路飞学城Python-Day10(practise)

'''
作业：
现要求你写一个简单的员工信息增删该查程序，需求如下：
当然此表在文件存储时可以这样表示
1,Alex Li,22,13651054608,IT,2013-04-01
2,Jack Wang,28,13451024608,HR,2015-01-07
3,Rain Wang,21,13451054608,IT,2017-04-01
4,Mack Qiao,44,15653354208,Sales,2016-02-01
5,Rachel Chen,23,13351024606,IT,2013-03-16
6,Eric Liu,19,18531054602,Marketing,2012-12-01
7,Chao Zhang,21,13235324334,Administration,2011-08-08
8,Kevin Chen,22,13151054603,Sales,2013-04-01
9,Shit Wen,20,13351024602,IT,2017-07-03
10,Shanshan Du,26,13698424612,Operation,2017-07-02
1.可进行模糊查询，语法至少支持下面3种查询语法:
find name,age from staff_table where age > 22
find * from staff_table where dept = "IT"
find * from staff_table where enroll_date like "2013"
2.可创建新员工纪录，以phone做唯一键(即不允许表里有手机号重复的情况)，staff_id需自增
语法: add staff_table Alex Li,25,134435344,IT,2015-10-29
3.可删除指定员工信息纪录，输入员工id，即可删除
语法: del from staff_table where  id=3
4.可修改员工信息，语法如下:
UPDATE staff_table SET dept="Market" WHERE  dept = "IT" 把所有dept=IT的纪录的dept改成Market
UPDATE staff_table SET age=25 WHERE  name = "Alex Li"  把name=Alex Li的纪录的年龄改成25
5.以上每条语名执行完毕后，要显示这条语句影响了多少条纪录。 比如查询语句 就显示 查询出了多少条、修改语句就显示修改了多少条等
'''
import os
import json


def create_staff_table():
    '''
    如果表存在就加载表，不存在就创建信息表
    :return:
    '''
    msg = [
        '1,Alex Li,22,13651054608,IT,2013-04-01',
        '2,Jack Wang,28,13451024608,HR,2015-01-07',
        '3,Rain Wang,21,13451054608,IT,2017-04-01',
        '4,Mack Qiao,44,15653354208,Sales,2016-02-01',
        '5,Rachel Chen,23,13351024606,IT,2013-03-16',
        '6,Eric Liu,19,18531054602,Marketing,2012-12-01',
        '7,Chao Zhang,21,13235324334,Administration,2011-08-08',
        '8,Kevin Chen,22,13151054603,Sales,2013-04-01',
        '9,Shit Wen,20,13351024602,IT,2017-07-03',
        '10,Shanshan Du,26,13698424612,Operation,2017-07-02',

    ]
    if not os.path.isfile('staff_table'):
        with open('staff_table','w',encoding='utf-8') as f:
            for i in msg:f.write(i+'\n')
    else:
        with open('staff_table', 'r', encoding='utf-8') as f:print(f.read())


create_staff_table()