Python数据操作方法封装类实例

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Eric.yue
import logging
import MySQLdb
class _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()