python之MySQL学习——简单的增删改查封装

Posted 2020-09-27

1.增删改查封装类MysqlHelper.py

 1 import pymysql as ps
 2 
 3 class MysqlHelper:
 4     def __init__(self, host, user, password, database, charset):
 5         self.host = host
 6         self.user = user
 7         self.password = password
 8         self.database = database
 9         self.charset = charset
10         self.db = None
11         self.curs = None
12     # 数据库连接
13     def open(self):
14         self.db = ps.connect(host=self.host, user=self.user, password=self.password,database=self.database, charset=self.charset)
15         self.curs = self.db.cursor()
16     # 数据库关闭
17     def close(self):
18         self.curs.close()
19         self.db.close()
20     # 数据增删改
21     def cud(self, sql, params):
22         self.open()
23         try:
24             self.curs.execute(sql, params)
25             self.db.commit()
26             print("ok")
27         except :
28             print(‘cud出现错误‘)
29             self.db.rollback()
30         self.close()
31     # 数据查询
32     def find(self, sql, params):
33         self.open()
34         try:
35             result = self.curs.execute(sql, params)
36             self.close()
37             print("ok")
38             return result
39         except:
40             print(‘find出现错误‘)

2.数据查询（引入封装类）

1 from MysqlHelper import MysqlHelper
2 
3 mh = MysqlHelper(‘localhost‘, ‘root‘, ‘123456‘, ‘test‘, ‘utf8‘)
4 sql = "select * from user where name=%s"
5 print(mh.find(sql, ‘小明‘))

3.数据修改（引入封装类）

1 from MysqlHelper import MysqlHelper
2 
3 mh = MysqlHelper(‘localhost‘, ‘root‘, ‘123456‘, ‘test‘, ‘utf8‘)
4 sql = "insert into user(name,password) values(%s,%s)"
5 mh.cud(sql, (‘小光‘, ‘123456‘))