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QSqlDatabase: QMYSQL driver not loaded

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  • A AlexFr

    @SGaist the errors I am getting

    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QPSQL")
    qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Debug/debug/sqldrivers" ...
    QSqlDatabase: QMYSQL driver not loaded
    QSqlDatabase: available drivers: QSQLITE QODBC QPSQL
    No Connection

    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/accessiblebridge" ...
    qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Debug/debug/accessiblebridge" ...

    any help would be greatly appreciated.

    JonBJ Online
    JonBJ Online
    JonB
    wrote on last edited by JonB
    #16

    @AlexFr said in QSqlDatabase: QMYSQL driver not loaded:

    QSqlDatabase: QMYSQL driver not loaded
    QSqlDatabase: available drivers: QSQLITE QODBC QPSQL

    Your output show no sign/mention of finding any QMYSQL plugin anywhere (where it is looking). So what file(s) do you have where for plugins with regard to QMYSQL? It looks like either there is nothing at all, so it cannot even try to load it, or there is some output earlier in the diagnostic relating to QMYSQL which you are not showing.

    A 1 Reply Last reply
    0
    • JonBJ JonB

      @AlexFr said in QSqlDatabase: QMYSQL driver not loaded:

      QSqlDatabase: QMYSQL driver not loaded
      QSqlDatabase: available drivers: QSQLITE QODBC QPSQL

      Your output show no sign/mention of finding any QMYSQL plugin anywhere (where it is looking). So what file(s) do you have where for plugins with regard to QMYSQL? It looks like either there is nothing at all, so it cannot even try to load it, or there is some output earlier in the diagnostic relating to QMYSQL which you are not showing.

      A Offline
      A Offline
      AlexFr
      wrote on last edited by
      #17

      @JonB in this folder "C:\Qt\6.4.0\mingw_64\plugins\sqldrivers", I have "qsqlmysql.dll" and "qsqlmysql.debug", amongst other files. I built the plugin using:
      "
      mkdir build-sqldrivers
      cd build-sqldrivers

      qt-cmake -G Ninja <qt_installation_path>\Src\qtbase\src\plugins\sqldrivers -DCMAKE_INSTALL_PREFIX=<qt_installation_path><platform> -DMySQL_INCLUDE_DIR="C:\mysql-8.0.22-winx64\include" -DMySQL_LIBRARY="C:\mysql-8.0.22-winx64\lib\libmysql.lib"
      cmake --build .
      cmake --install .
      "

      1 Reply Last reply
      0
      • hskoglundH hskoglund

        Hi, please be careful with your versions of Qt:

        1. you use Qt 5.15.2 for the debug build
          (C:/Users/Nelson/Documents/CP/build-DatabaseConn-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug/debug/)
        2. 'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/ as the place where Qt looks for the MySQL plugin
        3. C:\Qt\6.0.0\Src\qtbase\src\plugins\sqldrivers is where you build it from (and installing to C:\Qt\6.0.0\mingw81_64)

        Don't know if that's the cause of the problems but it will help to only use one version of Qt for everything :-)

        JonBJ Online
        JonBJ Online
        JonB
        wrote on last edited by
        #18

        @hskoglund said in QSqlDatabase: QMYSQL driver not loaded:

        'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/ as the place where Qt looks for the MySQL plugin
        C:\Qt\6.0.0\Src\qtbase\src\plugins\sqldrivers is where you build it from (and installing to C:\Qt\6.0.0\mingw81_64)

        @AlexFr said in QSqlDatabase: QMYSQL driver not loaded:

        @JonB in this folder "C:\Qt\6.4.0\mingw_64\plugins\sqldrivers", I have "qsqlmysql.dll" and "qsqlmysql.debug"

        Seems to me you have a mix-up/mismatch betwenn these paths, not to mention whether you are using MinGW versus MSVC. Sort out what you are using from where, for sure. That is all I know.

