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