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  4. QSqlTableModel insertRecord() returns true but nothing is saved in database
Forum Update on Monday, May 27th 2025

QSqlTableModel insertRecord() returns true but nothing is saved in database

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  • S Offline
    S Offline
    snow45
    wrote on last edited by
    #5

    Fixed the memory leak, but didn't make a difference. QSqlRecord comes from:

    @
    bool MyStuffDb::addStuff(const MyObject& myobject)
    {
    QSqlTableModel table(NULL, myDatabase);
    table.setTable("myobjects");
    QSqlRecord record = myDatabase.record("myobjects");

    // Call to code in first post
    return addStuff(myobject, &record, &table);
    

    }
    @

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #6

      Did you check what edit strategy is used for the model ? If it's OnManualSubmit then you have to submit your changes

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

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      • S Offline
        S Offline
        snow45
        wrote on last edited by
        #7

        I've checked that and tried them all without success. After calling insertRecord() I can see the row was inserted in memory but just not saved to disk, ever. Is there anyway to flush it to disk?

        I even switched over to QSqlQuery instead of using QSqlRecord and QSqlTableModel and had the same result. Could this be a linux issue somehow? As I mentioned before I only see this behavior on the first boot off a drive. Works like a charm after that.

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

          And if you remove the QSQLITE_ENABLE_SHARED_CACHE option ?

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

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          • S Offline
            S Offline
            snow45
            wrote on last edited by
            #9

            Problem exists with or without that option.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #10

              Can you create a minimal compilable example that shows this behavior ?

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

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              • S Offline
                S Offline
                snow45
                wrote on last edited by
                #11

                I will try and put one together. Been super busy with other things that need done asap.

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                • S Offline
                  S Offline
                  snow45
                  wrote on last edited by
                  #12

                  What's the best way to post this? Can't add attachments and it's a lot of code to post in a reply.

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    You can use e.g. "pastebin":http://pastebin.com

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

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                    • S Offline
                      S Offline
                      snow45
                      wrote on last edited by
                      #14

                      In that case check "here":https://gist.github.com/snow45/61cea39423b79c61e10f

                      Remember I only see this behavior with the setup initially described.

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                      • S Offline
                        S Offline
                        snow45
                        wrote on last edited by
                        #15

                        I found the problem. I used the command lsattr to look at file attributes on my database files and found that when I opened App 2 for the first time I was deleting the shared database out from under App 1 and recreating it. Just had to fix that and everything works like I would expect.

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #16

                          Out of curiosity, how was it doing it ?

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

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