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  4. I had complied qsqlmysql.dll.
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I had complied qsqlmysql.dll.

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  • yuyuY Offline
    yuyuY Offline
    yuyu
    wrote on last edited by
    #6

    I had success when I use mysql5.7,but the same way it is error when I use mysql8

    jsulmJ 1 Reply Last reply
    0
    • yuyuY yuyu

      I had success when I use mysql5.7,but the same way it is error when I use mysql8

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #7

      @yuyu As @Christian-Ehrlicher suggested set QT_DEBUG_PLUGINS environment variable to 1 before running your app and then check its out put - it should tell you why qsqlmysql.dll could not be loaded.

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      yuyuY 2 Replies Last reply
      0
      • jsulmJ jsulm

        @yuyu As @Christian-Ehrlicher suggested set QT_DEBUG_PLUGINS environment variable to 1 before running your app and then check its out put - it should tell you why qsqlmysql.dll could not be loaded.

        yuyuY Offline
        yuyuY Offline
        yuyu
        wrote on last edited by
        #8

        @jsulm I Had set but it tell me load error.I look up the qt doc.
        75f60e43-53c7-46d7-bfaf-4cd7e73678bc-image.png
        I do not know what is mean the note.

        1 Reply Last reply
        0
        • jsulmJ jsulm

          @yuyu As @Christian-Ehrlicher suggested set QT_DEBUG_PLUGINS environment variable to 1 before running your app and then check its out put - it should tell you why qsqlmysql.dll could not be loaded.

          yuyuY Offline
          yuyuY Offline
          yuyu
          wrote on last edited by yuyu
          #9

          @jsulm said in I had complied qsqlmysql.dll.:

          QT_DEBUG_PLUGINS
          8904559d-35ac-49a3-94c1-98c7d5f89ee2-image.png
          a146f299-8ca0-4c07-983d-8b6d1c41a0ed-image.png

          jsulmJ 1 Reply Last reply
          0
          • yuyuY yuyu

            @jsulm said in I had complied qsqlmysql.dll.:

            QT_DEBUG_PLUGINS
            8904559d-35ac-49a3-94c1-98c7d5f89ee2-image.png
            a146f299-8ca0-4c07-983d-8b6d1c41a0ed-image.png

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #10

            @yuyu Please post text not images.
            We need to see the actual error after :
            Currently there are unreadable characters.

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            yuyuY 1 Reply Last reply
            0
            • jsulmJ jsulm

              @yuyu Please post text not images.
              We need to see the actual error after :
              Currently there are unreadable characters.

              yuyuY Offline
              yuyuY Offline
              yuyu
              wrote on last edited by
              #11

              @jsulm

              qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QSQLITE")
              qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll"
              qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
              {
                  "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                  "MetaData": {
                      "Keys": [
                          "QMYSQL",
                          "QMARIADB"
                      ]
                  },
                  "archlevel": 2,
                  "className": "QMYSQLDriverPlugin",
                  "debug": true,
                  "version": 393984
              }
              
              qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\\Qt\\6.3.0\\mingw_64\\plugins\\sqldrivers\\qsqlmysql.dll
              

              I had success when i use mysql5.7 ,but the same way there has error when i use mysql8.0.22

              jsulmJ 1 Reply Last reply
              0
              • yuyuY yuyu

                @jsulm

                qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QSQLITE")
                qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll"
                qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
                {
                    "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                    "MetaData": {
                        "Keys": [
                            "QMYSQL",
                            "QMARIADB"
                        ]
                    },
                    "archlevel": 2,
                    "className": "QMYSQLDriverPlugin",
                    "debug": true,
                    "version": 393984
                }
                
                qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\\Qt\\6.3.0\\mingw_64\\plugins\\sqldrivers\\qsqlmysql.dll
                

                I had success when i use mysql5.7 ,but the same way there has error when i use mysql8.0.22

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #12

                @yuyu said in I had complied qsqlmysql.dll.:

                qsqlmysql.dll

                In your other output there is some unreadable characters after qsqlmysql.dll:
                Can you provide that part as readable text?

