python之MySQL学习——简单的增删改查封装

1.增删改查封装类MysqlHelper.py

 import pymysql as ps

 class MysqlHelper:
     def __init__(self, host, user, password, database, charset):
         self.host = host
         self.user = user
         self.password = password
         self.database = database
         self.charset = charset
         self.db = None
         self.curs = None
     # 数据库连接
     def open(self):
         self.db = ps.connect(host=self.host, user=self.user, password=self.password,database=self.database, charset=self.charset)
         self.curs = self.db.cursor()
     # 数据库关闭
     def close(self):
         self.curs.close()
         self.db.close()
     # 数据增删改
     def cud(self, sql, params):
         self.open()
         try:
             self.curs.execute(sql, params)
             self.db.commit()
             print("ok")
         except :
             print('cud出现错误')
             self.db.rollback()
         self.close()
     # 数据查询
     def find(self, sql, params):
         self.open()
         try:
             result = self.curs.execute(sql, params)
             self.close()
             print("ok")
             return result
         except:
             print('find出现错误')

2.数据查询（引入封装类）

 from MysqlHelper import MysqlHelper

 mh = MysqlHelper('localhost', 'root', '', 'test', 'utf8')
 sql = "select * from user where name=%s"
 print(mh.find(sql, '小明'))

3.数据修改（引入封装类）

 from MysqlHelper import MysqlHelper

 mh = MysqlHelper('localhost', 'root', '', 'test', 'utf8')
 sql = "insert into user(name,password) values(%s,%s)"
 mh.cud(sql, ('小光', ''))