Python数据操作方法封装类实例

#!/usr/bin/env python# -*- coding:utf-8 -*-# Author:Eric.yueimport loggingimport MySQLdbclass _MySQL(object):  def __init__(self,host, port, user, passwd, db):    self.conn = MySQLdb.connect(      host = host,      port = port,      user = user,      passwd = passwd,      db = db,      charset='utf8'    )  def get_cursor(self):    return self.conn.cursor()  def query(self, sql):    cursor = self.get_cursor()    try:      cursor.execute(sql, None)      result = cursor.fetchall()    except Exception, e:      logging.error("mysql query error: %s", e)      return None    finally:      cursor.close()    return result  def execute(self, sql, param=None):    cursor = self.get_cursor()    try:      cursor.execute(sql, param)      self.conn.commit()      affected_row = cursor.rowcount    except Exception, e:      logging.error("mysql execute error: %s", e)      return 0    finally:      cursor.close()    return affected_row  def executemany(self, sql, params=None):    cursor = self.get_cursor()    try:      cursor.executemany(sql, params)      self.conn.commit()      affected_rows = cursor.rowcount    except Exception, e:      logging.error("mysql executemany error: %s", e)      return 0    finally:      cursor.close()    return affected_rows  def close(self):    try:      self.conn.close()    except:      pass  def __del__(self):    self.close()mysql = _MySQL('127.0.0.1', 3306, 'root', '123456', 'test')def create_table():  table = """      CREATE TABLE IF NOT EXISTS `watchdog`(        `id` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,        `name` varchar(100),        `price` int(11) NOT NULL DEFAULT 0      ) ENGINE=InnoDB charset=utf8;      """  print mysql.execute(table)def insert_data():  params = [('dog_%d' % i, i) for i in xrange(12)]  sql = "INSERT INTO `watchdog`(`name`,`price`) VALUES(%s,%s);"  print mysql.executemany(sql, params)if __name__ == '__main__':  create_table()  insert_data()