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                yuyuY 1 Reply Last reply
                0
                • jsulmJ jsulm

                  @yuyu said in I had complied qsqlmysql.dll.:

                  qsqlmysql.dll

                  In your other output there is some unreadable characters after qsqlmysql.dll:
                  Can you provide that part as readable text?

                  yuyuY Offline
                  yuyuY Offline
                  yuyu
                  wrote on last edited by yuyu
                  #13

                  @jsulm the unreadable characters is what I use qDebug output chineses,I had delete it.
                  now
                  mycode

                   qDebug() << QSqlDatabase::drivers();
                  
                      QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
                      db.setHostName("localhost");
                      db.setPort(3306);
                      db.setDatabaseName("mydb");
                      db.setUserName("root");
                      db.setPassword("123456");
                      bool ok = db.open();
                  

                  the console

                  
                  16:45:13: Debugging D:\1a_perfect\build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug\debug\testsql.exe ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/platforms" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qdirect2d.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qdirect2d.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                      "MetaData": {
                          "Keys": [
                              "direct2d"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QWindowsDirect2DIntegrationPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("direct2d")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qminimal.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qminimal.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                      "MetaData": {
                          "Keys": [
                              "minimal"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QMinimalIntegrationPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qoffscreen.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qoffscreen.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                      "MetaData": {
                          "Keys": [
                              "offscreen"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QOffscreenIntegrationPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                      "MetaData": {
                          "Keys": [
                              "windows"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QWindowsIntegrationPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/platforms" ...
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/platformthemes" ...
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/platformthemes" ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/styles" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QStyleFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "windowsvista"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QWindowsVistaStylePlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista")
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/styles" ...
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/iconengines" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/iconengines/qsvgicon.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/iconengines/qsvgicon.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "svg",
                              "svgz",
                              "svg.gz"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QSvgIconPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz", "svg.gz")
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/iconengines" ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/imageformats" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "gif"
                          ],
                          "MimeTypes": [
                              "image/gif"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QGifPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gif")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "ico",
                              "cur"
                          ],
                          "MimeTypes": [
                              "image/vnd.microsoft.icon",
                              "image/vnd.microsoft.icon"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QICOPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ico", "cur")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "jpg",
                              "jpeg"
                          ],
                          "MimeTypes": [
                              "image/jpeg",
                              "image/jpeg"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QJpegPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("jpg", "jpeg")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "svg",
                              "svgz"
                          ],
                          "MimeTypes": [
                              "image/svg+xml",
                              "image/svg+xml-compressed"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QSvgPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz")
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/imageformats" ...
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll" loaded library
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll" loaded library
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll" loaded library
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers" ...
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlite.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlite.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "QSQLITE"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QSQLiteDriverPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QSQLITE")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "QMYSQL",
                              "QMARIADB"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QMYSQLDriverPlugin",
                      "debug": true,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QMYSQL", "QMARIADB")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlodbc.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "QODBC"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QODBCDriverPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QODBC")
                  qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlpsql.dll"
                  qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
                  {
                      "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                      "MetaData": {
                          "Keys": [
                              "QPSQL"
                          ]
                      },
                      "archlevel": 2,
                      "className": "QPSQLDriverPlugin",
                      "debug": false,
                      "version": 393984
                  }
                  
                  qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QPSQL")
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/sqldrivers" ...
                  QList("QSQLITE", "QMARIADB", "QMYSQL", "QODBC", "QPSQL")
                  qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" loaded library
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/accessible" ...
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/accessible" ...
                  qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/accessiblebridge" ...
                  qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/accessiblebridge" ...
                  
                  jsulmJ 1 Reply Last reply
                  0
                  • yuyuY yuyu

                    @jsulm the unreadable characters is what I use qDebug output chineses,I had delete it.
                    now
                    mycode

                     qDebug() << QSqlDatabase::drivers();
                    
                        QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
                        db.setHostName("localhost");
                        db.setPort(3306);
                        db.setDatabaseName("mydb");
                        db.setUserName("root");
                        db.setPassword("123456");
                        bool ok = db.open();
                    

