Question

I have CArray/CMap with IDs.
On the SQL Table there are: ID, Value, StartTime, EndTime.
I receive StartTime and EndTime and need to delete all IDs that appear on that CArray.
So there is a need for query such as:
“delete from table where id in ( list[0], list[1], list[2]. … list[n] ) and time between T1 and T2”
My problem is how to implement the “in (..)” how to transfer the IDs that on CArray ?

Using CDatabase.executeSQL(QUERY) with CommitTrans and CommitTrans

Thanks

Answer 1

The simple you can do is this (provided you have CArray and it is called arId):

CString sql, item;
sql = _T("delete from table where id ");
if(arId.GetCount() == 1)
{
  item.Format(_T(" = %d"), arId[0]);
  sql += item;
}
else
{
  for(int i = 0; i < arId.GetCount(); ++i)
  {
    if(i == 0) sql += _T("IN (");
    item.Format(_T("%d"), arId[0]);
    if(i == arId.GetCount()-1)
      item += _T(")");
    else
      item += _T(", ");
    sql += item;
  }
}
CDatabase.executeSQL(sql);

For CMap replace the for(i = 0;…) with the POSITION pos = mapId.GetStartPosition() etc.