sqlalchemy: Merged revisions 4054 to 4185 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/sqlalchemy@4186 bcc190cf-cafb-0310-a4f2-bffc1f526a37

2 files changed, 3 insertions, 12 deletions

diff --git a/django/db/__init__.py b/django/db/__init__.py
index e5b4d32e0b..4176b5aa79 100644
--- a/django/db/__init__.py
+++ b/django/db/__init__.py
@@ -18,7 +18,7 @@ except ImportError, e:
     available_backends = [f for f in os.listdir(backend_dir) if not f.startswith('_') and not f.startswith('.') and not f.endswith('.py') and not f.endswith('.pyc')]
     available_backends.sort()
     if settings.DATABASE_ENGINE not in available_backends:
-        raise ImproperlyConfigured, "%r isn't an available database backend. vailable options are: %s" % \
+        raise ImproperlyConfigured, "%r isn't an available database backend. Available options are: %s" % \
             (settings.DATABASE_ENGINE, ", ".join(map(repr, available_backends)))
     else:
         raise # If there's some other error, this must be an error in Django itself.
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index bc1eaf0a6a..8e8d68aad5 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -457,9 +457,7 @@ class DateField(Field):
 
     def get_db_prep_save(self, value):
         # Casts dates into string format for entry into database.
-        if isinstance(value, datetime.datetime):
-            value = value.date().strftime('%Y-%m-%d')
-        elif isinstance(value, datetime.date):
+        if value is not None:
             value = value.strftime('%Y-%m-%d')
         return Field.get_db_prep_save(self, value)
 
@@ -489,19 +487,12 @@ class DateTimeField(DateField):
 
     def get_db_prep_save(self, value):
         # Casts dates into string format for entry into database.
-        if isinstance(value, datetime.datetime):
+        if value is not None:
             # MySQL will throw a warning if microseconds are given, because it
             # doesn't support microseconds.
             if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
                 value = value.replace(microsecond=0)
             value = str(value)
-        elif isinstance(value, datetime.date):
-            # MySQL will throw a warning if microseconds are given, because it
-            # doesn't support microseconds.
-            if settings.DATABASE_ENGINE == 'mysql' and hasattr(value, 'microsecond'):
-                value = datetime.datetime(value.year, value.month, value.day, microsecond=0)
-            value = str(value)
-            
         return Field.get_db_prep_save(self, value)
 
     def get_db_prep_lookup(self, lookup_type, value):