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Return NEWID() from a SQL Query

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  • L Offline
    L Offline
    Lany
    wrote on last edited by
    #10

    I tried this

    qDebug() << query.exec("DECLARE @myid UNIQUEIDENTIFIER;"
                           "SET @myid = NEWID();"
                           "INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (@myid, '0');"
                           "SELECT @myid;");
    qDebug() << query.lastError().text();
    qDebug() << query.isActive();
    qDebug() << query.isSelect();
    qDebug() << query.next();
    qDebug() << query.value(0).toString();
    

    the result:

    true
    " "
    true
    false
    false
    QSqlQuery::value: not positioned on a valid record
    ""
    

    The query is not in a SELECT state, as mentioned by Christian, I think this driver can't handle multiple query.
    I'm going to look for another solution.

    Thanks!

    KroMignonK 1 Reply Last reply
    0
    • L Lany

      I tried this

      qDebug() << query.exec("DECLARE @myid UNIQUEIDENTIFIER;"
                             "SET @myid = NEWID();"
                             "INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (@myid, '0');"
                             "SELECT @myid;");
      qDebug() << query.lastError().text();
      qDebug() << query.isActive();
      qDebug() << query.isSelect();
      qDebug() << query.next();
      qDebug() << query.value(0).toString();
      

      the result:

      true
      " "
      true
      false
      false
      QSqlQuery::value: not positioned on a valid record
      ""
      

      The query is not in a SELECT state, as mentioned by Christian, I think this driver can't handle multiple query.
      I'm going to look for another solution.

      Thanks!

      KroMignonK Offline
      KroMignonK Offline
      KroMignon
      wrote on last edited by
      #11

      @Lany said in Return NEWID() from a SQL Query:

      I'm going to look for another solution.

      Perhaps you can try to send the SQL statement through QSqlDatabase::exec() ?

      It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

      1 Reply Last reply
      0
      • MucipM Offline
        MucipM Offline
        Mucip
        wrote on last edited by
        #12

        Hi,
        I think you want to insert a record and get the record serila number from DB.
        I guess it depends of what you use as database but in my case I use PostgreSQL and in this situation you have good SQL command like below:

        //Yeni kaydet yapılıyor...
            QSqlQuery kayitDb(baglanti::mdb());
            kayitDb.prepare("INSERT INTO teklif(teklif_no, teklif_tarih, teklif_tip, aciklama, cari_kod, teslim_sure, odeme_tip, odeme_vade, teklif_kur, proje_kod) "
                            "VALUES(:teklif_no, :teklif_tarih, :teklif_tip, :aciklama, :cari_kod, :teslim_sure, :odeme_tip, :odeme_vade, :teklif_kur, :proje_kod) RETURNING sira_no;");
        
            kayitDb.bindValue(":teklif_no", ui->lETeklifNo->text());
            kayitDb.bindValue(":teklif_tarih", ui->dateTeklifTarih->date());
            kayitDb.bindValue(":teklif_tip", ui->lETeklifTip->text() );
            kayitDb.bindValue(":aciklama", ui->plainAciklama->toPlainText());
            kayitDb.bindValue(":cari_kod", ui->lECariKod->text().toInt());
            kayitDb.bindValue(":teslim_sure", ui->lETeslim->text());
        
            kayitDb.bindValue(":odeme_tip", ui->cBOdeme->currentText() );
            kayitDb.bindValue(":odeme_vade", ui->lEVade->text() );
            kayitDb.bindValue(":teklif_kur", ui->comboKur->currentText() );
        
        
        
             //Sending and returning serial ID...
            if(kayitDb.exec() && kayitDb.first())
            {
                int belgeSiraNo = kayitDb.value(0).toInt();
                 ui->lESiraNo->setText(kayitDb.value(0).toString());
        
        
                    if(detayKaydet(belgeSiraNo))
                    {
                        //İşlem sonu
                        QMessageBox::information(this, "Tamamdır :)", "Fiş: " + ui->lESiraNo->text() + " sıra numarası ile kaydedildi.");
                        ekranTemizle();
                        iptalKonum();
                    }
        
            } else
            {
                QMessageBox::critical(this, "Hata", "Veritabanına ulaşılamadı!\n"+kayitDb.lastError().text() );
                return;
            }
        

        You're sending INSERT sql and reading returning serila value.

