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Forum Update on Monday, May 27th 2025

QMYSQL driver not found Qt 6.5.1, I've tried all I found online, without success

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  • JonBJ JonB

    @cpplegend said in QMYSQL driver not found Qt 6.5.1, I've tried all I found online, without success:

    it said that those are incompatible...

    Did you do anything about my suggestion that a Debug version of the DLL may not be acceptable/loadable and you should try a Release version?

    Otherwise you might copy & paste the actual message rather than telling us "it said that those are incompatible...".

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    cpplegend
    wrote on last edited by
    #55

    @JonB hei so how do I build the release version?

    JonBJ 1 Reply Last reply
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    • C cpplegend

      @JonB hei so how do I build the release version?

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by JonB
      #56

      @cpplegend
      Some things you are really supposed to figure for yourself. Or if necessary look up in Help. In Creator you choose which configuration to build. You apparently currently have it on "Debug". You should change that to "Release" and rebuild. Note that the resulting DLL will no longer be in the .../x64/Debug/sqldrivers directory used when building for debug, if you need to copy the built file(s) you will need to copy from the new location.

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      • C cpplegend

        @Christian-Ehrlicher I have seen it, it is in the plugin folder, plugin folder is in the mingw folder...I also tried to put the sqldrivers folder into: C:\Users\ianno\OneDrive\Desktop\QTProjects\PROVE\imageDB_provaDiConnessione\x64\Debug\sqldrivers... I have in this folder these files:
        "qsqlite.debug"
        "qsqlite.dll"
        "qsqlmysql.debug"
        "qsqlmysql.dll"
        "qsqlodbc.debug"
        "qsqlodbc.dll"

        I simply don't understand what I should do, could you explain the right process? I know I am boring I have been asking here for days..but I really need to understand

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        thecodemonkey
        wrote on last edited by
        #57

        @cpplegend on the one hand you have posted a list of plugins plugins that clearly are in MinGW format (telling from .debug file extension), but on the other hand you posted paths containing msvc2019_64. You need to use the correct plugins for the compiler you use

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        • JonBJ JonB

          @cpplegend
          Some things you are really supposed to figure for yourself. Or if necessary look up in Help. In Creator you choose which configuration to build. You apparently currently have it on "Debug". You should change that to "Release" and rebuild. Note that the resulting DLL will no longer be in the .../x64/Debug/sqldrivers directory used when building for debug, if you need to copy the built file(s) you will need to copy from the new location.

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          cpplegend
          wrote on last edited by
          #58

          @JonB @thecodemonkey I really feel so stupid when you talk you obviously know more on this topic than me, please could you explain what I have to do because I am not understanding anything. what should I do now? should I download any other file? I am really sick of this plugin but I need to understand... I know I am boring, I always say the same thing, but it's because I don't understand, it's so difficult..if it is just coding I learn pretty fast, but these things are new to me

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          • C cpplegend

            @JonB @thecodemonkey I really feel so stupid when you talk you obviously know more on this topic than me, please could you explain what I have to do because I am not understanding anything. what should I do now? should I download any other file? I am really sick of this plugin but I need to understand... I know I am boring, I always say the same thing, but it's because I don't understand, it's so difficult..if it is just coding I learn pretty fast, but these things are new to me

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            thecodemonkey
            wrote on last edited by thecodemonkey
            #59

            @cpplegend you can use different C++ compilers with Qt. On Windows by default these are Microsoft Visual C++ or MinGW. During Installation in Qt maintenance tool you choose if you install the Qt version for MSVC or for MinGW (or both):

            fa1e2c03-d495-45ea-85bd-8831ed0c71cc-image.png .

