python+MySQLdb实现二进制图片的写库及读出
#!/usr/bin/python
#coding=utf-8
import MySQLdb
class BlobDataTestor:
def __init__ (self):
self.conn = MySQLdb.connect(host='localhost',user='<your user>',passwd='<your pw>',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()
cursor.close()
f = open( "C:\\22.jpg" , "wb" )
f.write(d)
f.close()
if __name__ == "__main__":
test = BlobDataTestor()
try:
test.setup()
test.testRWBlobData()
test.teardown()
finally:
test.closedb()
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