109 lines
3.9 KiB
Python
109 lines
3.9 KiB
Python
from django.db.backends.base.features import BaseDatabaseFeatures
|
|
from django.utils.functional import cached_property
|
|
|
|
|
|
class DatabaseFeatures(BaseDatabaseFeatures):
|
|
empty_fetchmany_value = ()
|
|
update_can_self_select = False
|
|
allows_group_by_pk = True
|
|
related_fields_match_type = True
|
|
# MySQL doesn't support sliced subqueries with IN/ALL/ANY/SOME.
|
|
allow_sliced_subqueries_with_in = False
|
|
has_select_for_update = True
|
|
supports_forward_references = False
|
|
supports_regex_backreferencing = False
|
|
supports_date_lookup_using_string = False
|
|
can_introspect_autofield = True
|
|
can_introspect_binary_field = False
|
|
can_introspect_small_integer_field = True
|
|
can_introspect_positive_integer_field = True
|
|
introspected_boolean_field_type = 'IntegerField'
|
|
supports_index_column_ordering = False
|
|
supports_timezones = False
|
|
requires_explicit_null_ordering_when_grouping = True
|
|
allows_auto_pk_0 = False
|
|
uses_savepoints = True
|
|
can_release_savepoints = True
|
|
atomic_transactions = False
|
|
supports_column_check_constraints = False
|
|
can_clone_databases = True
|
|
supports_temporal_subtraction = True
|
|
supports_select_intersection = False
|
|
supports_select_difference = False
|
|
supports_slicing_ordering_in_compound = True
|
|
supports_index_on_text_field = False
|
|
has_case_insensitive_like = False
|
|
create_test_procedure_without_params_sql = """
|
|
CREATE PROCEDURE test_procedure ()
|
|
BEGIN
|
|
DECLARE V_I INTEGER;
|
|
SET V_I = 1;
|
|
END;
|
|
"""
|
|
create_test_procedure_with_int_param_sql = """
|
|
CREATE PROCEDURE test_procedure (P_I INTEGER)
|
|
BEGIN
|
|
DECLARE V_I INTEGER;
|
|
SET V_I = P_I;
|
|
END;
|
|
"""
|
|
db_functions_convert_bytes_to_str = True
|
|
# Alias MySQL's TRADITIONAL to TEXT for consistency with other backends.
|
|
supported_explain_formats = {'JSON', 'TEXT', 'TRADITIONAL'}
|
|
|
|
@cached_property
|
|
def _mysql_storage_engine(self):
|
|
"Internal method used in Django tests. Don't rely on this from your code"
|
|
with self.connection.cursor() as cursor:
|
|
cursor.execute("SELECT ENGINE FROM INFORMATION_SCHEMA.ENGINES WHERE SUPPORT = 'DEFAULT'")
|
|
result = cursor.fetchone()
|
|
return result[0]
|
|
|
|
@cached_property
|
|
def can_introspect_foreign_keys(self):
|
|
"Confirm support for introspected foreign keys"
|
|
return self._mysql_storage_engine != 'MyISAM'
|
|
|
|
@cached_property
|
|
def has_zoneinfo_database(self):
|
|
# Test if the time zone definitions are installed.
|
|
with self.connection.cursor() as cursor:
|
|
cursor.execute("SELECT 1 FROM mysql.time_zone LIMIT 1")
|
|
return cursor.fetchone() is not None
|
|
|
|
@cached_property
|
|
def is_sql_auto_is_null_enabled(self):
|
|
with self.connection.cursor() as cursor:
|
|
cursor.execute('SELECT @@SQL_AUTO_IS_NULL')
|
|
result = cursor.fetchone()
|
|
return result and result[0] == 1
|
|
|
|
@cached_property
|
|
def supports_over_clause(self):
|
|
return self.connection.mysql_version >= (8, 0, 2)
|
|
|
|
@cached_property
|
|
def has_select_for_update_skip_locked(self):
|
|
return self.connection.mysql_version >= (8, 0, 1)
|
|
|
|
has_select_for_update_nowait = has_select_for_update_skip_locked
|
|
|
|
@cached_property
|
|
def needs_explain_extended(self):
|
|
# EXTENDED is deprecated (and not required) in 5.7 and removed in 8.0.
|
|
return self.connection.mysql_version < (5, 7)
|
|
|
|
@cached_property
|
|
def supports_transactions(self):
|
|
"""
|
|
All storage engines except MyISAM support transactions.
|
|
"""
|
|
return self._mysql_storage_engine != 'MyISAM'
|
|
|
|
@cached_property
|
|
def ignores_table_name_case(self):
|
|
with self.connection.cursor() as cursor:
|
|
cursor.execute('SELECT @@LOWER_CASE_TABLE_NAMES')
|
|
result = cursor.fetchone()
|
|
return result and result[0] != 0
|