            If you are a beginner, I recommend to install only one of them to avoid confusion. In Qt Creator under "Projects" you should be able to see, which Qt version is used for the current project:

            272e89bf-4d81-40f4-bc68-118e2dbb7dbf-image.png

            depending on that, you need to copy the correct qsqlmysql.dll (plus libmysql.dll):

            If it's MSVC2019 then for example copy the files from https://github.com/thecodemonkey86/qt_mysql_driver/files/11768056/qsqlmysql.dll_Qt_SQL_driver_6.5.1_MSVC2019_64-bit.zip,

            if MinGW then the files from https://github.com/thecodemonkey86/qt_mysql_driver/files/11768059/qsqlmysql.dll_Qt_SQL_driver_6.5.1_MinGW_11.2.0_64-bit.zip

            to sqldrivers folder and application folder respectively

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            • T thecodemonkey

              @cpplegend you can use different C++ compilers with Qt. On Windows by default these are Microsoft Visual C++ or MinGW. During Installation in Qt maintenance tool you choose if you install the Qt version for MSVC or for MinGW (or both):

              fa1e2c03-d495-45ea-85bd-8831ed0c71cc-image.png .

              If you are a beginner, I recommend to install only one of them to avoid confusion. In Qt Creator under "Projects" you should be able to see, which Qt version is used for the current project:

              272e89bf-4d81-40f4-bc68-118e2dbb7dbf-image.png

              depending on that, you need to copy the correct qsqlmysql.dll (plus libmysql.dll):

              If it's MSVC2019 then for example copy the files from https://github.com/thecodemonkey86/qt_mysql_driver/files/11768056/qsqlmysql.dll_Qt_SQL_driver_6.5.1_MSVC2019_64-bit.zip,

              if MinGW then the files from https://github.com/thecodemonkey86/qt_mysql_driver/files/11768059/qsqlmysql.dll_Qt_SQL_driver_6.5.1_MinGW_11.2.0_64-bit.zip

              to sqldrivers folder and application folder respectively

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              cpplegend
              wrote on last edited by
              #60

              @thecodemonkey sqldrivers from plugin folder in src from qtbase folder, right? and then as you Said the Application folder of the Project I am creating, is it right?

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              • C cpplegend

                @thecodemonkey sqldrivers from plugin folder in src from qtbase folder, right? and then as you Said the Application folder of the Project I am creating, is it right?

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                thecodemonkey
                wrote on last edited by thecodemonkey
                #61

                @cpplegend by application folder I mean the folder, where the compiler creates the .exe file of your project, like this:
                bbc12c36-2a8b-4199-b343-75d54956cb65-image.png

                the sqldrivers folder can be either a subdirectory of the application folder (like this:
                69b60ef9-894c-4a95-9862-b89b20a7c2c1-image.png

                ) ,or in the installation binary folder of Qt. On my system that would be for
                MSVC: C:\Qt\6.5.1\msvc2019_64\plugins\sqldrivers (and for MinGW: C:\Qt\6.5.1\mingw_64\plugins\sqldrivers)

                both options (application folder and installation folder) should work

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                • T thecodemonkey

                  @cpplegend by application folder I mean the folder, where the compiler creates the .exe file of your project, like this:
                  bbc12c36-2a8b-4199-b343-75d54956cb65-image.png

                  the sqldrivers folder can be either a subdirectory of the application folder (like this:
                  69b60ef9-894c-4a95-9862-b89b20a7c2c1-image.png

                  ) ,or in the installation binary folder of Qt. On my system that would be for
                  MSVC: C:\Qt\6.5.1\msvc2019_64\plugins\sqldrivers (and for MinGW: C:\Qt\6.5.1\mingw_64\plugins\sqldrivers)

                  both options (application folder and installation folder) should work

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                  cpplegend
                  wrote on last edited by
                  #62

                  @thecodemonkey ok when I return home I will try

                  1 Reply Last reply
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                  • T thecodemonkey

                    @cpplegend by application folder I mean the folder, where the compiler creates the .exe file of your project, like this:
                    bbc12c36-2a8b-4199-b343-75d54956cb65-image.png

                    the sqldrivers folder can be either a subdirectory of the application folder (like this:
                    69b60ef9-894c-4a95-9862-b89b20a7c2c1-image.png

                    ) ,or in the installation binary folder of Qt. On my system that would be for
                    MSVC: C:\Qt\6.5.1\msvc2019_64\plugins\sqldrivers (and for MinGW: C:\Qt\6.5.1\mingw_64\plugins\sqldrivers)

                    both options (application folder and installation folder) should work

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                    cpplegend
                    wrote on last edited by
                    #63

                    @thecodemonkey now when I include the QSqlDatabase header file these errors occures: :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x3b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x8b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                    :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0xef): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x14f): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                    :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1a9): undefined reference to __imp__ZN12QSqlDatabaseC1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1ee): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                    :-1: error: collect2.exe: error: ld returned 1 exit status
                    :-1: error: ninja: build stopped: subcommand failed.

