- The execution options passed to an :class:`.Engine` either via

:paramref:`.create_engine.execution_options` or
:meth:`.Engine.update_execution_options` are not passed to the
special :class:`.Connection` used to initialize the dialect
within the "first connect" event; dialects will usually
perform their own queries in this phase, and none of the
current available  options should be applied here.  In
particular, the "autocommit" option was causing an attempt to
autocommit within this initial connect which would fail with
an AttributeError due to the non-standard state of the
:class:`.Connection`.
fixes #3200

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/sqlalchemy/engine/strategies.py b/lib/sqlalchemy/engine/strategies.py
index 38206be89..49438372b 100644
--- a/lib/sqlalchemy/engine/strategies.py
+++ b/lib/sqlalchemy/engine/strategies.py
@@ -162,6 +162,7 @@ class DefaultEngineStrategy(EngineStrategy):
             def first_connect(dbapi_connection, connection_record):
                 c = base.Connection(engine, connection=dbapi_connection,
                                     _has_events=False)
+                c._execution_options = {}
                 dialect.initialize(c)
             event.listen(pool, 'first_connect', first_connect, once=True)