Nemyslím si, že to funguje pro ovladač MySQLdb; budete muset zadat samostatné dotazy:
cur = conn.cursor()
cur.execute("SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED")
cur.execute("SELECT @@session.tx_isolation")
print cur.fetchall()[0]
cur.execute("SELECT * FROM bar")
print cur.fetchall()
cur.execute("SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ")
cur.execute("SELECT @@session.tx_isolation")
print cur.fetchall()[0]
# output
('READ-UNCOMMITTED',)
(('foo',), ('bar',))
('REPEATABLE-READ',)
Metoda execute() kurzoru MySQLdb vidí pouze první dotaz až po středník:
cur.execute("SELECT * FROM bar WHERE thing = 'bar'; SELECT * FROM bar")
print cur.fetchall()
# output
(('bar',),)