tweaks

doc/build/changelog/changelog_08.rst

@@ -13,7 +13,7 @@
 
       Added a new method :meth:`.Engine.execution_options`
       to :class:`.Engine`.  This method works similarly to
-      :class:`.Connection.execution_options` in that it creates
+      :meth:`.Connection.execution_options` in that it creates
       a copy of the parent object which will refer to the new
       set of options.   The method can be used to build
       sharding schemes where each engine shares the same

lib/sqlalchemy/engine/base.py

@@ -1396,7 +1396,7 @@ class Engine(Connectable, log.Identified):
                 current_shard = conn.info.get("current_shard", None)
 
                 if current_shard != shard_id:
-                    cursor.execute("use %%s" %% shards[shard_id])
+                    cursor.execute("use %s" % shards[shard_id])
                     conn.info["current_shard"] = shard_id
 
         .. seealso::