        Regards,
        Mucip:

        1 Reply Last reply
        0
        • L Lany

          Hello,

          I need the new id "NEWID()" created in this SQL Query, how can I get it?

          QSqlQuery query;
          query.exec("INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (NEWID(), '0');");
          

          I tried something like this without success

          QSqlQuery query;
          query.exec("DECLARE @myid UNIQUEIDENTIFIER;"
                     "SET @myid = NEWID();"
                     "INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (@myid, '0');"
                     "OUTPUT @myid;");
          query.next();
          qDebug() << query.value(0).toString();
          

          Thanks.

          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #13

          Just use the api, here you go: https://doc.qt.io/qt-5/qsqlquery.html#lastInsertId
          There's little sense in trying to emulate something that's not standard and is already implemented in the driver.

          Read and abide by the Qt Code of Conduct

          1 Reply Last reply
          0
          • L Offline
            L Offline
            Lany
            wrote on last edited by
            #14

            @kshegunov
            The ID is generated by the db not by "me"

            query.exec("INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (NEWID(), '0');");
            qDebug() << query.lastInsertId().toString();
            

            result:

            "0"
            

            In the db I have something like this :

            315FD979-F300-4493-A0B9-4B5FE64A8F45
            
            kshegunovK 1 Reply Last reply
            0
            • L Lany

              @kshegunov
              The ID is generated by the db not by "me"

              query.exec("INSERT INTO TBL_TEST (TEST_ID, TEST_01) VALUES (NEWID(), '0');");
              qDebug() << query.lastInsertId().toString();
              

              result:

              "0"
              

              In the db I have something like this :

              315FD979-F300-4493-A0B9-4B5FE64A8F45
              
              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by kshegunov
              #15

              @Lany said in Return NEWID() from a SQL Query:

              The ID is generated by the db not by "me"

              Yes, that's why the client library and the driver on top of it knows about it and can give it back to you. It's not necessary to do a query to emulate the behavior.

              PS. You need to handle the variant you got properly, not just blindly convert it to a string.

              qDebug() << query.lastInsertId().type();
              

              should help. Also, please make sure that TEST_ID is a primary key in the database (i.e. is properly indexed).

              Read and abide by the Qt Code of Conduct

              1 Reply Last reply
              0
              • L Offline
                L Offline
                Lany
                wrote on last edited by
                #16

                @kshegunov
                The returned type is :

                QVariant::double
                

                TEST_ID is a primary key (PK, uniqueidentifier, not null)
                If I try this

                qDebug() << query.lastInsertId().toDouble();
                

                The returned value is :

                0
                
                kshegunovK 1 Reply Last reply
                0
                • L Lany

                  @kshegunov
                  The returned type is :

                  QVariant::double
                  

                  TEST_ID is a primary key (PK, uniqueidentifier, not null)
                  If I try this

                  qDebug() << query.lastInsertId().toDouble();
                  

                  The returned value is :

                  0
                  
                  kshegunovK Offline
                  kshegunovK Offline
                  kshegunov
                  Moderators
                  wrote on last edited by kshegunov
                  #17

                  What database engine is this? MySQL, PgSQL, MSSQL?

                  Read and abide by the Qt Code of Conduct

                  1 Reply Last reply
                  0
                  • L Offline
                    L Offline
                    Lany
                    wrote on last edited by
                    #18

                    Microsoft SQL server 2014

                    kshegunovK 1 Reply Last reply
                    0
                    • L Lany

                      Microsoft SQL server 2014

                      kshegunovK Offline
                      kshegunovK Offline
                      kshegunov
                      Moderators
                      wrote on last edited by kshegunov
                      #19

                      Right, sorry I was misled about the talk about MySql. Anyways, you really should auto-generate the id, not insert it manually (probably not the problem here, just saying). I haven't worked with MS for ages. Check if the driver supports lastInstertId at all.

                      qDebug() << db.driver()->hasFeature(QSqlDriver::LastInsertId);
                      

                      If it doesn't then you're stuck to using non-standard queries. That means once you run the insert, you run a second query to fetch the inserted id.

                      Read and abide by the Qt Code of Conduct

                      1 Reply Last reply
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