336 lines
11 KiB
Python
336 lines
11 KiB
Python
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import operator
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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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empty_fetchmany_value = ()
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allows_group_by_selected_pks = True
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related_fields_match_type = True
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# MySQL doesn't support sliced subqueries with IN/ALL/ANY/SOME.
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allow_sliced_subqueries_with_in = False
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has_select_for_update = True
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supports_forward_references = False
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supports_regex_backreferencing = False
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supports_date_lookup_using_string = False
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supports_timezones = False
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requires_explicit_null_ordering_when_grouping = True
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atomic_transactions = False
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can_clone_databases = True
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supports_comments = True
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supports_comments_inline = True
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supports_temporal_subtraction = True
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supports_slicing_ordering_in_compound = True
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supports_index_on_text_field = False
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supports_update_conflicts = True
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create_test_procedure_without_params_sql = """
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CREATE PROCEDURE test_procedure ()
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BEGIN
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DECLARE V_I INTEGER;
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SET 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)
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BEGIN
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DECLARE V_I INTEGER;
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SET V_I = P_I;
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END;
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"""
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create_test_table_with_composite_primary_key = """
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CREATE TABLE test_table_composite_pk (
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column_1 INTEGER NOT NULL,
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column_2 INTEGER NOT NULL,
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PRIMARY KEY(column_1, column_2)
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)
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"""
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# Neither MySQL nor MariaDB support partial indexes.
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supports_partial_indexes = False
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# COLLATE must be wrapped in parentheses because MySQL treats COLLATE as an
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# indexed expression.
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collate_as_index_expression = True
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supports_order_by_nulls_modifier = False
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order_by_nulls_first = True
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supports_logical_xor = True
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@cached_property
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def minimum_database_version(self):
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if self.connection.mysql_is_mariadb:
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return (10, 4)
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else:
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return (8,)
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@cached_property
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def test_collations(self):
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charset = "utf8"
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if (
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self.connection.mysql_is_mariadb
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and self.connection.mysql_version >= (10, 6)
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) or (
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not self.connection.mysql_is_mariadb
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and self.connection.mysql_version >= (8, 0, 30)
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):
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# utf8 is an alias for utf8mb3 in MariaDB 10.6+ and MySQL 8.0.30+.
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charset = "utf8mb3"
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return {
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"ci": f"{charset}_general_ci",
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"non_default": f"{charset}_esperanto_ci",
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"swedish_ci": f"{charset}_swedish_ci",
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}
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test_now_utc_template = "UTC_TIMESTAMP(6)"
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@cached_property
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def django_test_skips(self):
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skips = {
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"This doesn't work on MySQL.": {
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"db_functions.comparison.test_greatest.GreatestTests."
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"test_coalesce_workaround",
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"db_functions.comparison.test_least.LeastTests."
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"test_coalesce_workaround",
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},
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"Running on MySQL requires utf8mb4 encoding (#18392).": {
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"model_fields.test_textfield.TextFieldTests.test_emoji",
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"model_fields.test_charfield.TestCharField.test_emoji",
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},
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"MySQL doesn't support functional indexes on a function that "
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"returns JSON": {
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"schema.tests.SchemaTests.test_func_index_json_key_transform",
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},
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"MySQL supports multiplying and dividing DurationFields by a "
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"scalar value but it's not implemented (#25287).": {
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"expressions.tests.FTimeDeltaTests.test_durationfield_multiply_divide",
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},
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"UPDATE ... ORDER BY syntax on MySQL/MariaDB does not support ordering by"
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"related fields.": {
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"update.tests.AdvancedTests."
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"test_update_ordered_by_inline_m2m_annotation",
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"update.tests.AdvancedTests.test_update_ordered_by_m2m_annotation",
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},
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}
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if self.connection.mysql_is_mariadb and (
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10,
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4,
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3,
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) < self.connection.mysql_version < (10, 5, 2):
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skips.update(
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{
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"https://jira.mariadb.org/browse/MDEV-19598": {
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"schema.tests.SchemaTests."
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"test_alter_not_unique_field_to_primary_key",
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},
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}
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)
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if self.connection.mysql_is_mariadb and (
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10,
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4,
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12,
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) < self.connection.mysql_version < (10, 5):
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skips.update(
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{
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"https://jira.mariadb.org/browse/MDEV-22775": {
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"schema.tests.SchemaTests."
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"test_alter_pk_with_self_referential_field",
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},
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}
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)
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if not self.supports_explain_analyze:
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skips.update(
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{
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"MariaDB and MySQL >= 8.0.18 specific.": {
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"queries.test_explain.ExplainTests.test_mysql_analyze",
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},
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}
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)
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if "ONLY_FULL_GROUP_BY" in self.connection.sql_mode:
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skips.update(
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{
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"GROUP BY cannot contain nonaggregated column when "
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"ONLY_FULL_GROUP_BY mode is enabled on MySQL, see #34262.": {
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"aggregation.tests.AggregateTestCase."
