QTableView is extremely slow (even for only 3000 rows)

Question

I have a table with 3000 rows and 8 columns. I use the QTableView. To insert items I do:

QStandardItem* vSItem = new QStandardItem();
vSItem->setText(\"Bl         


        

Answer 1

try this :

             QSqlDatabase db =QSqlDatabase::addDatabase( "QSQLITE");

      void SELECT_TO_TBLWID(QTableWidget * TBL, QString DbPath,QString SQL)
                  {
                      QSqlDatabase db2 =QSqlDatabase::database();
                      db2.setDatabaseName(DbPath);
                      if( !db2.open() )
                      {
                        qDebug() << db2.lastError();
                        qFatal( "Failed to connect." );
                      }
                        QSqlQuery qry;
                        qry.prepare(SQL);
                        if( !qry.exec() )
                          qDebug() << qry.lastError();
                        else
                        {
                           QSqlRecord rec = qry.record();

                             TBL->setColumnCount(rec.count());
                             int RW=0;
                             for( int r=0; qry.next(); r++ )
                                {RW++;}
                                TBL->setRowCount(RW);
                                for (int pr=RW;qry.previous();pr--){// do nothing}

                         for( int r=0; qry.next(); r++ )
                            {

                              for( int c=0; csetHorizontalHeaderItem(c,new QTableWidgetItem(rec.fieldName(c)));
                                  }

                              TBL->setItem(r, c, new QTableWidgetItem(qry.value(c).toString()));

                              }

                            }
                        }

                        db2.close();
                 }