Library 'mysql' is not defined

[hobbyProgrammer]

@kshegunov Hi
Where exactly do I need to add message()?
In the main.cpp?

[SGaist]

Hi,

Looks like you are following the old instructions.

Take a look at the current Qt MySQL driver documentation. The parameters have changed.

[hobbyProgrammer]

@SGaist yes, but unfortunately, following the new instructions results in
Project ERROR: Could not find feature sql-mysql

[SGaist]

Based on your first post you are missing two dashes after the qmake call. The example from the documentation shows qmake -- and then the additional stuff. Please try that.

[hobbyProgrammer]

@SGaist so like:
qmake -- MYSQL_INCDIR=:C\MySQL\include "MYSQL_LIBDIR=C:\MySQL\lib"

[hobbyProgrammer]

This post is deleted!

[hobbyProgrammer]

This post is deleted!

[hobbyProgrammer]

@SGaist I tried that, but it still won't work. I also do not get the configuration screen where you can see which drivers are installed. Only when I do mingw32-make I see that it only goes to odbc and sqlite

C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR=:C\MySQL\include MYSQL_LIBDIR=C:\MySQL\lib

C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers>mingw32-make
cd odbc\ && ( if not exist Makefile C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -o Makefile C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\odbc\odbc.pro ) && mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Debug all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
cd sqlite\ && ( if not exist Makefile C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -o Makefile C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\sqlite\sqlite.pro ) && mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Debug all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'

Also this doesn't seem to work:

C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers>mingw32-make sub-mysql
mingw32-make: *** No rule to make target 'sub-mysql'.  Stop.

[SGaist]

You still have typos in your paths.

[hobbyProgrammer]

@SGaist in the mysql_incdir/mysql_libdir? or anywhere else?

[jsulm]

@hobbyProgrammer Please check better what you're writing:

MYSQL_INCDIR=:C\MySQL

Why is there a : ?

[hobbyProgrammer]

@jsulm hi,

yes I see. I tried again without the typo but it still didn't work

C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers>qmake -- MYSQL_INCDIR=C:\MySQL\include MYSQL_LIBDIR=C:\MySQL\lib

C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers>mingw32-make
cd odbc\ && ( if not exist Makefile C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -o Makefile C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\odbc\odbc.pro ) && mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Debug all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
cd sqlite\ && ( if not exist Makefile C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -o Makefile C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\sqlite\sqlite.pro ) && mingw32-make -f Makefile
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Release all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make -f Makefile.Debug all
mingw32-make[2]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[2]: Nothing to be done for 'all'.
mingw32-make[2]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/sqlite'

for some reason it just doesn't go to mysql

[Christian Ehrlicher]

Since qmake did not output anything according to your logs you should remove config.cache and start over (already told you above somewhere)

[hobbyProgrammer]

@Christian-Ehrlicher alright, I managed to get these files in C:/Qt/Qt5.13.1/5.13.1/Src/qtbase/src/plugins/sqldrivers/plugins/sqldrivers:

• qsqlmysql.dll
• qsqlmysqld.dll
• qsqlmysql.a
• qsqlmysqld.a

but for some reason I still get this error:

build-testDatabaseDrivers-Desktop_Qt_5_13_1_MinGW_64_bit-Debug\debug\testDatabaseDrivers.exe ...
("QSQLITE", "QODBC", "QODBC3", "QPSQL", "QPSQL7")
QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QODBC QODBC3 QPSQL QPSQL7

EDIT:

I copied the .dll files to C:/Qt/Qt<version>/<version>/mingw73_32/plugins/sqldrivers
and now it works

[hobbyProgrammer]

This worked for me and I used:

• OS: Windows
• Qt version: 5.13.1 and 5.13.2
• Qt creator: 4.10.1
• compiler: mingw73_32

Step by step:

1. Download msys & msysgit
2. Open the cmd of msys and type these commands (keep in mind that the second and third command do not contain cd. You need to call the .exe files from the mysql path):

• cd <path to libmysql.lib>
• C:/msysgit/mingw/bin/reimp.exe libmysql.lib
• C:/msysgit/mingw/bin/dlltool.exe -k -d libmysql.def -l libmysql.a

3. go to the qt cmd called: Qt <version> (<compiler>). Use the one with the mingw32 compiler.
4. execute the following commands:

• cd C:/Qt/Qt<version>/<version>/Src/qtbase/src/plugins/sqldrivers
• qmake sqldrivers.pro

5. open mysql.pro and make sure that it looks like this (change the include path and the lib path, but make sure that the include path and the depend path are the same!) and save after you finished editing it:

TARGET = qsqlmysql

HEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp

#QMAKE_USE += mysql
LIBS += -L'C:/MySQL/lib/'
-llibmysql

INCLUDEPATH += 'C:/MySQL/include'

DEPENDPATH += 'C:/MySQL/include'


OTHER_FILES += mysql.json

PLUGIN_CLASS_NAME = QMYSQLDriverPlugin
include(../qsqldriverbase.pri)

6. execute the following commands:

• qmake mysql.pro
• qmake "INCLUDEPATH+=<includepath>" "LIBS+=<libpath>/libmysql.lib" mysql.pro
• mingw32-make

7. go to C:/Qt/Qt<version>/<version>/Src/qtbase/src/plugins/sqldrivers/plugins/sqldrivers in the file explorer. You should see these four files now:

• qsqlmysql.dll
• qsqlmysqld.dll
• qsqlmysql.a
• qsqlmysqld.a

8. copy them and place them into: C:/Qt/Qt<version>/<version>/mingw73_32/plugins/sqldrivers