适用于python 3+ pymsql 扩展类,包含增删改查
首先要安装pymsql , pip install pymysql

document : https://pypi.org/project/PyMySQL/
github :https://github.com/PyMySQL/PyMySQL
pipy : https://pypi.org/project/PyMySQL/

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import pymysql
import time

class MySQL:

  error_code = '' #MySQL错误号码

  _instance = None #本类的实例
  _conn = None # 数据库conn
  _cur = None #游标

  _TIMEOUT = 30 #默认超时30秒
  _timecount = 0
  dbconfig = {'host': '',
     'port': 3306,
     'user': '',
     'passwd': '',
     'db': '',
     'charset': 'utf8'}

  def __init__(self):
    self._conn = pymysql.connect(host=self.dbconfig['host'],
                     port=self.dbconfig['port'],
                     user=self.dbconfig['user'],
                     passwd=self.dbconfig['passwd'],
                     db=self.dbconfig['db'],
                     charset=self.dbconfig['charset'])

    self._cur = self._conn.cursor()
    self._instance = pymysql

  def query(self,sql,str=''):
      self._cur.execute("SET NAMES utf8")
      if (str != ''):
        return self._cur.execute(sql,str)
      else:
          return self._cur.execute(sql)

  def update(self,sql,str=''):
    try:
      self._cur.execute("SET NAMES utf8")
      result = self._cur.execute(sql,str)
      self._conn.commit()
    except Exception :print("发生异常")
    return result

  def insert(self,sql,str=''):
      self._cur.execute("SET NAMES utf8")
      self._cur.execute(sql,str)
      self._conn.commit()
      return self._cur.lastrowid

  def fetchAllRows(self):
    return self._cur.fetchall()

  def fetchOneRow(self):
    return self._cur.fetchone()

  def getRowCount(self):
    return self._cur.rowcount

  def commit(self):
    self._conn.commit()

  def rollback(self):
    self._conn.rollback()

  def __del__(self):
    try:
      self._cur.close()
      self._conn.close()
    except:
      pass

  def  close(self):
    self.__del__()

if __name__ == '__main__':
  # 连接数据库,创建这个类的实例
  db = MySQL()

  db.query("SELECT id FROM table WHERE title=%s" ,('搜索词'))
  if (db.getRowCount()):
    print('查到了')
  else:
    print('未查到')
  # 操作数据库
  insert_id = db.insert("insert into table(title,name) values(%s,%s)",('lalala','pitter'))
  print(insert_id)

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