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SQLITE Database in Project

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  • L Offline
    L Offline
    leon.anavi
    wrote on 17 May 2011, 12:37 last edited by
    #16

    [quote author="vsh.vshnu" date="1305635099"]Hi Volker,
    Its simply
    QString dbName="test.sqlite";

    Iam developing for meego in windows developement enviorment using Qt creator[/quote]

    Try to use the absolute path. You can get the file path of the application executable using "QCoreApplication::applicationFilePath":http://doc.qt.nokia.com/latest/qcoreapplication.html#applicationFilePath

    Cheers,
    Leon

    http://anavi.org/

    1 Reply Last reply
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    • V Offline
      V Offline
      vsh.vshnu
      wrote on 17 May 2011, 12:51 last edited by
      #17

      [quote author="leon.anavi" date="1305635864"]
      [quote author="vsh.vshnu" date="1305635099"]Hi Volker,
      Its simply
      QString dbName="test.sqlite";

      Iam developing for meego in windows developement enviorment using Qt creator[/quote]

      Try to use the absolute path. You can get the file path of the application executable using "QCoreApplication::applicationFilePath":http://doc.qt.nokia.com/latest/qcoreapplication.html#applicationFilePath
      Cheers,
      Leon

      [/quote]

      Hi Leon,
      Thanks for the support ,
      I have tried using the QCoreApplication::applicationFilePath
      @QString dbName=QCoreApplication::applicationFilePath()+“\test.sqlite”;@
      But it seems not opening the database.
      All I wanted to pack the sqlite database inside my application so that i can install the applications as a single unit.

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      0
      • L Offline
        L Offline
        leon.anavi
        wrote on 17 May 2011, 12:58 last edited by
        #18

        [quote author="Volker" date="1305635745"]Do you have a test.sqlite that actually is packed in your setup?
        [/quote]

        [quote author="vsh.vshnu" date="1305636668"]
        All I wanted to pack the sqlite database inside my application so that i can install the applications as a single unit.
        [/quote]

        I think you should follow Volker's hint :) Please read "MeeGo Packaging/Guidelines":http://wiki.meego.com/Packaging/Guidelines As you probably know MeeGo apps are distributed as rpm so you have to include your database into the rpm.

        http://anavi.org/

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        • V Offline
          V Offline
          vsh.vshnu
          wrote on 17 May 2011, 13:04 last edited by
          #19

          [quote author="leon.anavi" date="1305637109"][quote author="Volker" date="1305635745"]Do you have a test.sqlite that actually is packed in your setup?
          [/quote]

          [quote author="vsh.vshnu" date="1305636668"]
          All I wanted to pack the sqlite database inside my application so that i can install the applications as a single unit.
          [/quote]

          I think you should follow Volker's hint :) Please read "MeeGo Packaging/Guidelines":http://wiki.meego.com/Packaging/Guidelines As you probably know MeeGo apps are distributed as rpm so you have to include your database into the rpm.

          [/quote]

          Thanks for the help.. i will look into it..

          Thanks & Regards,
          Vsh.Vshnu

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          0
          • G goetz
            24 Feb 2011, 11:56

            SQLite databases cannot be stored in the Qt resource system. You must put it into regular files and distribute them along your application.

            The reason is simple: The database name is just the path to the file. Qt does not intercept the file name but hands it over directly to the SQLite functions (by calling toUtf8() on the “path”), which in turn try to open that file – and will eventually fail, of course.

            C Offline
            C Offline
            cawlfj
            wrote on 18 Feb 2017, 10:38 last edited by
            #20

            @goetz
            some time , we need store a read-only database file in the QRC file. just need read no need change.
            store in qrc file will avoid use change ,delete....etc it. and use database file (qsqlite3 ) will be fast get query result.

            now qt version is 5.8. can we do it ?

            best regards,

            M 1 Reply Last reply 18 Feb 2017, 10:55
            0
            • C cawlfj
              18 Feb 2017, 10:38

              @goetz
              some time , we need store a read-only database file in the QRC file. just need read no need change.
              store in qrc file will avoid use change ,delete....etc it. and use database file (qsqlite3 ) will be fast get query result.

              now qt version is 5.8. can we do it ?

              best regards,

              M Offline
              M Offline
              mrjj
              Lifetime Qt Champion
              wrote on 18 Feb 2017, 10:55 last edited by
              #21

              @cawlfj

              Hi
              If small database, you can just copy
              it to file system upon run and
              open it.

              Just override it each time.

              I do not think its possible to have a db in qrc.

              C 1 Reply Last reply 18 Feb 2017, 15:06
              1
              • M mrjj
                18 Feb 2017, 10:55

                @cawlfj

                Hi
                If small database, you can just copy
                it to file system upon run and
                open it.

                Just override it each time.

                I do not think its possible to have a db in qrc.

                C Offline
                C Offline
                cawlfj
                wrote on 18 Feb 2017, 15:06 last edited by
                #22

                @mrjj yes , you are right . we can do as your way. but i think if the db file in inside the qrc file will be more safety than copy out.
                Some time , some data , we don't want some body to get it .

                M 1 Reply Last reply 18 Feb 2017, 15:30
                0
                • C cawlfj
                  18 Feb 2017, 15:06

                  @mrjj yes , you are right . we can do as your way. but i think if the db file in inside the qrc file will be more safety than copy out.
                  Some time , some data , we don't want some body to get it .

                  M Offline
                  M Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on 18 Feb 2017, 15:30 last edited by
                  #23

                  @cawlfj
                  Well its not impossible to still dig it out using a hex editor.
                  For dbs, something like
                  https://www.zetetic.net/sqlcipher/about/
                  might be better.
                  Maybe you can use the dump trick to upload to a :mem based db.
                  http://stackoverflow.com/questions/3826552/in-python-how-can-i-load-a-sqlite-db-completely-to-memory-before-connecting-to
                  Disclaimer: i never tried this.

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                  2
                  • E Offline
                    E Offline
                    EdgarDinz
                    wrote on 3 Oct 2019, 18:08 last edited by EdgarDinz 10 Mar 2019, 18:10
                    #24

                    Consider using QTemporaryFile::createNativeFile:

                    QTemporaryFile *QTemporaryFile::createNativeFile(QFile &file)
                    QTemporaryFile *QTemporaryFile::createNativeFile(const QString &fileName)
                    

                    then you can pass a resource path as fileName.

                    1 Reply Last reply
                    0
                    • G goetz
                      24 Feb 2011, 11:56

                      SQLite databases cannot be stored in the Qt resource system. You must put it into regular files and distribute them along your application.

                      The reason is simple: The database name is just the path to the file. Qt does not intercept the file name but hands it over directly to the SQLite functions (by calling toUtf8() on the “path”), which in turn try to open that file – and will eventually fail, of course.

                      A Offline
                      A Offline
                      an_auto
                      wrote on 2 Dec 2020, 11:05 last edited by
                      #25
                      This post is deleted!
                      1 Reply Last reply
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