build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded
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in the hope i can help someone: I provide various versions of qsqlmysql.dll here on Github
wrote on 2 Jan 2020, 07:12 last edited by hehedaozuiteng 1 Feb 2020, 07:51@thecodemonkey
Thank for you help anyway.
I solved it two days ago. BTW, I do not think 32 bit vision is useful, ( if I am wrong please point out.) Mysql's serves is only offer 64 bit, so the libmysql.dll is also 64 bits. That is why I cannot build the drive at first 2 days lol.If someone like me do not know this, he will kill his two days beautiful life XD.
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wrote on 23 May 2020, 20:18 last edited by
When I run this "qmake -- MYSQL_INCDIR="%Mysql%/MySQL Server 8.0/include" MYSQL_LIBDIR="%Mysql%/MySQL Server 8.0/lib" " it's show me the message " QMake has two modes, one mode for generating project files based on some heuristics, and the other for generating makefiles. Normally you shouldn't need to specify a mode, as makefile generation is the default mode for qmake, but you may use this to test qmake on an existing project " How can i solve this?
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in the hope i can help someone: I provide various versions of qsqlmysql.dll here on Github
wrote on 21 Apr 2021, 21:35 last edited by@thecodemonkey Thank you so much. Your files solved my problem.
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wrote on 13 May 2021, 08:03 last edited byThis post is deleted!
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in the hope i can help someone: I provide various versions of qsqlmysql.dll here on Github
wrote on 29 Jun 2023, 12:34 last edited by@thecodemonkey man I am using qt6.5.1, when I try to compile the driver it says that it doesn't recognize some lines of code when trying to build it... I am following this (the official qt documentation).. I think it doesn't find the mingw compiler.. I installed a new one but it does not work, it isn't recognized by the system also I'm using windows 11.. should I show you what are the errors? (I warn you, they are a lot)
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@thecodemonkey man I am using qt6.5.1, when I try to compile the driver it says that it doesn't recognize some lines of code when trying to build it... I am following this (the official qt documentation).. I think it doesn't find the mingw compiler.. I installed a new one but it does not work, it isn't recognized by the system also I'm using windows 11.. should I show you what are the errors? (I warn you, they are a lot)
@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
it isn't recognized by the system
If you want to build in a terminal on Windows then you should always use the terminal provided by Qt. If you installed Qt for MinGW you should have an entry in Windows Start menu to open the terminal preconfigured to use MinGW and Qt.
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@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
it isn't recognized by the system
If you want to build in a terminal on Windows then you should always use the terminal provided by Qt. If you installed Qt for MinGW you should have an entry in Windows Start menu to open the terminal preconfigured to use MinGW and Qt.
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@cpplegend No, there are always things one has to learn when doing something for the first time :-)
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@cpplegend No, there are always things one has to learn when doing something for the first time :-)
wrote on 29 Jun 2023, 13:05 last edited by@jsulm thank you..
by the way it doesn't workwhen I build it I get this:
[15/25] Building RC object mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
FAILED: mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
C:\Qt\Tools\mingw1120_64\bin\windres.exe -O coff -DMINGW_HAS_SECURE_API=1 -DQMYSQLDriverPlugin_EXPORTS -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x040800 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_PLUGIN -DQT_SQL_LIB -DQT_WARN_DEPRECATED_UP_TO=0x070000 -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_autogen/include -I C:/Qt/6.5.1/Src/qtbase/src/plugins/sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/include -I "C:/Program Files/MySQL/MySQL Connector C 6.1/include" -I C:/Qt/6.5.1/mingw_64/include/QtCore -I C:/Qt/6.5.1/mingw_64/include -I C:/Qt/6.5.1/mingw_64/mkspecs/win32-g++ -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1/QtCore -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1/QtSql -I C:/Qt/6.5.1/mingw_64/include/QtSql C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_resource.rc mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
cc1.exe: fatal error: Files/MySQL/MySQL: No such file or directory
compilation terminated.
cc1.exe: fatal error: Connector: No such file or directory
compilation terminated.
cc1.exe: fatal error: C: No such file or directory
compilation terminated.
cc1.exe: fatal error: 6.1/include: No such file or directory
compilation terminated.
C:\Qt\Tools\mingw1120_64\bin\windres.exe: preprocessing failed.
