fancy) build-server spends a handful of minutes. But thats with raided high-end ssd’s, and a lot of stuff happening in parallell.

‘make -j’ is my friend.

Sorry for the late reply.

Have a look at this url: http://doc.trolltech.com/latest/deployment-plugins.html#the-plugin-cache

Short story; you need to use regedit and nuke some keys. That’s all there is to it. Oh, and use dependency-walker to make sure that all the required files are where they are needed.

Best of luck!

at the last step when running mingw32-make. How long should it or does it take to build the plugin .dll files?

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QODBC3 QODBC

you said something about “clear the cache plugin” but i don’t know what it means.
could you help me?