MySQL嵌套事务所遇到的问题

mysql> select * from ceshi; 
+------+ 
| n  | 
+------+ 
|  1 | 
+------+ 
1 row in set (0.00 sec) 
 
mysql> start transaction ; 
Query OK, 0 rows affected (0.00 sec) 
 
mysql> insert into ceshi values(2); 
Query OK, 1 row affected (0.00 sec) 
 
mysql> start transaction ; 
Query OK, 0 rows affected (0.00 sec) 
 
mysql> insert into ceshi values(3); 
Query OK, 1 row affected (0.00 sec) 
 
mysql> commit; 
Query OK, 0 rows affected (0.00 sec) 
 
mysql> rollback; 
Query OK, 0 rows affected (0.00 sec) 

+-----+ 
| n   | 
+-----+ 
|  1 | 
|  2 | 
|  3 | 
+-----+ 

@decorator
def with_transaction(f, *args, **kwargs):
 
  db = connection.get_db_by_table("*")
  try:
    db.begin()
    ret = f(*args, **kwargs)
    db.commit()
  except:
    db.rollback()
    raise
  return ret
 
 
@with_transaction
def hide(self):
  '''订单不在app端显示'''
  if self.status not in OrderStatus.allow_deletion_statuses():
    raise OrderStatusChangeNotAllowed(self.status, OrderStatus.deleted)
...
 
 
@with_transaction
def change_receipt_info(self, address, name, phone):
  region = Region.get_by_address(address)
  ...

ALTER FUNCTION  
ALTER PROCEDURE  
ALTER TABLE  
BEGIN  
CREATE DATABASE  
CREATE FUNCTION  
CREATE INDEX  
CREATE PROCEDURE  
CREATE TABLE  
DROP DATABASE  
DROP FUNCTION  
DROP INDEX  
DROP PROCEDURE  
DROP TABLE  
UNLOCK TABLES  
LOAD MASTER DATA  
LOCK TABLES  
RENAME TABLE  
TRUNCATE TABLE  
SET AUTOCOMMIT=1  
START TRANSACTION