Onde datatable with difirent cursors

I have one datatable object and want in diffirent cases show results from diffirent sql cursors..is that good way? I try it but it doesnt work,becouse after first showing i cannot add another columns and delete previous for second showing..

Code:

---

void QFormAdmin::OnPhysicTbPressed(int nId)
{ 
  int nCols = dtMain->numCols();
  int nRows = dtMain->numRows();
 
  // try to clean data table
  for (int i=0; i<nCols; i++)
    dtMain->removeColumn(0);
 
  for (int i=0; i<nRows; i++)
    dtMain->removeRow(0);
 
  dtMain->repaint();
 
  switch(nId)
  {
    // виклик редактора гілок
    case 1:  
            {
              QSqlSelectCursor* curBr = new QSqlSelectCursor( "SELECT deleted  FROM branches");
 
              dtMain->setSqlCursor(curBr,false,true );
 
              dtMain->addColumn("deleted", tr("Імя1"));    
 
              dtMain->refresh();
              break;
            }
 
    // виклик редактора контролерів
    case 2:
            {
              QSqlSelectCursor* curCtl = new QSqlSelectCursor( "SELECT controlers.description,controlers.logical_id,controlers.physical_id,controlers.active,controlers.branch,branches.description AS br_name,branches.port,branches.ip_address FROM controlers \
                                                         LEFT JOIN branches ON controlers.branch = branches.id");
 
              dtMain->setSqlCursor(curCtl,false,true ); 
 
              dtMain->addColumn("description", tr("Імя"));
              dtMain->addColumn("logical_id", tr("Логічний №"));
              dtMain->addColumn("physical_id", tr("Фізичний №"));
              dtMain->addColumn("active", tr("Активний"));
              dtMain->addColumn("br_name", tr("Імя вітки"));
              dtMain->addColumn("port", tr("Порт"));
              dtMain->addColumn("ip_address", tr("IP-адрес"));
 
              dtMain->refresh();
              break;
            }          
  } 
}

---

After first call i have case 1 and see one columns in datatable. After second call i have case 2: and i create 7 columns but i see one previous column with new data :confused:
Any suggestions pls...

Try:

Code:

---

void QFormAdmin::OnPhysicTbPressed(int nId)
{ 
  // Do, or do not. There is no try. ;)
  const int nCols = dtMain->numCols();
  for (int i=0; i<nCols; i++) {
    dtMain->removeColumn(0);
  }
 
  switch(nId)
  {
    // виклик редактора гілок
    case 1:  
            {
              QSqlSelectCursor* curBr = new QSqlSelectCursor( ... );
 
              dtMain->setSqlCursor(curBr,false,true );
 
              dtMain->addColumn("deleted", tr("Імя1"));    
 
              dtMain->refresh( QDataTable::RefreshAll );
              break;
            }
 
    // виклик редактора контролерів
    case 2:
            {
              QSqlSelectCursor* curCtl = new QSqlSelectCursor( ... );
 
              dtMain->setSqlCursor(curCtl,false,true ); 
 
              dtMain->addColumn("description", tr("Імя"));
              ...
              dtMain->addColumn("ip_address", tr("IP-адрес"));
 
              dtMain->refresh( QDataTable::RefreshAll );
              break;
            }          
  } 
}

---

Emm..my stupid thoughtlessness :)
Ok thanks its work perfect with remove :)