How to create the plugin of MYSQL for Qt

[kshots]

I recently ran into an issue with mysql (mariadb) in a linux environment - apparently, the 5.3.1 release ties to an older version of mysql that my system no longer supports (apparently, qt-5.3.1-release wants version .16, while my system uses .18). If you have this problem, an ldd of /path/to/qt5/plugins/sqldrivers/libqsqlmysql.so should show that it can't find your mysql libs. To fix this, go into the source directory at qtbase/src/plugins/sqldrivers/mysql, run qmake (specifically for 5.3.1, not the system qmake), and then make install.

[arsinte_andrei]

Even today Qt doesn't have a MySql proper plugin delivered with? any way.. thanks for this great job... that save me a lot of trouble I wish to do something similar with HeidiSql and this was a good start point.. Thanks again

[BlackStar]

You're all welcome :), for the guys who are asking for linux or Os X, but i don't know :(, try to fetch the doc.

[danny36]

Hello, I'm new to QT and I have installed QT from this installer on Windows 7 64bit:
qt-opensource-windows-x86-1.6.0-5-online.exe

but I don't see the src folder and I don't have a QT Sdk. How can I install the sdk? thanks.

[SGaist]

Hi and welcome to devnet,

You need to first install the sources. Use the installer for that

[danny36]

OK now I have installed the sources (maybe) and I have a folder called Src, this is my path: C:\Qt\5.3\Src.

I try to follow the tutorial but in my situation when prompt "reimp libmysql.dll" I receive this message:

"reimp: libmysql.dll: invalid or corrupt import library"

but if prompt "reimp libmysql.lib" seems to work.

[danny36]

now I'm arrived to step 5 but I think I have some problem, this is the ouput after lunch the command:

configure.exe -debug-and-release -platform win32-g++ -qt-sql-mysql -l mysql -I C:\mysql\include -L C:\mysql\lib

Creating qmake...
mingw32-make: Nothing to be done for 'first'.
Running configuration tests...
g++: error: CreateProcess: No such file or directory
mingw32-make: *** [arch.o] Error 1
Could not find output file: No such file or directory
WARNING: The DirectX SDK could not be detected:
There is no Direct X SDK installed or the environment variable "DXSDK_DIR" is
not set.
Disabling the ANGLE backend.

WARNING: Using OpenGL ES 2.0 without ANGLE.
Specify -opengl desktop to use Open GL.
The build will most likely fail.

[SGaist]

Either install the Direct X SDK or pass -opengl desktop to configure

[danny36]

I'm sorry and frustrated but
but unfortunately for me it is the first time with C++ and QT.
I lunch configure:

configure.exe -opengl desktop

and the result is:

