Hi, thank you for reply. Will try to reapply only changes as we did in the past in hope it will work. Will update this thread if manage to find something out.

I made several modifications ... but i think the properly modifications are In : QtSrc\qtbase\mkspecs\win32-g++\qmake.conf add QMAKE_LFLAGS += -static -static-libgcc QMAKE_CFLAGS_RELEASE -= -O2 QMAKE_CFLAGS_RELEASE += -Os -momit-leaf-frame-pointer DEFINES += QT_STATIC_BUILD In : QtSrc\qtbase\src\plugins\sqldrivers\oci\oci.pro add QMAKE_LFLAGS += oracle_home\oci\lib\msvc\oci.lib QMAKE_LFLAGS += oracle_home\oci\lib\msvc\ociw32.lib QMAKE_LFLAGS += oracle_home\oci\lib\msvc\oraocci11.lib LIBS += -Loracle_home\oci\lib\msvc -loci -lociw32 -loraocci11 INCLUDEPATH += oracle_home\oci\include cmd -static -debug-and-release -platform win32-g++ -prefix QtPath\Static -I C:\\OpenSSL-Win32\\include -L C:\\OpenSSL-Win32\\lib -opensource -confirm-license -c++std c++14 -nomake examples -skip qtdoc -skip wayland -skip purchasing -skip serialbus -skip qtserialport -skip script -skip scxml -skip speech -skip location -no-opengl -no-angle -qt-zlib -qt-pcre -qt-libpng -no-libjpeg -qt-freetype -sql-oci -I oracle_home\oci\include -L oracle_home\oci\lib\msvc try it. the other modifications do not matter

@SGaist Thanks for your help.. it's successfuly got connected finally.. i changed localhost\sqlexpress to localhost and it got connected.. what ever sqlexpress is there for. Thanks again

@Randomator Sir, download the Qt Sources, e.g current the sources available are qt-everywhere-opensource-src-5.5.1, After extracting cd C:\qt-everywhere-opensource-src-5.5.1\qtbase\src\plugins\sqldrivers\mysql then make sure you call qmake from Qt5.5, for this purpose you can type the complete path of the qmake. then use make and make install. I hope it will help you.

@AlanT1337 said: I think it was build in my normal Qt folder I suppose that's possible, if you're using the qmake from that location to run on the project file. In any case I'm glad it's working now.

Auto-replying : I just found this tutorial that will be very helpful.

Hi and welcome to devnet, What sources did you download ? You have an option in the installer to get the sources that matches your installed Qt. If you take the time to search the forum, you'll find several threads about the MySQL plugin and OS X.

You're understanding correctly... Well I just had to build it on my laptop for QT 5.51 because the current version of the driver wasn't working with mysql 5.5. It was quite a simple process... I wanted to try my program on a remote server, noticed the driver wasn't present at all, so just thought I'll build it myself to be sure it will be compatible with the version of mysql installed. You're right, I've found the package in my distribution and it is working well. (libqt5sql5-mysql on debian jessie) Thanks

Finally fixed it. I had the wrong file path to my shared library files.

Re-building the plugin to use your currently installed libmysqlclient_r would be the simple and easy path. Just grab the sources and follow the instruction in the database part of Qt's documentation.

That I can't comment on. You should ask the MySQL people about that matter.

First location is the Qt MySQL plugin Second location is the MySQL header file Looks like you're trying to mix a system installed Qt with your own install of Qt. which one are you currently using ?

@danks_ That is good to hear ! Could also been some kind of setup problem with 5_5 but yeah it does seems like a bug. I will try with 5_5 and see it it fails for me too. update: Tested win pure 5_5 install It worked by copying the DLLs ! ? Even worked with no sub sqldrivers folder ...! (in the release folder) But when moved out of the virtual machines it did want the sqldrivers folder to work. So the current version of 5.5 via the online installer does seems to work in regards to sql.?!

Yes, you can, they have restriction but no, external frameworks are not prohibited.

Hi and welcome to devnet, Did you install the MySQL client libraries on your OS X using e.g. macports or homebrew ?

God... finally got it working!!! Tried many libmysql.dlls and got one that works. Thanks @SGaist for your time :)

Hi and welcome to devnet, What option did you pass to configure when you built Qt ?

HI, if you use MSVC and not mingw you must replace the line C: \ Qt \ Qt5.4.0 \ Tools \ mingw482_32 \ bin \ mingw32-make.exe by nmake (cf Qt documentation) and I believe it's not recommended to use Qt 5.4.0 and MSVC,it's better tou use Qt 5.4.1 (binary compatiblity problems with 5.4.0 and MSVC)