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-rw-r--r--lib/sqlalchemy/orm/session.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/session.py b/lib/sqlalchemy/orm/session.py
index 4f51d04c6..b0593ec69 100644
--- a/lib/sqlalchemy/orm/session.py
+++ b/lib/sqlalchemy/orm/session.py
@@ -508,6 +508,14 @@ class Session(object):
self.twophase = twophase
self._query_cls = query_cls
+ if autocommit:
+ if expire_on_commit and _enable_transaction_accounting:
+ util.warn("expire_on_commit=False is recommended with autocommit=True, "
+ "else excessive SELECT statements may be emitted.")
+ if autoflush:
+ util.warn("autoflush=False is recommended with autocommit=True, "
+ "else premature/excessive amounts of transaction commits may occur.")
+
if extension:
for ext in util.to_list(extension):
SessionExtension._adapt_listener(self, ext)