python+mysql存储二进制流的方式

import MySQLdb 
 
class BlobDataTestor: 
 def __init__ (self): 
 self.conn = MySQLdb.connect(host='localhost',user='',passwd='',db='0') 
 
 def __del__ (self): 
 try: 
 self.conn.close() 
 except : 
 pass 
 
 
 def closedb(self): 
 self.conn.close() 
 
 def setup(self): 
 cursor = self.conn.cursor() 
 cursor.execute( """ 
 CREATE TABLE IF NOT EXISTS `Dem_Picture` ( 
 `ID` int(11) NOT NULL auto_increment, 
 `PicData` mediumblob, 
 PRIMARY KEY (`ID`) 
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=4 ; 
 """) 
 
 
 
 def teardown(self): 
 cursor = self.conn.cursor() 
 try: 
 cursor.execute( "Drop Table Dem_Picture" ) 
 except: 
 pass 
 # self.conn.commit() 
 
 def testRWBlobData(self): 
 # 读取源图片数据 
 f = open( "C:\11.jpg" , "rb" ) 
 b = f.read() 
 f.close() 
 
 # 将图片数据写入表 
 cursor = self.conn.cursor() 
 cursor.execute( "INSERT INTO Dem_Picture (PicData) VALUES (%s)" , (MySQLdb.Binary(b))) 
 # self.conn.commit() 
 
 # 读取表内图片数据，并写入硬盘文件 
 cursor.execute( "SELECT PicData FROM Dem_Picture ORDER BY ID DESC limit 1" ) 
 d = cursor.fetchone()[0] 
 cursor.close() 
 
 f = open( "C:\22.jpg" , "wb" ) 
 f.write(d) 
 f.close() 
 
# 下面一句的作用是：运行本程序文件时执行什么操作 
if __name__ == "__main__": 
 
 test = BlobDataTestor() 
 
 try: 
 test.setup() 
 test.testRWBlobData() 
 test.teardown() 
 finally: 
 test.closedb()