[1.0.X] Fixed #10488: fixed DB cache backend test failures in Oracle. Backport of [10051] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10052 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/cache/backends/db.py

@@ -35,7 +35,8 @@ class CacheClass(BaseCache):
             cursor.execute("DELETE FROM %s WHERE cache_key = %%s" % self._table, [key])
             transaction.commit_unless_managed()
             return default
-        return pickle.loads(base64.decodestring(row[1]))
+        value = connection.ops.process_clob(row[1])
+        return pickle.loads(base64.decodestring(value))
 
     def set(self, key, value, timeout=None):
         self._base_set('set', key, value, timeout)

django/db/backends/__init__.py

@@ -212,6 +212,13 @@ class BaseDatabaseOperations(object):
         """
         return 'DEFAULT'
 
+    def process_clob(self, value):
+        """
+        Returns the value of a CLOB column, for backends that return a locator
+        object that requires additional processing.
+        """
+        return value
+
     def query_class(self, DefaultQueryClass):
         """
         Given the default Query class, returns a custom Query class

django/db/backends/oracle/base.py

@@ -115,6 +115,11 @@ WHEN (new.%(col_name)s IS NULL)
     def prep_for_iexact_query(self, x):
         return x
 
+    def process_clob(self, value):
+        if value is None:
+            return u''
+        return force_unicode(value.read())
+
     def query_class(self, DefaultQueryClass):
         return query.query_class(DefaultQueryClass, Database)