Added convenience method for viewing Query SQL without params.

This is the old Query.as_sql() method revived: it's like Query.__str__,
but the parameters aren't substituted into the placeholders. Thus, it's
a more accurate representation of the SQL the (default) backend will
see. Entirely internal.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16655 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/sql/query.py

@@ -156,14 +156,21 @@ class Query(object):
     def __str__(self):
         """
         Returns the query as a string of SQL with the parameter values
-        substituted in.
+        substituted in (use sql_with_params() to see the unsubstituted string).
 
         Parameter values won't necessarily be quoted correctly, since that is
         done by the database interface at execution time.
         """
-        sql, params = self.get_compiler(DEFAULT_DB_ALIAS).as_sql()
+        sql, params = self.sql_with_params()
         return sql % params
 
+    def sql_with_params(self):
+        """
+        Returns the query as an SQL string and the parameters that will be
+        subsituted into the query.
+        """
+        return self.get_compiler(DEFAULT_DB_ALIAS).as_sql()
+
     def __deepcopy__(self, memo):
         result = self.clone(memo=memo)
         memo[id(self)] = result