        A 1 Reply Last reply
        0
        • JonBJ JonB

          @hskoglund said in QSqlDatabase: QMYSQL driver not loaded:

          'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/ as the place where Qt looks for the MySQL plugin
          C:\Qt\6.0.0\Src\qtbase\src\plugins\sqldrivers is where you build it from (and installing to C:\Qt\6.0.0\mingw81_64)

          @AlexFr said in QSqlDatabase: QMYSQL driver not loaded:

          @JonB in this folder "C:\Qt\6.4.0\mingw_64\plugins\sqldrivers", I have "qsqlmysql.dll" and "qsqlmysql.debug"

          Seems to me you have a mix-up/mismatch betwenn these paths, not to mention whether you are using MinGW versus MSVC. Sort out what you are using from where, for sure. That is all I know.

          A Offline
          A Offline
          AlexFr
          wrote on last edited by
          #19

          @JonB thanks for the reply. I also have I have "qsqlmysql.dll" and "qsqlmysql.debug" in "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/" and it still does not work.

          JonBJ 1 Reply Last reply
          0
          • A AlexFr

            @JonB thanks for the reply. I also have I have "qsqlmysql.dll" and "qsqlmysql.debug" in "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/" and it still does not work.

            JonBJ Online
            JonBJ Online
            JonB
            wrote on last edited by
            #20

            @AlexFr
            It's no good just having the files in that directory, you have to have the application looking in that directory to find it/them. I do not not know whether that is happening in your situation.

            A 1 Reply Last reply
            0
            • JonBJ JonB

              @AlexFr
              It's no good just having the files in that directory, you have to have the application looking in that directory to find it/them. I do not not know whether that is happening in your situation.

              A Offline
              A Offline
              AlexFr
              wrote on last edited by
              #21

              @JonB thanks for the reply.
              this is part of the error message:
              "
              qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/accessiblebridge"
              "

              1 Reply Last reply
              0
              • hskoglundH Offline
                hskoglundH Offline
                hskoglund
                wrote on last edited by
                #22

                Hi, you can try building your app in Release mode (not Debug), perhaps the release mode version of the QMySQL plugin you built will be picked up better than the debug version.
                Also please include all of the output from QT_DEBUG_PLUGINS, not just a single line...

                A 1 Reply Last reply
                0
                • hskoglundH hskoglund

                  Hi, you can try building your app in Release mode (not Debug), perhaps the release mode version of the QMySQL plugin you built will be picked up better than the debug version.
                  Also please include all of the output from QT_DEBUG_PLUGINS, not just a single line...

                  A Offline
                  A Offline
                  AlexFr
                  wrote on last edited by
                  #23

                  @hskoglund Hi. Thanks for the answer. I tried that, still I get the same errors. I can post the errors of course.

