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cannot Excecute query in sql

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  • JonBJ JonB

    @JonnyQB
    Start by printing out query.lastError() after executing statement, as @mrjj said. Almost anything could be the issue. You do not even say what message you get from your code, only "i just cant execute the query". There is also no message for Logindb.open() failing. We cannot guess.

    J Offline
    J Offline
    JonnyQB
    wrote on last edited by
    #6

    @JonB
    Error = "Driver not loaded Driver not loaded"
    now should i use another driver or what ?

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    0
    • J Offline
      J Offline
      JonnyQB
      wrote on last edited by
      #7

      @JonB
      both sqllite and mysql are not loaded

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      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #8

        Hi,

        Start your application with QT_DEBUG_PLUGINS environment variable set to 1 so see what happens when the plugins are loaded.

        You can set that variable in the Run part of the Project panel.

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        J JonBJ 2 Replies Last reply
        1
        • SGaistS SGaist

          Hi,

          Start your application with QT_DEBUG_PLUGINS environment variable set to 1 so see what happens when the plugins are loaded.

          You can set that variable in the Run part of the Project panel.

          J Offline
          J Offline
          JonnyQB
          wrote on last edited by
          #9

          @SGaist
          where should i set it it =1

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          0
          • SGaistS SGaist

            Hi,

            Start your application with QT_DEBUG_PLUGINS environment variable set to 1 so see what happens when the plugins are loaded.

            You can set that variable in the Run part of the Project panel.

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by
            #10

            @JonnyQB
            Did you see:

            @SGaist said in cannot Excecute query in sql:

            You can set that variable in the Run part of the Project panel.

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            • J Offline
              J Offline
              JonnyQB
              wrote on last edited by JonnyQB
              #11

              @JonB
              @SGaist
              like so ?
              it changes nothing
              Unbenannt4.PNG

              JonBJ 1 Reply Last reply
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              • J JonnyQB

                @JonB
                @SGaist
                like so ?
                it changes nothing
                Unbenannt4.PNG

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #12

                @JonnyQB
                Please take the time to read @SGaist's post; it's also in the Qt documentation. You have not spelled the environment variable as he typed, you have not used copy & paste, so what do you expect to happen if you do not get that correct?

                J 1 Reply Last reply
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                • JonBJ JonB

                  @JonnyQB
                  Please take the time to read @SGaist's post; it's also in the Qt documentation. You have not spelled the environment variable as he typed, you have not used copy & paste, so what do you expect to happen if you do not get that correct?

                  J Offline
                  J Offline
                  JonnyQB
                  wrote on last edited by
                  #13

                  @JonB
                  i took time to read and figure it out but i couldnt find it because i think my qt is german soi dont know where to chage it exactly

                  JonBJ 1 Reply Last reply
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                  • J JonnyQB

                    @JonB
                    i took time to read and figure it out but i couldnt find it because i think my qt is german soi dont know where to chage it exactly

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by JonB
                    #14

                    @JonnyQB
                    To be clear: you are changing in the right place (I think!), but the name must be QT_DEBUG_PLUGINS, OK?

                    J 1 Reply Last reply
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                    • JonBJ JonB

                      @JonnyQB
                      To be clear: you are changing in the right place (I think!), but the name must be QT_DEBUG_PLUGINS, OK?

                      J Offline
                      J Offline
                      JonnyQB
                      wrote on last edited by
                      #15

                      @JonB
                      i changed it and got Error = "Driver not loaded Driver not loaded" again

                      jsulmJ 1 Reply Last reply
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                      • J JonnyQB

                        @JonB
                        i changed it and got Error = "Driver not loaded Driver not loaded" again

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

                        @JonnyQB With QT_DEBUG_PLUGINS set you should now get some additional output from the application. You have to check that output to see why the plug-in was not loaded (you can also post it here).

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

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                        • J Offline
                          J Offline
                          JonnyQB
                          wrote on last edited by
                          #17

                          @JonB @jsulm

                          Unbenannt6.PNG

                          JonBJ 1 Reply Last reply
                          0
                          • J JonnyQB

                            @JonB @jsulm

                            Unbenannt6.PNG

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

                            @JonnyQB
                            We have said repeatedly what you need to set to get the debug output required in the replies above. Show us where you did what for that and we will look again....

                            1 Reply Last reply
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