                    the console

                    
                    16:45:13: Debugging D:\1a_perfect\build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug\debug\testsql.exe ...
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/platforms" ...
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qdirect2d.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qdirect2d.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                        "MetaData": {
                            "Keys": [
                                "direct2d"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QWindowsDirect2DIntegrationPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("direct2d")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qminimal.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qminimal.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                        "MetaData": {
                            "Keys": [
                                "minimal"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QMinimalIntegrationPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qoffscreen.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qoffscreen.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                        "MetaData": {
                            "Keys": [
                                "offscreen"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QOffscreenIntegrationPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
                        "MetaData": {
                            "Keys": [
                                "windows"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QWindowsIntegrationPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windows")
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/platforms" ...
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/platforms/qwindows.dll" loaded library
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/platformthemes" ...
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/platformthemes" ...
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/styles" ...
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QStyleFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "windowsvista"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QWindowsVistaStylePlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("windowsvista")
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/styles" ...
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/styles/qwindowsvistastyle.dll" loaded library
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/iconengines" ...
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/iconengines/qsvgicon.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/iconengines/qsvgicon.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QIconEngineFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "svg",
                                "svgz",
                                "svg.gz"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QSvgIconPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz", "svg.gz")
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/iconengines" ...
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/imageformats" ...
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "gif"
                            ],
                            "MimeTypes": [
                                "image/gif"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QGifPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gif")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "ico",
                                "cur"
                            ],
                            "MimeTypes": [
                                "image/vnd.microsoft.icon",
                                "image/vnd.microsoft.icon"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QICOPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ico", "cur")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "jpg",
                                "jpeg"
                            ],
                            "MimeTypes": [
                                "image/jpeg",
                                "image/jpeg"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QJpegPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("jpg", "jpeg")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "svg",
                                "svgz"
                            ],
                            "MimeTypes": [
                                "image/svg+xml",
                                "image/svg+xml-compressed"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QSvgPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz")
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/imageformats" ...
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qgif.dll" loaded library
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qico.dll" loaded library
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qjpeg.dll" loaded library
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/imageformats/qsvg.dll" loaded library
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers" ...
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlite.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlite.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "QSQLITE"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QSQLiteDriverPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QSQLITE")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "QMYSQL",
                                "QMARIADB"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QMYSQLDriverPlugin",
                        "debug": true,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QMYSQL", "QMARIADB")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlodbc.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlodbc.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "QODBC"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QODBCDriverPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QODBC")
                    qt.core.plugin.factoryloader: looking at "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlpsql.dll"
                    qt.core.plugin.loader: Found metadata in lib C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlpsql.dll, metadata=
                    {
                        "IID": "org.qt-project.Qt.QSqlDriverFactoryInterface",
                        "MetaData": {
                            "Keys": [
                                "QPSQL"
                            ]
                        },
                        "archlevel": 2,
                        "className": "QPSQLDriverPlugin",
                        "debug": false,
                        "version": 393984
                    }
                    
                    qt.core.plugin.factoryloader: Got keys from plugin meta data QList("QPSQL")
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/sqldrivers" ...
                    QList("QSQLITE", "QMARIADB", "QMYSQL", "QODBC", "QPSQL")
                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" loaded library
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/accessible" ...
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/accessible" ...
                    qt.core.plugin.factoryloader: checking directory path "C:/Qt/6.3.0/mingw_64/plugins/accessiblebridge" ...
                    qt.core.plugin.factoryloader: checking directory path "D:/1a_perfect/build-testsql-Desktop_Qt_6_3_0_MinGW_64_bit-Debug/debug/accessiblebridge" ...
                    
                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #14

                    @yuyu said in I had complied qsqlmysql.dll.:

                    qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" loaded library

                    Looks good now

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

                    yuyuY 1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @yuyu said in I had complied qsqlmysql.dll.:

                      qt.core.library: "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" loaded library

                      Looks good now

                      yuyuY Offline
                      yuyuY Offline
                      yuyu
                      wrote on last edited by
                      #15

                      @jsulm I can not connect my mysql database .

                      jsulmJ NevezN 2 Replies Last reply
                      0
                      • yuyuY yuyu

                        @jsulm I can not connect my mysql database .

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #16

                        @yuyu What does db.open() return?
                        What does https://doc.qt.io/qt-5/qsqldatabase.html#lastError return after open() call?

                        https://forum.qt.io/topic/113070/qt-code-of-conduct

                        yuyuY 1 Reply Last reply
                        0
                        • yuyuY yuyu

                          @jsulm I can not connect my mysql database .

                          NevezN Offline
                          NevezN Offline
                          Nevez
                          wrote on last edited by
                          #17

                          @yuyu Still getting driver not installed error? and yes share the result of db.open() as well.

