python连接mysql并提交mysql事务示例

# -*- coding: utf-8 -*-
import sys
import MySQLdb
reload(sys)
sys.setdefaultencoding('utf-8')
class DB(object):
def __init__(self,host='127.0.0.1',port=3306,user='root',passwd='123',database=''):
self.__host=host
self.__port=port
self.__user=user
self.__passwd=passwd
self.__database=database
self.__open=False
print '__init__'

def __connect__(self):
if self.__open == False:
print 'connect db...'
self.__conn = MySQLdb.connect(host=self.__host , port=self.__port , user=self.__user , passwd=self.__passwd,charset='utf8')
self.__open = True

def __executeSql__(self,sql):
self.__connect__()
self.__executor = self.__conn.cursor(cursorclass = MySQLdb.cursors.DictCursor)
self.__executor.execute('use '+self.__database) #切换数据库
return self.__executor.execute(sql)

def executeQueryForObject(self , sql):
self.__executeSql__(sql)
return self.__executor.fetchone()

'''
返回key=value 字典
'''
def executeQueryAll(self , sql):
self.__executeSql__(sql)
return self.__executor.fetchall()

def executeUpdate(self ,sql='' , isAutoCommit=False):
c = self.__executeSql__(sql)
if isAutoCommit == True:
self.commit() #提交事务
return c
'''
#提交事务
'''
def commit(self):
self.__conn.commit() #提交事务

'''
#关闭数据库，释放资源
'''
def closeDB(self):
if not self.__conn is None:
print 'close db...'
self.__conn.commit() #提交事务
self.__conn.close()

def print_parameters(self):
print self.__user
print self.__passwd
print self.__host
print self.__port
'''
if __name__ == '__main__':
db=DB(database='tb2013')
#db.print_parameters()
#db.executeSql('select * from tb_user')
print db.executeQueryForObject('select count(*) as count from tb_user')
_rows = db.executeQueryAll('select userid,nick from tb_user limit 10');
print _rows
for row in _rows:
print row
print 'nick:%s' % str(row['nick'])
print db.executeUpdate(sql='update tb_user set nick=\'test\' where userid=95084397',isAutoCommit=True)
db.closeDB()
'''