我认为这不适用于MySQLdb驱动程序；您将不得不发出单独的查询：
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',)MySQLdb游标的execute（）方法只能看到第一个查询，直到分号为止：
cur.execute("SELECT * FROM bar WHERe thing = 'bar'; SELECt * FROM bar")print cur.fetchall()# output(('bar',),)
