django1/django/db/backends/oracle/features.py

58 lines
2.3 KiB
Python

from django.db.backends.base.features import BaseDatabaseFeatures
from django.db.utils import InterfaceError
try:
import pytz
except ImportError:
pytz = None
class DatabaseFeatures(BaseDatabaseFeatures):
empty_fetchmany_value = ()
needs_datetime_string_cast = False
interprets_empty_strings_as_nulls = True
uses_savepoints = True
has_select_for_update = True
has_select_for_update_nowait = True
can_return_id_from_insert = True
allow_sliced_subqueries = False
supports_subqueries_in_group_by = False
supports_transactions = True
supports_timezones = False
has_zoneinfo_database = pytz is not None
supports_bitwise_or = False
has_native_duration_field = True
can_defer_constraint_checks = True
supports_partially_nullable_unique_constraints = False
truncates_names = True
has_bulk_insert = True
supports_tablespaces = True
supports_sequence_reset = False
can_introspect_max_length = False
can_introspect_time_field = False
atomic_transactions = False
supports_combined_alters = False
nulls_order_largest = True
requires_literal_defaults = True
connection_persists_old_columns = True
closed_cursor_error_class = InterfaceError
bare_select_suffix = " FROM DUAL"
uppercases_column_names = True
# select for update with limit can be achieved on Oracle, but not with the current backend.
supports_select_for_update_with_limit = False
def introspected_boolean_field_type(self, field=None, created_separately=False):
"""
Some versions of Oracle -- we've seen this on 11.2.0.1 and suspect
it goes back -- have a weird bug where, when an integer column is
added to an existing table with a default, its precision is later
reported on introspection as 0, regardless of the real precision.
For Django introspection, this means that such columns are reported
as IntegerField even if they are really BigIntegerField or BooleanField.
The bug is solved in Oracle 11.2.0.2 and up.
"""
if self.connection.oracle_full_version < '11.2.0.2' and field and field.has_default() and created_separately:
return 'IntegerField'
return super(DatabaseFeatures, self).introspected_boolean_field_type(field, created_separately)