                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/platforms" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qdirect2d.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qdirect2d.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "direct2d"
                  ]
                  },
                  "archlevel": 1,
                  "className": "QWindowsDirect2DIntegrationPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("direct2d")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qdirect2dd.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qdirect2dd.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "direct2d"
                  ]
                  },
                  "archlevel": 1,
                  "className": "QWindowsDirect2DIntegrationPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qdirect2dd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qminimal.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qminimal.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "minimal"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QMinimalIntegrationPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qminimald.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qminimald.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "minimal"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QMinimalIntegrationPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qminimald.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qoffscreen.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qoffscreen.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "offscreen"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QOffscreenIntegrationPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qoffscreend.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qoffscreend.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "offscreen"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QOffscreenIntegrationPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qoffscreend.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindows.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindows.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "windows"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QWindowsIntegrationPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindowsd.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindowsd.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                  "MetaData": {
                  "Keys": [
                  "windows"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QWindowsIntegrationPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindowsd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release/release/platforms" ...
                  qt.core.library: "C:/Qt/6.4.0/msvc2019_64/plugins/platforms/qwindows.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/platformthemes" ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release/release/platformthemes" ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/styles" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QStyleFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "windowsvista"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QWindowsVistaStylePlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QStyleFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "windowsvista"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QWindowsVistaStylePlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyled.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release/release/styles" ...
                  qt.core.library: "C:/Qt/6.4.0/msvc2019_64/plugins/styles/qwindowsvistastyle.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlite.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlite.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QSQLITE"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QSQLiteDriverPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QSQLITE")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlited.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlited.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QSQLITE"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QSQLiteDriverPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlited.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlmysql.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QMYSQL",
                  "QMARIADB"
                  ]
                  },
                  "archlevel": 2,
                  "className": "QMYSQLDriverPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QMYSQL", "QMARIADB")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlodbc.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QODBC"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QODBCDriverPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QODBC")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlodbcd.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlodbcd.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QODBC"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QODBCDriverPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlodbcd.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlpsql.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QPSQL"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QPSQLDriverPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QPSQL")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlpsqld.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlpsqld.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QPSQL"
                  ]
                  },
                  "archlevel": 0,
                  "className": "QPSQLDriverPlugin",
                  "debug": true,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: "The plugin 'C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlpsqld.dll' uses incompatible Qt library. (Cannot mix debug and release libraries.)"
                  not a plugin
                  qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release/release/sqldrivers" ...
                  qt.core.library: "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlmysql.dll" cannot load: Cannot load library C:\Qt\6.4.0\msvc2019_64\plugins\sqldrivers\qsqlmysql.dll: Das angegebene Modul wurde nicht gefunden.
                  qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.4.0/msvc2019_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\Qt\6.4.0\msvc2019_64\plugins\sqldrivers\qsqlmysql.dll: Das angegebene Modul wurde nicht gefunden."
                  QSqlDatabase: QMYSQL driver not loaded
                  QSqlDatabase: available drivers: QSQLITE QMARIADB QMYSQL QODBC QPSQL
                  No Connection
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.4.0/msvc2019_64/plugins/accessiblebridge" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.4.0/msvc2019_64/plugins/accessiblebridge/qsqlmysql.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.4.0/msvc2019_64/plugins/accessiblebridge/qsqlmysql.dll, metadata=
                  {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                  "Keys": [
                  "QMYSQL",
                  "QMARIADB"
                  ]
                  },
                  "archlevel": 2,
                  "className": "QMYSQLDriverPlugin",
                  "debug": false,
                  "version": 394240
                  }

                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList()
                  qt.core.plugin.factoryloader: checking directory path "C:/Users/user/Documents/CP/build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release/release/accessiblebridge" ...

                  1 Reply Last reply
                  0
                  • hskoglundH Offline
                    hskoglundH Offline
                    hskoglund
                    wrote on last edited by hskoglund
                    #24

                    Hi, the output looks good, only one more step should remain, you need to copy the mysql driver dll to the same folder as where your app .exe file is.

                    The driver dll file is called libmysql.dll and it should be in the C:\Program Files\MySQL\MySQL Server 8.0\lib (provided that you've installed the 64-bit MySQL Installer 8.0.22)
                    So if I'm guessing correctly then the copy command is:
                    copy "C:\Program Files\MySQL\MySQL Server 8.0\lib\libmysql.dll" C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release

                    If you cannot find it (or haven't installed the MyQSL Installer) then there are plenty of alternatives for downloading that libmysql.dll file, for example here

                    A 1 Reply Last reply
                    0
                    • hskoglundH hskoglund

                      Hi, the output looks good, only one more step should remain, you need to copy the mysql driver dll to the same folder as where your app .exe file is.

                      The driver dll file is called libmysql.dll and it should be in the C:\Program Files\MySQL\MySQL Server 8.0\lib (provided that you've installed the 64-bit MySQL Installer 8.0.22)
                      So if I'm guessing correctly then the copy command is:
                      copy "C:\Program Files\MySQL\MySQL Server 8.0\lib\libmysql.dll" C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release

                      If you cannot find it (or haven't installed the MyQSL Installer) then there are plenty of alternatives for downloading that libmysql.dll file, for example here

                      A Offline
                      A Offline
                      AlexFr
                      wrote on last edited by
                      #25

                      @hskoglund Hi. thanks for the answer. it however did not help. I still get the exact same error as above.

                      1 Reply Last reply
                      0
                      • hskoglundH Offline
                        hskoglundH Offline
                        hskoglund
                        wrote on last edited by hskoglund
                        #26

                        Hi, even though you successfully copied libmysql.dll to where your .exe file is, perhaps it still fails because the .dlls that libmysql.dll depend on are not in your path. The files are libssl-1_1-x64.dll and libcrypto-1_1-x64.dll.

