def _load_on_ident(self, key, refresh_state=None, lockmode=None,
only_load_props=None):
"""Load the given identity key from the database."""
lockmode = lockmode or self._lockmode
if key is not None:
ident = key[1]
else:
ident = None
if refresh_state is None:
q = self._clone()
q._get_condition()
else:
q = self._clone()
if ident is not None:
mapper = self._mapper_zero()
(_get_clause, _get_params) = mapper._get_clause
# None present in ident - turn those comparisons
# into "IS NULL"
if None in ident:
nones = set([
_get_params[col].key for col, value in
zip(mapper.primary_key, ident) if value is None
])
_get_clause = sql_util.adapt_criterion_to_null(
_get_clause, nones)
_get_clause = q._adapt_clause(_get_clause, True, False)
# XXX ods: use current criterion
if q._criterion is not None:
q._criterion &= _get_clause
else:
q._criterion = _get_clause
params = dict([
(_get_params[primary_key].key, id_val)
for id_val, primary_key in zip(ident, mapper.primary_key)
])
q._params = params
if lockmode is not None:
q._lockmode = lockmode
q._get_options(
populate_existing=bool(refresh_state),
version_check=(lockmode is not None),
only_load_props=only_load_props,
refresh_state=refresh_state)
q._order_by = None
try:
return q.one()
except orm_exc.NoResultFound:
return None
def _lazy_none_clause(self, reverse_direction=False, adapt_source=None):
if not reverse_direction:
(criterion, bind_to_col, rev) = (self.__lazywhere, self.__bind_to_col, self._equated_columns)
else:
(criterion, bind_to_col, rev) = LazyLoader._create_lazy_clause(self.parent_property, reverse_direction=reverse_direction)
criterion = sql_util.adapt_criterion_to_null(criterion, bind_to_col)
if adapt_source:
criterion = adapt_source(criterion)
return criterion
def _lazy_none_clause(self, reverse_direction=False, adapt_source=None):
if not reverse_direction:
criterion, bind_to_col, rev = \
self.__lazywhere, \
self.__bind_to_col,\
self._equated_columns
else:
criterion, bind_to_col, rev = \
LazyLoader._create_lazy_clause(
self.parent_property,
reverse_direction=reverse_direction)
criterion = sql_util.adapt_criterion_to_null(criterion, bind_to_col)
if adapt_source:
criterion = adapt_source(criterion)
return criterion
