place docs for DBAPI-agnostic transaction_isolation setting for sqlite, pg [ticket:1784]

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/sqlalchemy/dialects/sqlite/base.py b/lib/sqlalchemy/dialects/sqlite/base.py
index ca0a39136..ec3d7b8ac 100644
--- a/lib/sqlalchemy/dialects/sqlite/base.py
+++ b/lib/sqlalchemy/dialects/sqlite/base.py
@@ -41,7 +41,15 @@ to the Table construct::
     Table('sometable', metadata,
             Column('id', Integer, primary_key=True), 
             sqlite_autoincrement=True)
-    
+
+Transaction Isolation Level
+---------------------------
+
+:func:`create_engine` accepts an ``isolation_level`` parameter which results in 
+the command ``PRAGMA read_uncommitted <level>`` being invoked for every new 
+connection.   Valid values for this parameter are ``SERIALIZABLE`` and 
+``READ UNCOMMITTED`` corresponding to a value of 0 and 1, respectively.
+
 """
 
 import datetime, re, time