                        They also need to be copied to the same directory where your .exe file is, try (note: I'm guessing where they are on your PC):
                        copy C:\mysql-8.0.22-winx64\lib\libssl-1_1-x64.dll C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release
                        and
                        copy C:\mysql-8.0.22-winx64\lib\libcrypto-1_1-x64.dll C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release

                        P.S. If it still fails, could you post a directory listing of the files in the directory where your .exe file is, I'm guessing it is: C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release?

                        Edit: googled a bit more, there's an easier way to fix those 2 missing .dlls: install the MySQL Community Downloads MySQL Installer for Windows It's free but it requires an Oracle login :-( but perhaps you already have one)

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                        • hskoglundH hskoglund

                          Hi, even though you successfully copied libmysql.dll to where your .exe file is, perhaps it still fails because the .dlls that libmysql.dll depend on are not in your path. The files are libssl-1_1-x64.dll and libcrypto-1_1-x64.dll.

                          They also need to be copied to the same directory where your .exe file is, try (note: I'm guessing where they are on your PC):
                          copy C:\mysql-8.0.22-winx64\lib\libssl-1_1-x64.dll C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release
                          and
                          copy C:\mysql-8.0.22-winx64\lib\libcrypto-1_1-x64.dll C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release

                          P.S. If it still fails, could you post a directory listing of the files in the directory where your .exe file is, I'm guessing it is: C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release?

                          Edit: googled a bit more, there's an easier way to fix those 2 missing .dlls: install the MySQL Community Downloads MySQL Installer for Windows It's free but it requires an Oracle login :-( but perhaps you already have one)

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                          A Offline
                          AlexFr
                          wrote on last edited by
                          #27

                          @hskoglund Hey thank you for taking the time to help me fix this.
                          I tried what you said, and it still does not work. I already have mysql installed, but I can uninstall and install it again.

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                          • hskoglundH Offline
                            hskoglundH Offline
                            hskoglund
                            wrote on last edited by
                            #28

                            Hi, could you post a directory listing where your .exe file is so that the file dates and sizes are visibile.(perhaps there is a mismatch between the Release and Debug versions of the 3 MySQL files).

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                            • hskoglundH hskoglund

                              Hi, could you post a directory listing where your .exe file is so that the file dates and sizes are visibile.(perhaps there is a mismatch between the Release and Debug versions of the 3 MySQL files).

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                              AlexFr
                              wrote on last edited by
                              #29

                              @hskoglund Hey. Here is the directory listing:

                              DatabaseConnection.exe
                              FolderList.txt
                              libcrypto-1_1-x64.dll
                              libmysql.dll
                              libssl-1_1-x64.dll
                              main.obj
                              mainwindow.obj
                              moc_mainwindow.cpp
                              moc_mainwindow.obj
                              moc_predefs.h

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                              • hskoglundH Offline
                                hskoglundH Offline
                                hskoglund
                                wrote on last edited by
                                #30

                                Hi, looks good, but to check you've got the right versions, please also provide:
                                the path of the folder, for example C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release
                                the times and dates of all the files in the folder
                                the sizes in bytes of all the files in the folder

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                                • hskoglundH hskoglund

                                  Hi, looks good, but to check you've got the right versions, please also provide:
                                  the path of the folder, for example C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_4_0_MSVC2019_64bit-Release\release
                                  the times and dates of all the files in the folder
                                  the sizes in bytes of all the files in the folder

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                                  A Offline
                                  AlexFr
                                  wrote on last edited by
                                  #31

                                  @hskoglund Hey I am sorry for replying so late. Here goes:

                                  DatabaseConnection.exe 18.06.2022 18:22 28 KB
                                  libcrypto-1_1-x64.dll 16.03.2022 09:45 2.803 KB
                                  libmysql.dll 16.06.2020 20:53 6.647 KB
                                  libssl-1_1-x64.dll 16.03.2022 09:45 671 KB
                                  main.obj 18.06.2022 18:22 7KB
                                  mainwindow.obj 18.06.2022 18:22 29 KB
                                  moc_mainwindow.cpp 18.06.2022 18:22 3 KB
                                  moc_mainwindow.obj 18.06.2022 18:22 4 KB
                                  moc_predefs.h 18.06.2022 18:22 1KB

                                  The path to the files is exactly what is in your comment.
                                  I look forward to your reaction.
                                  thanks in advance.

