124 lines
4.8 KiB
Python
124 lines
4.8 KiB
Python
from django.db import DatabaseError, InterfaceError
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from django.db.backends.base.features import BaseDatabaseFeatures
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from django.utils.functional import cached_property
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class DatabaseFeatures(BaseDatabaseFeatures):
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# Oracle crashes with "ORA-00932: inconsistent datatypes: expected - got
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# BLOB" when grouping by LOBs (#24096).
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allows_group_by_lob = False
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interprets_empty_strings_as_nulls = True
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has_select_for_update = True
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has_select_for_update_nowait = True
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has_select_for_update_skip_locked = True
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has_select_for_update_of = True
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select_for_update_of_column = True
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can_return_columns_from_insert = True
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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_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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supports_deferrable_unique_constraints = True
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truncates_names = True
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supports_tablespaces = True
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supports_sequence_reset = False
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can_introspect_materialized_views = True
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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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# 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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supports_temporal_subtraction = True
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# Oracle doesn't ignore quoted identifiers case but the current backend
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# does by uppercasing all identifiers.
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ignores_table_name_case = True
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supports_index_on_text_field = False
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has_case_insensitive_like = False
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create_test_procedure_without_params_sql = """
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CREATE PROCEDURE "TEST_PROCEDURE" AS
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V_I INTEGER;
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BEGIN
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V_I := 1;
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END;
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"""
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create_test_procedure_with_int_param_sql = """
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CREATE PROCEDURE "TEST_PROCEDURE" (P_I INTEGER) AS
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V_I INTEGER;
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BEGIN
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V_I := P_I;
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END;
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"""
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supports_callproc_kwargs = True
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supports_over_clause = True
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supports_frame_range_fixed_distance = True
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supports_ignore_conflicts = False
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max_query_params = 2**16 - 1
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supports_partial_indexes = False
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supports_slicing_ordering_in_compound = True
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allows_multiple_constraints_on_same_fields = False
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supports_boolean_expr_in_select_clause = False
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supports_primitives_in_json_field = False
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supports_json_field_contains = False
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supports_collation_on_textfield = False
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test_collations = {
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'ci': 'BINARY_CI',
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'cs': 'BINARY',
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'non_default': 'SWEDISH_CI',
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'swedish_ci': 'SWEDISH_CI',
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}
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django_test_skips = {
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"Oracle doesn't support SHA224.": {
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'db_functions.text.test_sha224.SHA224Tests.test_basic',
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'db_functions.text.test_sha224.SHA224Tests.test_transform',
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},
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"Oracle doesn't support bitwise XOR.": {
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'expressions.tests.ExpressionOperatorTests.test_lefthand_bitwise_xor',
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'expressions.tests.ExpressionOperatorTests.test_lefthand_bitwise_xor_null',
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},
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"Oracle requires ORDER BY in row_number, ANSI:SQL doesn't.": {
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'expressions_window.tests.WindowFunctionTests.test_row_number_no_ordering',
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},
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'Raises ORA-00600: internal error code on Oracle 18.': {
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'model_fields.test_jsonfield.TestQuerying.test_usage_in_subquery',
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},
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}
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django_test_expected_failures = {
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# A bug in Django/cx_Oracle with respect to string handling (#23843).
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'annotations.tests.NonAggregateAnnotationTestCase.test_custom_functions',
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'annotations.tests.NonAggregateAnnotationTestCase.test_custom_functions_can_ref_other_functions',
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}
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@cached_property
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def introspected_field_types(self):
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return {
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**super().introspected_field_types,
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'GenericIPAddressField': 'CharField',
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'PositiveBigIntegerField': 'BigIntegerField',
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'PositiveIntegerField': 'IntegerField',
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'PositiveSmallIntegerField': 'IntegerField',
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'SmallIntegerField': 'IntegerField',
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'TimeField': 'DateTimeField',
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}
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@cached_property
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def supports_collation_on_charfield(self):
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with self.connection.cursor() as cursor:
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try:
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cursor.execute("SELECT CAST('a' AS VARCHAR2(4001)) FROM dual")
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except DatabaseError as e:
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if e.args[0].code == 910:
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return False
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raise
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return True
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@cached_property
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def has_json_object_function(self):
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# Oracle < 18 supports JSON_OBJECT() but it's not fully functional.
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return self.connection.oracle_version >= (18,)
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