- added native INTERVAL type to the dialect. This supports

  only the DAY TO SECOND interval type so far due to lack
  of support in cx_oracle for YEAR TO MONTH. [ticket:1467]
- The Interval type includes a "native" flag which controls
  if native INTERVAL types (postgresql + oracle) are selected
  if available, or not.  "day_precision" and "second_precision"
  arguments are also added which propagate as appropriately
  to these native types. Related to [ticket:1467].
- DefaultDialect.type_descriptor moves back to being per-dialect.
  TypeEngine/TypeDecorator key type impls to the dialect class
  + server_version_info so that the colspecs dict can be modified
  per-dialect based on server version.
- Fixed TypeDecorator's incorrect usage of _impl_dict

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/sqlalchemy/engine/default.py b/lib/sqlalchemy/engine/default.py
index 5d37741bd..4b2e3b681 100644
--- a/lib/sqlalchemy/engine/default.py
+++ b/lib/sqlalchemy/engine/default.py
@@ -57,6 +57,8 @@ class DefaultDialect(base.Dialect):
     supports_default_values = False
     supports_empty_insert = True
     
+    server_version_info = None
+    
     # indicates symbol names are 
     # UPPERCASEd if they are case insensitive
     # within the database.
@@ -142,8 +144,7 @@ class DefaultDialect(base.Dialect):
         cursor.close()
         return result
         
-    @classmethod
-    def type_descriptor(cls, typeobj):
+    def type_descriptor(self, typeobj):
         """Provide a database-specific ``TypeEngine`` object, given
         the generic object which comes from the types module.
 
@@ -152,7 +153,7 @@ class DefaultDialect(base.Dialect):
         and passes on to ``types.adapt_type()``.
 
         """
-        return sqltypes.adapt_type(typeobj, cls.colspecs)
+        return sqltypes.adapt_type(typeobj, self.colspecs)
 
     def reflecttable(self, connection, table, include_columns):
         insp = reflection.Inspector.from_engine(connection)