112 lines
4.1 KiB
Python
112 lines
4.1 KiB
Python
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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update_can_self_select = False
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allows_group_by_pk = 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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can_introspect_autofield = True
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can_introspect_binary_field = False
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can_introspect_small_integer_field = True
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can_introspect_positive_integer_field = True
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introspected_boolean_field_type = 'IntegerField'
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supports_index_column_ordering = False
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supports_timezones = False
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requires_explicit_null_ordering_when_grouping = True
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allows_auto_pk_0 = False
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uses_savepoints = True
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can_release_savepoints = True
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atomic_transactions = False
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supports_column_check_constraints = False
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supports_table_check_constraints = False
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can_clone_databases = True
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supports_temporal_subtraction = True
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supports_select_intersection = False
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supports_select_difference = False
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supports_slicing_ordering_in_compound = 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 ()
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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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db_functions_convert_bytes_to_str = True
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# Alias MySQL's TRADITIONAL to TEXT for consistency with other backends.
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supported_explain_formats = {'JSON', 'TEXT', 'TRADITIONAL'}
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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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with self.connection.cursor() as cursor:
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cursor.execute("SELECT ENGINE FROM INFORMATION_SCHEMA.ENGINES WHERE SUPPORT = 'DEFAULT'")
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result = cursor.fetchone()
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return result[0]
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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 has_zoneinfo_database(self):
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# Test if the time zone definitions are installed.
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with self.connection.cursor() as cursor:
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cursor.execute("SELECT 1 FROM mysql.time_zone LIMIT 1")
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return cursor.fetchone() is not None
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@cached_property
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def is_sql_auto_is_null_enabled(self):
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with self.connection.cursor() as cursor:
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cursor.execute('SELECT @@SQL_AUTO_IS_NULL')
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result = cursor.fetchone()
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return result and result[0] == 1
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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 self.connection.mysql_version >= (10, 2)
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return self.connection.mysql_version >= (8, 0, 2)
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@cached_property
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def has_select_for_update_skip_locked(self):
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return not self.connection.mysql_is_mariadb and self.connection.mysql_version >= (8, 0, 1)
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has_select_for_update_nowait = has_select_for_update_skip_locked
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@cached_property
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def needs_explain_extended(self):
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# EXTENDED is deprecated (and not required) in MySQL 5.7.
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return not self.connection.mysql_is_mariadb and self.connection.mysql_version < (5, 7)
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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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@cached_property
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def ignores_table_name_case(self):
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with self.connection.cursor() as cursor:
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cursor.execute('SELECT @@LOWER_CASE_TABLE_NAMES')
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result = cursor.fetchone()
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return result and result[0] != 0
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