[22/25] Building C object sqlite/CMakeFiles/QSQLiteDriverPlugin.dir/C_/Qt/6.5.1/Src/qtbase/src/3rdparty/sqlite/sqlite3.c.obj
ninja: build stopped: subcommand failed. -
@jsulm thank you..
by the way it doesn't workwhen I build it I get this:
[15/25] Building RC object mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
FAILED: mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
C:\Qt\Tools\mingw1120_64\bin\windres.exe -O coff -DMINGW_HAS_SECURE_API=1 -DQMYSQLDriverPlugin_EXPORTS -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x040800 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_PLUGIN -DQT_SQL_LIB -DQT_WARN_DEPRECATED_UP_TO=0x070000 -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_autogen/include -I C:/Qt/6.5.1/Src/qtbase/src/plugins/sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/include -I "C:/Program Files/MySQL/MySQL Connector C 6.1/include" -I C:/Qt/6.5.1/mingw_64/include/QtCore -I C:/Qt/6.5.1/mingw_64/include -I C:/Qt/6.5.1/mingw_64/mkspecs/win32-g++ -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1/QtCore -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1/QtSql -I C:/Qt/6.5.1/mingw_64/include/QtSql C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_resource.rc mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
cc1.exe: fatal error: Files/MySQL/MySQL: No such file or directory
compilation terminated.
cc1.exe: fatal error: Connector: No such file or directory
compilation terminated.
cc1.exe: fatal error: C: No such file or directory
compilation terminated.
cc1.exe: fatal error: 6.1/include: No such file or directory
compilation terminated.
C:\Qt\Tools\mingw1120_64\bin\windres.exe: preprocessing failed.
[22/25] Building C object sqlite/CMakeFiles/QSQLiteDriverPlugin.dir/C_/Qt/6.5.1/Src/qtbase/src/3rdparty/sqlite/sqlite3.c.obj
ninja: build stopped: subcommand failed.@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
cc1.exe: fatal error: Files/MySQL/MySQL: No such file or directory
You have paths with spaces which are often problematic, just like in this case.
Install the MySQL client lib in a folder without spaces. -
@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
cc1.exe: fatal error: Files/MySQL/MySQL: No such file or directory
You have paths with spaces which are often problematic, just like in this case.
Install the MySQL client lib in a folder without spaces.wrote on 29 Jun 2023, 13:34 last edited by@jsulm it still doesn't work, it's another error now: [15/25] Building RC object mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
FAILED: mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
C:\Qt\Tools\mingw1120_64\bin\windres.exe -O coff -DMINGW_HAS_SECURE_API=1 -DQMYSQLDriverPlugin_EXPORTS -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x040800 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_PLUGIN -DQT_SQL_LIB -DQT_WARN_DEPRECATED_UP_TO=0x070000 -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_autogen/include -I C:/Qt/6.5.1/Src/qtbase/src/plugins/sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/include -I "C:/Program Files/MySQL/MySQL_ConnectorC6.1/include" -I C:/Qt/6.5.1/mingw_64/include/QtCore -I C:/Qt/6.5.1/mingw_64/include -I C:/Qt/6.5.1/mingw_64/mkspecs/win32-g++ -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1/QtCore -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1/QtSql -I C:/Qt/6.5.1/mingw_64/include/QtSql C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_resource.rc mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
cc1.exe: fatal error: Files/MySQL/MySQL_ConnectorC6.1/include: No such file or directory
compilation terminated.
C:\Qt\Tools\mingw1120_64\bin\windres.exe: preprocessing failed.
