Exemplo n.º 1
0
 def fetch(row, direction=pytis.data.FORWARD):
     result = self._data.fetchone(direction=direction)
     if result is None:
         # In theory this shouldn't happen but it actually happens so we
         # have to attempt some workaround here.
         data.rewind()
         if row > 0:
             data.skip(row - 1, direction=pytis.data.FORWARD)
         result = data.fetchone(direction=pytis.data.FORWARD)
         if result is None:
             # This shouldn't happen at all but it still happens.
             log(DEBUG, "Missing grid row")
             if require:
                 raise Exception('Missing row', row)
             return None
         else:
             log(DEBUG, "Grid data synchronization error")
     self._presented_row.set_row(result)
     the_row = copy.copy(self._presented_row)
     self._current_row = self._CurrentRow(row, the_row)
Exemplo n.º 2
0
 def fetch(row, direction=pytis.data.FORWARD):
     result = self._data.fetchone(direction=direction)
     if result is None:
         # In theory this shouldn't happen but it actually happens so we
         # have to attempt some workaround here.
         data.rewind()
         if row > 0:
             data.skip(row - 1, direction=pytis.data.FORWARD)
         result = data.fetchone(direction=pytis.data.FORWARD)
         if result is None:
             # This shouldn't happen at all but it still happens.
             log(DEBUG, "Missing grid row")
             if require:
                 raise Exception('Missing row', row)
             return None
         else:
             log(DEBUG, "Grid data synchronization error")
     self._presented_row.set_row(result)
     the_row = copy.copy(self._presented_row)
     self._current_row = self._CurrentRow(row, the_row)
Exemplo n.º 3
0
    def _retrieve_row(self, row, require=True):
        data = self._data

        def fetch(row, direction=pytis.data.FORWARD):
            result = self._data.fetchone(direction=direction)
            if result is None:
                # In theory this shouldn't happen but it actually happens so we
                # have to attempt some workaround here.
                data.rewind()
                if row > 0:
                    data.skip(row - 1, direction=pytis.data.FORWARD)
                result = data.fetchone(direction=pytis.data.FORWARD)
                if result is None:
                    # This shouldn't happen at all but it still happens.
                    log(DEBUG, "Missing grid row")
                    if require:
                        raise Exception('Missing row', row)
                    return None
                else:
                    log(DEBUG, "Grid data synchronization error")
            self._presented_row.set_row(result)
            the_row = copy.copy(self._presented_row)
            self._current_row = self._CurrentRow(row, the_row)

        current = self._current_row
        if not current:
            data.rewind()
            if row > 0:
                # Tento fetch pouze zabezpečí přednačtení bufferu v dopředném
                # směru od začátku dat.  To je potřeba, protože grid
                # načítá řádky od konce a bez tohoto hacku by buffer obsahoval
                # pouze zobrazené řádky.  Lépe by to však bylo ošetřit lepší
                # strategií plnění bufferu v dbdata.py ...
                fetch(0)
                data.skip(row - 1, direction=pytis.data.FORWARD)
            fetch(row)
        elif row != current.row:
            last = data.last_row_number()
            if row > last:
                skip = row - last - 1
                direction = pytis.data.FORWARD
            elif row == last:
                data.skip(1, pytis.data.BACKWARD)
                skip = 0
                direction = pytis.data.FORWARD
            else:
                skip = last - row - 1
                direction = pytis.data.BACKWARD
            data.skip(skip, direction=direction)
            fetch(row, direction)
        return self._current_row.the_row
Exemplo n.º 4
0
 def _retrieve_row(self, row, require=True):
     data = self._data
     def fetch(row, direction=pytis.data.FORWARD):
         result = self._data.fetchone(direction=direction)
         if result is None:
             # In theory this shouldn't happen but it actually happens so we
             # have to attempt some workaround here.
             data.rewind()
             if row > 0:
                 data.skip(row - 1, direction=pytis.data.FORWARD)
             result = data.fetchone(direction=pytis.data.FORWARD)
             if result is None:
                 # This shouldn't happen at all but it still happens.
                 log(DEBUG, "Missing grid row")
                 if require:
                     raise Exception('Missing row', row)
                 return None
             else:
                 log(DEBUG, "Grid data synchronization error")
         self._presented_row.set_row(result)
         the_row = copy.copy(self._presented_row)
         self._current_row = self._CurrentRow(row, the_row)
     current = self._current_row
     if not current:
         data.rewind()
         if row > 0:
             # Tento fetch pouze zabezpečí přednačtení bufferu v dopředném
             # směru od začátku dat.  To je potřeba, protože grid
             # načítá řádky od konce a bez tohoto hacku by buffer obsahoval
             # pouze zobrazené řádky.  Lépe by to však bylo ošetřit lepší
             # strategií plnění bufferu v dbdata.py ...
             fetch(0)
             data.skip(row - 1, direction=pytis.data.FORWARD)
         fetch(row)
     elif row != current.row:
         last = data.last_row_number()
         if row > last:
             skip = row - last - 1
             direction = pytis.data.FORWARD
         elif row == last:
             data.skip(1, pytis.data.BACKWARD)
             skip = 0
             direction = pytis.data.FORWARD
         else:
             skip = last - row - 1
             direction = pytis.data.BACKWARD
         data.skip(skip, direction=direction)
         fetch(row, direction)
     return self._current_row.the_row