Fixed #5461 -- Refactored the database backend code to use classes for the creation and introspection modules. Introduces a new validation module for DB-specific validation. This is a backwards incompatible change; see the wiki for details.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8296 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 13 insertions, 0 deletions

diff --git a/django/db/backends/mysql/validation.py b/django/db/backends/mysql/validation.py
new file mode 100644
index 0000000000..85354a8468
--- /dev/null
+++ b/django/db/backends/mysql/validation.py
@@ -0,0 +1,13 @@
+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]])))
+    
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