--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/db/backends/mysql/validation.py	Wed Jan 20 00:34:04 2010 +0100
@@ -0,0 +1,28 @@
+from django.db.backends import BaseDatabaseValidation
+
+class DatabaseValidation(BaseDatabaseValidation):
+    def validate_field(self, errors, opts, f):
+        """
+        There are some field length restrictions for MySQL:
+
+        - Prior to version 5.0.3, character fields could not exceed 255
+          characters in length.
+        - No character (varchar) fields can have a length exceeding 255
+          characters if they have a unique index on them.
+        """
+        from django.db import models
+        from django.db import connection
+        db_version = connection.get_server_version()
+        varchar_fields = (models.CharField, models.CommaSeparatedIntegerField,
+                models.SlugField)
+        if isinstance(f, varchar_fields) and f.max_length > 255:
+            if db_version < (5, 0, 3):
+                msg = '"%(name)s": %(cls)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 %(version)s).'
+            elif f.unique == True:
+                msg = '"%(name)s": %(cls)s cannot have a "max_length" greater than 255 when using "unique=True".'
+            else:
+                msg = None
+
+            if msg:
+                errors.add(opts, msg % {'name': f.name, 'cls': f.__class__.__name__, 'version': '.'.join([str(n) for n in db_version[:3]])})
+