Python3 -- PySQL -- 将函数封装在类中

------------------ comm_functions.py ------------

import pymysql

class common_functions(object):

　　# ---- 需要初始化 __init__ 来连接数据库，并产生 self.cur 供后面函数应用
    def __init__(self):
        self.conn = pymysql.connect(
            host='192.168.68.189',
            port=3307,
            user='xxxxx',
            passwd='xxxx',
            db='xxxx',
        )
        self.cur = self.conn.cursor()

    def execute_sqlscript_fetchall_contents(self, sqlscript):
        self.cur.execute(sqlscript)
        contents = self.cur.fetchall()
        return contents

    def execute_sqlscript_fetchall_content(self, sqlscript):
        contents = self.execute_sqlscript_fetchall_contents(sqlscript)
        for row in contents:
                data = row[0]
        return data

    def calculate_sharecycle(self, open_time, clean_time):
        sql_sharecycle = "select count(*) from hd_trading_date where open_day >= left(" + open_time + ", 8) and open_day <= left(" + clean_time + ",8)"
        sharecycle = self.execute_sqlscript_fetchall_content(sql_sharecycle)
        if open_time[8:12] >= "2100":
            sharecycle = sharecycle - 1
        if clean_time[3][8:12] >= "2100":
            sharecycle = sharecycle + 1


------- gen_report.py ----------

import sys
sys.path.append("./sqldata")
from com_functions import common_functions


def get_data():
        sharecycle = common_functions().calculate_sharecycle("20171018143914", "20171018210220")
        print("sharecycle: %d" % sharecycle)

if __name__ == "__main__":
    get_data()
    common_functions().close_sql()