1
0
Hotel/env/lib/python3.5/site-packages/django/db/backends/mysql/validation.py

61 lines
2.5 KiB
Python

from django.core import checks
from django.db.backends.base.validation import BaseDatabaseValidation
from django.utils.version import get_docs_version
class DatabaseValidation(BaseDatabaseValidation):
def check(self, **kwargs):
issues = super().check(**kwargs)
issues.extend(self._check_sql_mode(**kwargs))
return issues
def _check_sql_mode(self, **kwargs):
with self.connection.cursor() as cursor:
cursor.execute("SELECT @@sql_mode")
sql_mode = cursor.fetchone()
modes = set(sql_mode[0].split(',') if sql_mode else ())
if not (modes & {'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES'}):
return [checks.Warning(
"MySQL Strict Mode is not set for database connection '%s'" % self.connection.alias,
hint="MySQL's Strict Mode fixes many data integrity problems in MySQL, "
"such as data truncation upon insertion, by escalating warnings into "
"errors. It is strongly recommended you activate it. See: "
"https://docs.djangoproject.com/en/%s/ref/databases/#mysql-sql-mode"
% (get_docs_version(),),
id='mysql.W002',
)]
return []
def check_field_type(self, field, field_type):
"""
MySQL has the following field length restriction:
No character (varchar) fields can have a length exceeding 255
characters if they have a unique index on them.
MySQL doesn't support a database index on some data types.
"""
errors = []
if (field_type.startswith('varchar') and field.unique and
(field.max_length is None or int(field.max_length) > 255)):
errors.append(
checks.Error(
'MySQL does not allow unique CharFields to have a max_length > 255.',
obj=field,
id='mysql.E001',
)
)
if field.db_index and field_type.lower() in self.connection._limited_data_types:
errors.append(
checks.Warning(
'MySQL does not support a database index on %s columns.'
% field_type,
hint=(
"An index won't be created. Silence this warning if "
"you don't care about it."
),
obj=field,
id='fields.W162',
)
)
return errors