mysql python image 图像存储读取

最近做一些数据库调研的工作，目标是实现影像更快的入库、出库、查询，并实现并行访问等操作。

将结果总结成一个mysqlImg类。

关于mongodb的图像存储，参见http://www.cnblogs.com/bigbigtree/p/3242483.html

关于mysql&python的问题和mysql官方链接python的API总结，参见

http://www.cnblogs.com/bigbigtree/p/3246638.html

http://www.cnblogs.com/bigbigtree/archive/2013/08/08/3246718.html

http://www.cnblogs.com/bigbigtree/archive/2013/08/09/3247477.html

http://www.cnblogs.com/bigbigtree/p/3248126.html

mysqlImg代码如下，

 #coding=UTF-8
 '''
 Created on 2013-8-7
 
 @author: tree
 '''
 __metaclass__ = type
 
 import mysql.connector
 import os
 import time
 
 class mysqlImg(object):
     """mysqlImg is a class for inserting image
     """
     def __init__(self):
 
         self.__filelist=[]
         self.__config = {
                   'user':'root',
                   'password':'******',
                   'host':'localhost',
                   'database':'imgdb'}      
 
     def __dirwalk(self,dir,topdown=True):
         """traverse the documents of self.__dir and save in self.__filelist
         """
         sum=0
         self.__filelist.clear()
 
         for root,dirs,files in os.walk(dir,topdown):
             for name in files:
                 sum+=1
                 temp=os.path.join(root,name)
                 self.__filelist.append(temp)
         print(sum)      
 
     def insertImg(self,imgpath,dbname=None):
         """insert images in mysql
         """
         if dbname != None:
             self.__config['database']=dbname
 
         self.__dirwalk(imgpath)
 
         sum=0
         tStart=time.time()
 
         self.__cnx=mysql.connector.connect(**self.__config)
         cur=self.__cnx.cursor()
         cur.execute("DROP TABLE IF EXISTS pyramid")
         cur.execute("CREATE TABLE pyramid(IdImg INT(11) PRIMARY KEY AUTO_INCREMENT,\
                     NameImg VARCHAR(30),\
                     DataImg LONGBLOB NOT NULL)")
 
         try:
             for fi in self.__filelist:
                 sum+=1
                 print(sum)
                 myimg = open(fi,'rb')
                 data=myimg.read()
 
                 insertString='INSERT INTO pyramid(NameImg,DataImg) VALUES(%s,%s)'
                 args=(fi,data)
                 cur.execute(insertString,args)
                 myimg.close()
         finally:
             tEnd=time.time()
             print ("It cost %f sec" % (tEnd - tStart))
             self.__cnx.commit()
             self.__cnx.close()
 
     #get image by filename
     def getbyname(self,filename,savepath):
         """get img from mysql by NameImg
         """
         if len(filename) < 1:
             raise TypeError("filename must not be None")
         if len(savepath) < 1:
             raise TypeError("dir must be an string of directory")        
 
         self.__cnx=mysql.connector.connect(**self.__config)
         cur=self.__cnx.cursor()
 
         try:
             selectString="SELECT DataImg FROM pyramid WHERE NameImg = %s"
             cur.execute(selectString,(filename,)) 
 
             data=cur.fetchone()[0]
             imgout=open(savepath,'wb')
             imgout.write(data)
         finally:
             self.__cnx.close()
             imgout.close()