Release Notes: A bug was fixed in which ConnectionPool.runQuery() and runInteraction() were broken by the removal of ConnectionPool._error() in 2.0.
Release Notes: Error handling was improved, query formatting is more flexible, boolean support was added, experimental Unicode support was implemented, Unix socket support was added, and many bugs were fixed.
Release Notes: Circular references and memory leaks were resolved, and an error that occurred when the same errback was called twice from runOperation was fixed.
Release Notes: Connection pool size control was added.
Release Notes: Transaction and ConnectionPool were added for adbapi compatibility. A bug in the protocol layer that caused a stale transactional state flag during callback was fixed.