2015-01-13 04:20:40 +08:00
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from django.db.backends.base.features import BaseDatabaseFeatures
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from django.db.utils import InterfaceError
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try:
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import pytz
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except ImportError:
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pytz = None
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class DatabaseFeatures(BaseDatabaseFeatures):
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empty_fetchmany_value = ()
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interprets_empty_strings_as_nulls = True
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uses_savepoints = True
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has_select_for_update = True
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has_select_for_update_nowait = True
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can_return_id_from_insert = True
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allow_sliced_subqueries = False
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supports_subqueries_in_group_by = False
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supports_transactions = True
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supports_timezones = False
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has_zoneinfo_database = pytz is not None
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supports_bitwise_or = False
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has_native_duration_field = True
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can_defer_constraint_checks = True
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supports_partially_nullable_unique_constraints = False
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truncates_names = True
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has_bulk_insert = True
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supports_tablespaces = True
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supports_sequence_reset = False
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2014-12-30 00:41:16 +08:00
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can_introspect_default = False # Pending implementation by an interested person.
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2015-01-13 04:20:40 +08:00
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can_introspect_max_length = False
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can_introspect_time_field = False
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atomic_transactions = False
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supports_combined_alters = False
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nulls_order_largest = True
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requires_literal_defaults = True
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closed_cursor_error_class = InterfaceError
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bare_select_suffix = " FROM DUAL"
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uppercases_column_names = True
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# select for update with limit can be achieved on Oracle, but not with the current backend.
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supports_select_for_update_with_limit = False
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2016-01-20 09:43:41 +08:00
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supports_temporal_subtraction = True
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2015-01-13 04:20:40 +08:00
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def introspected_boolean_field_type(self, field=None, created_separately=False):
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"""
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Some versions of Oracle -- we've seen this on 11.2.0.1 and suspect
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it goes back -- have a weird bug where, when an integer column is
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added to an existing table with a default, its precision is later
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reported on introspection as 0, regardless of the real precision.
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For Django introspection, this means that such columns are reported
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as IntegerField even if they are really BigIntegerField or BooleanField.
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The bug is solved in Oracle 11.2.0.2 and up.
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"""
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if self.connection.oracle_full_version < '11.2.0.2' and field and field.has_default() and created_separately:
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return 'IntegerField'
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return super(DatabaseFeatures, self).introspected_boolean_field_type(field, created_separately)
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