[22/25] Building C object sqlite/CMakeFiles/QSQLiteDriverPlugin.dir/C_/Qt/6.5.1/Src/qtbase/src/3rdparty/sqlite/sqlite3.c.obj
ninja: build stopped: subcommand failed. -
@jsulm it still doesn't work, it's another error now: [15/25] Building RC object mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
FAILED: mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
C:\Qt\Tools\mingw1120_64\bin\windres.exe -O coff -DMINGW_HAS_SECURE_API=1 -DQMYSQLDriverPlugin_EXPORTS -DQT_CORE_LIB -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_UP_TO=0x040800 -DQT_EXPLICIT_QFILE_CONSTRUCTION_FROM_PATH -DQT_NO_CAST_FROM_ASCII -DQT_NO_CAST_TO_ASCII -DQT_NO_DEBUG -DQT_NO_EXCEPTIONS -DQT_NO_JAVA_STYLE_ITERATORS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_PLUGIN -DQT_SQL_LIB -DQT_WARN_DEPRECATED_UP_TO=0x070000 -DUNICODE -DWIN32 -DWIN64 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -D_UNICODE -D_WIN64 -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_autogen/include -I C:/Qt/6.5.1/Src/qtbase/src/plugins/sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql -I C:/Qt/6.5.1/mingw_64/build-sqldrivers/include -I "C:/Program Files/MySQL/MySQL_ConnectorC6.1/include" -I C:/Qt/6.5.1/mingw_64/include/QtCore -I C:/Qt/6.5.1/mingw_64/include -I C:/Qt/6.5.1/mingw_64/mkspecs/win32-g++ -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtCore/6.5.1/QtCore -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1 -I C:/Qt/6.5.1/mingw_64/include/QtSql/6.5.1/QtSql -I C:/Qt/6.5.1/mingw_64/include/QtSql C:/Qt/6.5.1/mingw_64/build-sqldrivers/mysql/QMYSQLDriverPlugin_resource.rc mysql/CMakeFiles/QMYSQLDriverPlugin.dir/QMYSQLDriverPlugin_resource.rc.obj
cc1.exe: fatal error: Files/MySQL/MySQL_ConnectorC6.1/include: No such file or directory
compilation terminated.
C:\Qt\Tools\mingw1120_64\bin\windres.exe: preprocessing failed.
[22/25] Building C object sqlite/CMakeFiles/QSQLiteDriverPlugin.dir/C_/Qt/6.5.1/Src/qtbase/src/3rdparty/sqlite/sqlite3.c.obj
ninja: build stopped: subcommand failed.@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
it's another error now
It's same type of error - you have spaces in your paths.
Did you install the client library in a path without spaces?
If so then please start from clean build folder. -
Just want to confirm @jsulm is correct, I see a space here:
-I "C:/Program Files/MySQL/MySQL_ConnectorC6.1/include" -wrote on 29 Jun 2023, 13:48 last edited by cpplegend@hskoglund lol program files hahahhaha haven't seen it, because I am italian the name was "programmi" without any space, thank you by the way
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@hskoglund lol program files hahahhaha haven't seen it, because I am italian the name was "programmi" without any space, thank you by the way
@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
because I am italian the name was "programmi"
Yes, Windows tries to hide things from the user :-)
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@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
because I am italian the name was "programmi"
Yes, Windows tries to hide things from the user :-)
wrote on 29 Jun 2023, 14:14 last edited by cpplegend@jsulm yeah... now it worked thank you I am so happy, I have been trying to build this driver for 4 days, now it worked and I have the build, now it should work or I have to do anything else? because I tried to instantiate a connection to a database in mysql and it doesn't work, it still says Driver not loaded.
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@jsulm yeah... now it worked thank you I am so happy, I have been trying to build this driver for 4 days, now it worked and I have the build, now it should work or I have to do anything else? because I tried to instantiate a connection to a database in mysql and it doesn't work, it still says Driver not loaded.
@cpplegend Did you also did "make install" step?
To debug plug-in problems you can set QT_DEBUG_PLUGINS variable before running the app and check the output. See https://doc.qt.io/qt-6/debug.html
My guess is that the MySQL client library cannot be found. I'm not sure, but I think you need to copy it to same location as the plug-in. -
@cpplegend Did you also did "make install" step?
To debug plug-in problems you can set QT_DEBUG_PLUGINS variable before running the app and check the output. See https://doc.qt.io/qt-6/debug.html
My guess is that the MySQL client library cannot be found. I'm not sure, but I think you need to copy it to same location as the plug-in.wrote on 29 Jun 2023, 14:33 last edited byThis post is deleted! -
@cpplegend Did you also did "make install" step?
To debug plug-in problems you can set QT_DEBUG_PLUGINS variable before running the app and check the output. See https://doc.qt.io/qt-6/debug.html
My guess is that the MySQL client library cannot be found. I'm not sure, but I think you need to copy it to same location as the plug-in. -
@cpplegend said in build QMYSQL driver under windows 10, a sample solution for QSqlDatabase: QMYSQL driver not loaded:
what should I do now?
Set QT_DEBUG_PLUGINS env variable before starting your app. Either in QtCreator in "Run Environment" of your project or, if you start your app manually in a terminal, using "export QT_DEBUG_PLUGINS=1". Then check the output of the application to see why the plug-in is not loaded.
