+
−from django.db.backends import BaseDatabaseValidation
+
−
+
−class DatabaseValidation(BaseDatabaseValidation):
+
−    def validate_field(self, errors, opts, f):
+
−        "Prior to MySQL 5.0.3, character fields could not exceed 255 characters"
+
−        from django.db import models
+
−        from django.db import connection
+
−        db_version = connection.get_server_version()
+
−        if db_version < (5, 0, 3) and isinstance(f, (models.CharField, models.CommaSeparatedIntegerField, models.SlugField)) and f.max_length > 255:
+
−            errors.add(opts,
+
−                '"%s": %s cannot have a "max_length" greater than 255 when you are using a version of MySQL prior to 5.0.3 (you are using %s).' % 
+
−                (f.name, f.__class__.__name__, '.'.join([str(n) for n in db_version[:3]])))
+
−