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[3.0.x] Fixed #30786 -- Used CONVERT_TZ to check if the time zone definitions are installed on MySQL.

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Replaced a timezone check in the MySQL backend with one that doesn't
require access to the mysql.time_zone database.

Backport of 3346b78a8a from master
This commit is contained in:
Andrew
2019-09-19 22:23:33 -04:00
committed by Mariusz Felisiak
parent e4dc1b8cac
commit def1857d9b
1 changed files with 4 additions and 3 deletions
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7
django/db/backends/mysql/features.py
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@@ -69,10 +69,11 @@ class DatabaseFeatures(BaseDatabaseFeatures):
@cached_property @cached_property
def has_zoneinfo_database(self): def has_zoneinfo_database(self):
# Test if the time zone definitions are installed. # Test if the time zone definitions are installed. CONVERT_TZ returns
# NULL if 'UTC' timezone isn't loaded into the mysql.time_zone.
with self.connection.cursor() as cursor: with self.connection.cursor() as cursor:
cursor.execute("SELECT 1 FROM mysql.time_zone LIMIT 1") cursor.execute("SELECT CONVERT_TZ('2001-01-01 01:00:00', 'UTC', 'UTC')")
return cursor.fetchone() is not None return cursor.fetchone()[0] is not None
@cached_property @cached_property
def is_sql_auto_is_null_enabled(self): def is_sql_auto_is_null_enabled(self):