g++ -c -o qlibraryinfo.o -DUNICODE -ffunction-sections -g -IC:\Qt\5.3\Src\qtbas
e/qmake -IC:\Qt\5.3\Src\qtbase/qmake/library -IC:\Qt\5.3\Src\qtbase/qmake/genera
tors -IC:\Qt\5.3\Src\qtbase/qmake/generators/unix -IC:\Qt\5.3\Src\qtbase/qmake/g
enerators/win32 -IC:\Qt\5.3\Src\qtbase/qmake/generators/mac -IC:\Qt\5.3\Src\qtba
se/qmake/generators/integrity -IC:\Qt\5.3\Src\qtbase\include -IC:\Qt\5.3\Src\qtb
ase\include/QtCore -IC:\Qt\5.3\Src\qtbase\include/QtCore/5.3.2 -IC:\Qt\5.3\Src\q
tbase\include/QtCore/5.3.2/QtCore -IC:\Qt\5.3\Src\qtbase/src/corelib/global -DHA
VE_QCONFIG_CPP -IC:\Qt\5.3\Src\qtbase\mkspecs\win32-g++ -IC:\Qt\5.3\Src\qtbase/t
ools/shared -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL -DQT_NO_TEXTC
ODEC -DQT_NO_UNICODETABLES -DQT_NO_COMPONENT -DQT_NO_COMPRESS -DQT_NO_THREAD -DQ
T_NO_QOBJECT -DQT_NO_GEOM_VARIANT -DQT_NO_DATASTREAM -DQT_CRYPTOGRAPHICHASH_ONLY
SHA1 -DQT_JSON_READONLY C:\Qt\5.3\Src\qtbase/src/corelib/global/qlibraryinfo.cp
p
g++: error: CreateProcess: No such file or directory
Makefile:275: recipe for target 'qlibraryinfo.o' failed
mingw32-make: *** [qlibraryinfo.o] Error 1
rm -f project.o option.o property.o main.o ioutils.o proitems.o qmakevfs.o qmake
globals.o qmakeparser.o qmakeevaluator.o qmakebuiltins.o makefile.o unixmake2.o
unixmake.o mingw_make.o winmakefile.o projectgenerator.o meta.o makefiledeps.o m
etamakefile.o xmloutput.o pbuilder_pbx.o msvc_vcproj.o msvc_vcxproj.o msvc_nmake
.o msvc_objectmodel.o msbuild_objectmodel.o gbuild.o cesdkhandler.o qtextcodec.o
qutfcodec.o qstring.o qstring_compat.o qstringbuilder.o qtextstream.o qiodevice
.o qmalloc.o qglobal.o qarraydata.o qbytearray.o qbytearraymatcher.o qdatastream
.o qbuffer.o qlist.o qfiledevice.o qfile.o qfilesystementry.o qfilesystemengine.
o qfsfileengine.o qfsfileengine_iterator.o qregexp.o qvector.o qbitarray.o qdir.
o qdiriterator.o quuid.o qhash.o qfileinfo.o qdatetime.o qstringlist.o qabstract
fileengine.o qtemporaryfile.o qmap.o qmetatype.o qsettings.o qsystemerror.o qlib
raryinfo.o qvariant.o qvsnprintf.o qlocale.o qlocale_tools.o qlinkedlist.o qnume
ric.o qcryptographichash.o qxmlstream.o qxmlutils.o qlogging.o qjson.o qjsondocument.o qjsonparser.o qjsonarray.o qjsonobject.o qjsonvalue.o qfilesystemengine_w
in.o qfilesystemiterator_win.o qfsfileengine_win.o qlocale_win.o qsettings_win.o
qsystemlibrary.o registry.o
g++ -c -o project.o -DUNICODE -ffunction-sections -g -IC:\Qt\5.3\Src\qtbase/qma
ke -IC:\Qt\5.3\Src\qtbase/qmake/library -IC:\Qt\5.3\Src\qtbase/qmake/generators
-IC:\Qt\5.3\Src\qtbase/qmake/generators/unix -IC:\Qt\5.3\Src\qtbase/qmake/genera
tors/win32 -IC:\Qt\5.3\Src\qtbase/qmake/generators/mac -IC:\Qt\5.3\Src\qtbase/qm
ake/generators/integrity -IC:\Qt\5.3\Src\qtbase\include -IC:\Qt\5.3\Src\qtbase\i
nclude/QtCore -IC:\Qt\5.3\Src\qtbase\include/QtCore/5.3.2 -IC:\Qt\5.3\Src\qtbase
\include/QtCore/5.3.2/QtCore -IC:\Qt\5.3\Src\qtbase/src/corelib/global -DHAVE_QC
ONFIG_CPP -IC:\Qt\5.3\Src\qtbase\mkspecs\win32-g++ -IC:\Qt\5.3\Src\qtbase/tools/
shared -DQT_BUILD_QMAKE -DQT_BOOTSTRAPPED -DPROEVALUATOR_FULL -DQT_NO_TEXTCODEC
-DQT_NO_UNICODETABLES -DQT_NO_COMPONENT -DQT_NO_COMPRESS -DQT_NO_THREAD -DQT_NO
QOBJECT -DQT_NO_GEOM_VARIANT -DQT_NO_DATASTREAM -DQT_CRYPTOGRAPHICHASH_ONLY_SHA1
-DQT_JSON_READONLY C:\Qt\5.3\Src\qtbase/qmake/project.cpp
g++: error: CreateProcess:* No such file or directory*
Makefile:196: recipe for target 'project.o' failed
mingw32-make: *** [project.o] Error 1
Building qmake failed, return code 2

