from pymysql import connect
class DBOpen(object):
	# 初始化
	def __init__(self, databasename):
		# 建立Connection連線
		self.conn = connect(host='localhost', port=3306, database=databasename, user='root', password='mysql',
		                    charset='utf8')
		# 獲得Cursor物件
		self.cs1 = self.conn.cursor()
	# 返回操作符
	def __enter__(self):
		return self.cs1
	# 退出
	def __exit__(self, exc_type, exc_val, exc_tb):
		# 關閉之前做一個統一的提交
		self.conn.commit()
		# 1.3 關閉
		self.cs1.close()
		self.conn.close()
with DBOpen("stock_db") as cs:
	cs.execute("select * from info;")
	data = cs.fetchall()
for temp in data:
	print(temp)