                          1 Reply Last reply
                          0
                          • jsulmJ jsulm

                            @yuyu What does db.open() return?
                            What does https://doc.qt.io/qt-5/qsqldatabase.html#lastError return after open() call?

                            yuyuY Offline
                            yuyuY Offline
                            yuyu
                            wrote on last edited by
                            #18

                            @jsulm false

                            jsulmJ 1 Reply Last reply
                            0
                            • yuyuY yuyu

                              @jsulm false

                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #19

                              @yuyu I asked two questions. Would you be so kind to also answer the second one?

                              https://forum.qt.io/topic/113070/qt-code-of-conduct

                              yuyuY 1 Reply Last reply
                              0
                              • jsulmJ jsulm

                                @yuyu I asked two questions. Would you be so kind to also answer the second one?

                                yuyuY Offline
                                yuyuY Offline
                                yuyu
                                wrote on last edited by
                                #20

                                @Nevez yes,but I had install it. it return false.
                                sometime has
                                42e82386-47d7-4a05-91c6-2934dd95689d-image.png

                                qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\\Qt\\6.3.0\\mingw_64\\plugins\\sqldrivers\\qsqlmysql.dll:
                                
                                jsulmJ NevezN 2 Replies Last reply
                                0
                                • yuyuY yuyu

                                  @Nevez yes,but I had install it. it return false.
                                  sometime has
                                  42e82386-47d7-4a05-91c6-2934dd95689d-image.png

                                  qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\\Qt\\6.3.0\\mingw_64\\plugins\\sqldrivers\\qsqlmysql.dll:
                                  
                                  jsulmJ Offline
                                  jsulmJ Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #21

                                  @yuyu I'm confused: before you posted output showing that the plug-in was loaded.
                                  Now you posted output showing that it could not be loaded.

                                  Please do again what was suggested before: set QT_DEBUG_PLUGINS and if the plug-in fails to load post the output here...

                                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                                  yuyuY 1 Reply Last reply
                                  0
                                  • jsulmJ jsulm

                                    @yuyu I'm confused: before you posted output showing that the plug-in was loaded.
                                    Now you posted output showing that it could not be loaded.

                                    Please do again what was suggested before: set QT_DEBUG_PLUGINS and if the plug-in fails to load post the output here...

                                    yuyuY Offline
                                    yuyuY Offline
                                    yuyu
                                    wrote on last edited by
                                    #22

                                    @jsulm you can try it ,it may be a problem,you can use mysql 8.0.28 and qt6.3 , you can find this error.

                                    jsulmJ 1 Reply Last reply
                                    0
                                    • yuyuY yuyu

                                      @jsulm you can try it ,it may be a problem,you can use mysql 8.0.28 and qt6.3 , you can find this error.

                                      jsulmJ Offline
                                      jsulmJ Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #23

                                      @yuyu I'm not going to try anything.
                                      I suggested what you can do to get help.
                                      It is up to you to do that or not...

                                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                                      yuyuY 1 Reply Last reply
                                      0
                                      • jsulmJ jsulm

                                        @yuyu I'm not going to try anything.
                                        I suggested what you can do to get help.
                                        It is up to you to do that or not...

                                        yuyuY Offline
                                        yuyuY Offline
                                        yuyu
                                        wrote on last edited by
                                        #24

                                        @jsulm I think it's a waste of time, regardless of the problem

                                        1 Reply Last reply
                                        0
                                        • yuyuY yuyu

                                          @Nevez yes,but I had install it. it return false.
                                          sometime has
                                          42e82386-47d7-4a05-91c6-2934dd95689d-image.png

                                          qt.core.plugin.loader: QLibraryPrivate::loadPlugin failed on "C:/Qt/6.3.0/mingw_64/plugins/sqldrivers/qsqlmysql.dll" : "Cannot load library C:\\Qt\\6.3.0\\mingw_64\\plugins\\sqldrivers\\qsqlmysql.dll:
                                          
                                          NevezN Offline
                                          NevezN Offline
                                          Nevez
                                          wrote on last edited by
                                          #25

                                          @yuyu
                                          I am using Mysql 8.x.x and QT 6.2.3. Mysql works fine too.
                                          According to the error you get, you may have placed the relevant DLL in the wrong place or you may have used the wrong version DLL.
                                          There was a video on youtube that did this well. You will find it on your first search.

                                          yuyuY 1 Reply Last reply
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