- SchemaItem, SchemaType now descend from common type

SchemaEventTarget, which supplies dispatch
- the dispatch now provides before_parent_attach(),
after_parent_attach(), events which generally bound the _set_parent()
event. [ticket:2037]
- the _on_table_attach mechanism now usually uses the
event dispatch
- fixed class-level event dispatch to propagate to all subclasses, not just
immediate subclasses
- fixed class-level event unpickling to handle more involved
inheritance hierarchies, needed by the new schema event dispatch.
- ForeignKeyConstraint doesn't re-call the column attach event
on ForeignKey objects that are already associated with the correct
Column
- we still need that ImportError on mysqldb CLIENT FLAGS to support
mock DBAPIs

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/sqlalchemy/connectors/mysqldb.py b/lib/sqlalchemy/connectors/mysqldb.py
index 27a56b749..189c412a0 100644
--- a/lib/sqlalchemy/connectors/mysqldb.py
+++ b/lib/sqlalchemy/connectors/mysqldb.py
@@ -87,10 +87,13 @@ class MySQLDBConnector(Connector):
         # supports_sane_rowcount.
         client_flag = opts.get('client_flag', 0)
         if self.dbapi is not None:
-            CLIENT_FLAGS = __import__(
-                                self.dbapi.__name__ + '.constants.CLIENT'
-                                ).constants.CLIENT
-            client_flag |= CLIENT_FLAGS.FOUND_ROWS
+            try:
+                CLIENT_FLAGS = __import__(
+                                    self.dbapi.__name__ + '.constants.CLIENT'
+                                    ).constants.CLIENT
+                client_flag |= CLIENT_FLAGS.FOUND_ROWS
+            except (AttributeError, ImportError):
+                pass
             opts['client_flag'] = client_flag
         return [[], opts]