[SGaist]

Just one question, do you only need to build the MySQL plugin ? If so, there's no need to rebuild Qt completely

[danny36]

This is the first time for me with C++ and QT so for me it's all new and I do not know what are the requirements needed to achieve my goal.
I want to make a windows application that keep some signal from a RFID antenna attached to notebook from serial and store data in a mysql database.
To start I want only to connect to mysql database and read a table data.

So I guess I need only mysql plugin.

[SGaist]

Then just compile the MySQL plugin like described in the documentation, no need to rebuild everything.

[kambokdol]

@
case "re":
include("$folderPath_php/write.php");
break;
case "re_ok":
include("$folderPath_php/write_ok.php");
break;
case "del":
include("$folderPath_php/del_ok.php");
break;
case "all_del_ok":
include("$folderPath_php/all_del_ok.php");
break;
case "all_move_ok":
include("$folderPath_php/all_move_ok.php");
break;
default:
include("$folderPath_php/list.php");
break;
@

[SGaist]

What does that message have to do with the current question ?

[masum]

what about other platform?

[SGaist]

Can you be more specific ?

[danny36]

Hi all,

after trying to build mysql plugin now I cannot to compile a simple hello world project, the error is:

g++: error: CreateProcess: No such file or directory

this is my debugger output:

@11:46:35: Running steps for project CEV-Crono...
11:46:35: Configuration unchanged, skipping qmake step.
11:46:35: Starting: "C:\Qt\5.3\mingw482_32\bin\mingw32-make.exe"
C:/Qt/5.3/mingw482_32/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory 'F:/WORKSPACE/CPP/build-CEV-Crono-Desktop_Qt_5_3_MinGW_32bit-Debug'
g++ -c -pipe -fno-keep-inline-dllexport -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I..\CEV-Crono -I"C:\Qt\5.3\mingw482_32\include" -I"C:\Qt\5.3\mingw482_32\include\QtWidgets" -I"C:\Qt\5.3\mingw482_32\include\QtGui" -I"C:\Qt\5.3\mingw482_32\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.3\mingw482_32\mkspecs\win32-g++" -o debug\main.o ..\CEV-Crono\main.cpp
g++: error: CreateProcess: No such file or directory
Makefile.Debug:341: recipe for target 'debug/main.o' failed
mingw32-make[1]: *** [debug/main.o] Error 1
mingw32-make[1]: Leaving directory 'F:/WORKSPACE/CPP/build-CEV-Crono-Desktop_Qt_5_3_MinGW_32bit-Debug'
Makefile:34: recipe for target 'debug' failed
mingw32-make: *** [debug] Error 2
11:46:35: The process "C:\Qt\5.3\mingw482_32\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project CEV-Crono (kit: Desktop Qt 5.3 MinGW 32bit)
When executing step "Make"
11:46:35: Elapsed time: 00:01.@

[root0x]

That would of been useful about 2 months ago, but thanks for posting it

[BlackStar]

I m sorry for not being able to reply ^^ cause i ve moved to the web development world for a moment, thus i have forgotten about this post! anyway the instructions i did were for Windows, but i never tried the other platforms tough :/ sorry! @massum, and a big thanks to @SGaist ^^

[SGaist]

Each platform has it's own gotchas but the *nix variants are generally more easy to deal with when it comes to dependencies like MySQL

You're welcome :)