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"test_group_by_nested_expression_with_params",
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},
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}
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)
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return skips
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@cached_property
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def _mysql_storage_engine(self):
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"Internal method used in Django tests. Don't rely on this from your code"
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return self.connection.mysql_server_data["default_storage_engine"]
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@cached_property
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def allows_auto_pk_0(self):
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"""
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Autoincrement primary key can be set to 0 if it doesn't generate new
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autoincrement values.
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"""
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return "NO_AUTO_VALUE_ON_ZERO" in self.connection.sql_mode
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@cached_property
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def update_can_self_select(self):
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return self.connection.mysql_is_mariadb and self.connection.mysql_version >= (
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10,
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3,
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2,
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)
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@cached_property
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def can_introspect_foreign_keys(self):
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"Confirm support for introspected foreign keys"
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return self._mysql_storage_engine != "MyISAM"
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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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"BinaryField": "TextField",
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"BooleanField": "IntegerField",
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"DurationField": "BigIntegerField",
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"GenericIPAddressField": "CharField",
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}
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@cached_property
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def can_return_columns_from_insert(self):
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return self.connection.mysql_is_mariadb and self.connection.mysql_version >= (
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10,
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5,
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0,
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)
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can_return_rows_from_bulk_insert = property(
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operator.attrgetter("can_return_columns_from_insert")
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)
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@cached_property
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def has_zoneinfo_database(self):
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return self.connection.mysql_server_data["has_zoneinfo_database"]
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@cached_property
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def is_sql_auto_is_null_enabled(self):
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return self.connection.mysql_server_data["sql_auto_is_null"]
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@cached_property
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def supports_over_clause(self):
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if self.connection.mysql_is_mariadb:
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return True
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return self.connection.mysql_version >= (8, 0, 2)
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supports_frame_range_fixed_distance = property(
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operator.attrgetter("supports_over_clause")
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)
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@cached_property
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def supports_column_check_constraints(self):
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if self.connection.mysql_is_mariadb:
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return True
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return self.connection.mysql_version >= (8, 0, 16)
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supports_table_check_constraints = property(
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operator.attrgetter("supports_column_check_constraints")
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)
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@cached_property
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def can_introspect_check_constraints(self):
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if self.connection.mysql_is_mariadb:
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return True
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return self.connection.mysql_version >= (8, 0, 16)
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@cached_property
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def has_select_for_update_skip_locked(self):
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if self.connection.mysql_is_mariadb:
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return self.connection.mysql_version >= (10, 6)
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return self.connection.mysql_version >= (8, 0, 1)
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@cached_property
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def has_select_for_update_nowait(self):
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if self.connection.mysql_is_mariadb:
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return True
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return self.connection.mysql_version >= (8, 0, 1)
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@cached_property
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def has_select_for_update_of(self):
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return (
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not self.connection.mysql_is_mariadb
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and self.connection.mysql_version >= (8, 0, 1)
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)
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@cached_property
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def supports_explain_analyze(self):
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return self.connection.mysql_is_mariadb or self.connection.mysql_version >= (
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8,
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0,
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18,
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)
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@cached_property
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def supported_explain_formats(self):
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# Alias MySQL's TRADITIONAL to TEXT for consistency with other
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# backends.
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formats = {"JSON", "TEXT", "TRADITIONAL"}
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if not self.connection.mysql_is_mariadb and self.connection.mysql_version >= (
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8,
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0,
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16,
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):
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formats.add("TREE")
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return formats
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@cached_property
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def supports_transactions(self):
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"""
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All storage engines except MyISAM support transactions.
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"""
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return self._mysql_storage_engine != "MyISAM"
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uses_savepoints = property(operator.attrgetter("supports_transactions"))
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can_release_savepoints = property(operator.attrgetter("supports_transactions"))
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@cached_property
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def ignores_table_name_case(self):
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return self.connection.mysql_server_data["lower_case_table_names"]
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@cached_property
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def supports_default_in_lead_lag(self):
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# To be added in https://jira.mariadb.org/browse/MDEV-12981.
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return not self.connection.mysql_is_mariadb
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@cached_property
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def can_introspect_json_field(self):
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if self.connection.mysql_is_mariadb:
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return self.can_introspect_check_constraints
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return True
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@cached_property
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def supports_index_column_ordering(self):
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if self._mysql_storage_engine != "InnoDB":
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return False
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if self.connection.mysql_is_mariadb:
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return self.connection.mysql_version >= (10, 8)
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return self.connection.mysql_version >= (8, 0, 1)
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@cached_property
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def supports_expression_indexes(self):
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return (
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not self.connection.mysql_is_mariadb
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and self._mysql_storage_engine != "MyISAM"
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and self.connection.mysql_version >= (8, 0, 13)
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)
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@cached_property
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def supports_select_intersection(self):
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is_mariadb = self.connection.mysql_is_mariadb
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return is_mariadb or self.connection.mysql_version >= (8, 0, 31)
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supports_select_difference = property(
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operator.attrgetter("supports_select_intersection")
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)
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@cached_property
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def can_rename_index(self):
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if self.connection.mysql_is_mariadb:
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return self.connection.mysql_version >= (10, 5, 2)
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return True
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