                    T JonBJ 2 Replies Last reply
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                    • C cpplegend

                      @thecodemonkey now when I include the QSqlDatabase header file these errors occures: :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x3b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x8b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                      :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0xef): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x14f): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                      :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1a9): undefined reference to __imp__ZN12QSqlDatabaseC1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1ee): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                      :-1: error: collect2.exe: error: ld returned 1 exit status
                      :-1: error: ninja: build stopped: subcommand failed.

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                      thecodemonkey
                      wrote on last edited by
                      #64

                      @cpplegend Did you link the Sql module in CMakeLists ?

                      C 1 Reply Last reply
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                      • C cpplegend

                        @thecodemonkey now when I include the QSqlDatabase header file these errors occures: :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x3b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x8b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                        :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0xef): undefined reference to __imp__ZN12QSqlDatabaseD1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x14f): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                        :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1a9): undefined reference to __imp__ZN12QSqlDatabaseC1Ev' :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x1ee): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'
                        :-1: error: collect2.exe: error: ld returned 1 exit status
                        :-1: error: ninja: build stopped: subcommand failed.

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #65

                        @cpplegend
                        If I am not mistaken:

                        :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x3b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'

                        widget.cpp.obj indicates this has been compiled with MSVC (MSVC does .obj files, MinGW does .o) and __imp__ZN12QSqlDatabaseD1Ev leading __imp_ also indicates MSVC rather than MinGW. [Also if you really have a file named widget.cpp.obj somewhere per the error message that is wrong, MSVC should be generating widget.obj from widget.cpp, but that's another matter.]

                        :-1: error: collect2.exe: error: ld returned 1 exit status

                        collect2/ld indicates MinGW linker.

                        (Assuming I am right) You really need to sort out whether you are using MSVC or MinGW once and for all, and make it consistent....

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                        • JonBJ JonB

                          @cpplegend
                          If I am not mistaken:

                          :-1: error: CMakeFiles/untitled1.dir/widget.cpp.obj:widget.cpp:(.text+0x3b): undefined reference to __imp__ZN12QSqlDatabaseD1Ev'

                          widget.cpp.obj indicates this has been compiled with MSVC (MSVC does .obj files, MinGW does .o) and __imp__ZN12QSqlDatabaseD1Ev leading __imp_ also indicates MSVC rather than MinGW. [Also if you really have a file named widget.cpp.obj somewhere per the error message that is wrong, MSVC should be generating widget.obj from widget.cpp, but that's another matter.]

                          :-1: error: collect2.exe: error: ld returned 1 exit status

                          collect2/ld indicates MinGW linker.

                          (Assuming I am right) You really need to sort out whether you are using MSVC or MinGW once and for all, and make it consistent....

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                          cpplegend
                          wrote on last edited by
                          #66

                          @JonB I am using mingw, I know that because its the only package I have installed between mingw and msvc

                          JonBJ 1 Reply Last reply
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                          • C cpplegend

                            @JonB I am using mingw, I know that because its the only package I have installed between mingw and msvc

                            JonBJ Offline
                            JonBJ Offline
                            JonB
                            wrote on last edited by
                            #67

                            @cpplegend Then what about as @thecodemonkey said?

                            1 Reply Last reply
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                            • T thecodemonkey

                              @cpplegend Did you link the Sql module in CMakeLists ?

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                              cpplegend
                              wrote on last edited by cpplegend
                              #68

                              @thecodemonkey @JonB how do I make it?

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                              • C cpplegend

                                @thecodemonkey @JonB how do I make it?

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                                thecodemonkey
                                wrote on last edited by
                                #69

                                @cpplegend maybe it gets us further if you post your project here first, incl CMakeLists.txt

                                1 Reply Last reply
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