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                                  • hskoglundH Offline
                                    hskoglundH Offline
                                    hskoglund
                                    wrote on last edited by
                                    #32

                                    Hi, libmysql.dll is not from the same year as libcrypto-1_1-x64.dll and ibssl-1_1-x64.dll, that could be a problem. I don't think that's the reason for the error though.

                                    I think you need to use a version of Qt that is not a beta release but a "real" release. That means installing the Qt 6.3.1 MSVC 2019 64-bit version. Then rebuild your app with that version of Qt.

                                    To avoid rebuilding the MySQL plugin for Qt version 6.3.1 you can download it from here

                                    When you open the zip, place the3 files libcrypto-1_1-x64.dll, libmysql.dll and libssl-1_1-x64.dll in the same folder as your .exe file (I'm guessing C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_3_1_MSVC2019_64bit-Release\release)
                                    then open the subdirectory sqldrivers in the .zip file and copy the 2 files qsqlmysql.dll and qsqlmysqld.dll to the plugins folder of your newly installed Qt version 6.3.1, I'm guessing: C:\Qt\6.3.1\msvc2019_64\plugins\sqldrivers

                                    A 1 Reply Last reply
                                    1
                                    • hskoglundH hskoglund

                                      Hi, libmysql.dll is not from the same year as libcrypto-1_1-x64.dll and ibssl-1_1-x64.dll, that could be a problem. I don't think that's the reason for the error though.

                                      I think you need to use a version of Qt that is not a beta release but a "real" release. That means installing the Qt 6.3.1 MSVC 2019 64-bit version. Then rebuild your app with that version of Qt.

                                      To avoid rebuilding the MySQL plugin for Qt version 6.3.1 you can download it from here

                                      When you open the zip, place the3 files libcrypto-1_1-x64.dll, libmysql.dll and libssl-1_1-x64.dll in the same folder as your .exe file (I'm guessing C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_3_1_MSVC2019_64bit-Release\release)
                                      then open the subdirectory sqldrivers in the .zip file and copy the 2 files qsqlmysql.dll and qsqlmysqld.dll to the plugins folder of your newly installed Qt version 6.3.1, I'm guessing: C:\Qt\6.3.1\msvc2019_64\plugins\sqldrivers

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                                      AlexFr
                                      wrote on last edited by
                                      #33

                                      @hskoglund said in QSqlDatabase: QMYSQL driver not loaded:

                                      Hi, libmysql.dll is not from the same year as libcrypto-1_1-x64.dll and ibssl-1_1-x64.dll, that could be a problem. I don't think that's the reason for the error though.

                                      I think you need to use a version of Qt that is not a beta release but a "real" release. That means installing the Qt 6.3.1 MSVC 2019 64-bit version. Then rebuild your app with that version of Qt.

                                      To avoid rebuilding the MySQL plugin for Qt version 6.3.1 you can download it from here

                                      When you open the zip, place the3 files libcrypto-1_1-x64.dll, libmysql.dll and libssl-1_1-x64.dll in the same folder as your .exe file (I'm guessing C:\Users\user\Documents\CP\build-DatabaseConnection-Desktop_Qt_6_3_1_MSVC2019_64bit-Release\release)
                                      then open the subdirectory sqldrivers in the .zip file and copy the 2 files qsqlmysql.dll and qsqlmysqld.dll to the plugins folder of your newly installed Qt version 6.3.1, I'm guessing: C:\Qt\6.3.1\msvc2019_64\plugins\sqldrivers

                                      It worked. Thanks a lot @hskoglund . To anyone struggling with the same issue, the quoted steps are precisely what you should follow to solve your problem.

                                      Thanks a million @hskoglund you are so kind.

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