python使用上下文管理器操作数据库

with 语法用于简化资源操作的后续清除操作，是 try/finally 的替代方法，实现原理建立在上下文管理器之上

代码如下，数据库相关操作依库from pymysql import *

class DB():

def __init__(self, my_database1, my_password):

self.conn = connect(host='localhost', port=3306, database=str(my_database1), user='root', password=str(my_password),
charset='utf8')
self.cs1 = self.conn.cursor()

def __enter__(self):
return (self.cs1, self.conn)

def __exit__(self, exc_type, exc_val, exc_tb):
self.conn.close()
self.cs1.close()

with DB('jing_dong','mysql') as (db, dbcoon):
count = db.execute('''select * from goods;''')
content = db.fetchall()
print(content)
for i in range(len(content)):
print(content[i])
i += 1
db.execute('''insert into goods(name,price) values('鞋子','200');''')
dbcoon.commit()