day12 python作业:员工信息表

淩亂°似流年 2022-01-09 09:45 227阅读 0赞

## 作业要求: ##

周末大作业：实现员工信息表  
文件存储格式如下：  
id，name，age，phone，job  
1,Alex,22,13651054608,IT  
2,Egon,23,13304320533,Tearcher  
3,nezha,25,1333235322,IT

现在需要对这个员工信息文件进行增删改查。不允许一次性将文件中的行都读入内存。

基础必做：

a.可以进行查询，支持三种语法：*select 列名1，列名2，… where 列名条件,  **支持：大于小于等于，还要支持模糊查找。*

*示例：  
select name, age where age>22  
select \* where job=IT  
select \* where phone like 133*

进阶选做：  
b.可创建新员工记录，id要顺序增加  
c.可删除指定员工记录，直接输入员工id即可  
d.修改员工信息  
语法：set 列名=“新的值” where 条件  
\#先用where查找对应人的信息，再使用set来修改列名对应的值为“新的值”

注意：要想操作员工信息表，必须先登录，登陆认证需要用装饰器完成.*其他需求尽量用函数实现*

## *作业代码:* ##

*自己鼓捣大半天,把查询功能实现了,代码没有进行优化,回头再优化代码完成进阶要求.*

FLAG = False
    def wrapper(func):
        def inner(*args,**kwargs):
            global FLAG
            '''登录程序'''
            if FLAG:
                ret = func(*args,**kwargs)
                return ret
            else:
                username = input('username:')
                password = input('password:')
                if username == 'pengzhaoyang' and password == '123456':
                    FLAG = True
                    ret = func(*args,**kwargs)
                    return ret
                else:
                    print('登录失败')
        return inner
    
    @wrapper
    def dayu():
        keys = vkey[0].split(',')
        sele = vkey[1].split(">")
        with open('message','r',encoding='utf-8') as f:
            for line in f:
                lis = line.strip().split(',')
                dic = {}
                s = ''
                for i in range(len(lis)):
                    dic[doc[i]] = lis[i]
                if int(dic[sele[0]]) > int(sele[1]):
                    if keys[0] != '*':
                        for key in keys:
                            s += dic[key] + ','
                    else:
                        s = line.strip()
                    print(s)
    
    @wrapper
    def xiaoyu():
        keys = vkey[0].split(',')
        sele = vkey[1].split("<")
        with open('message','r',encoding='utf-8') as f:
            for line in f:
                lis = line.strip().split(',')
                dic = {}
                s = ''
                for i in range(len(lis)):
                    dic[doc[i]] = lis[i]
                if int(dic[sele[0]]) < int(sele[1]):
                    if keys[0] != '*':
                        for key in keys:
                            s += dic[key] + ','
                    else:
                        s = line.strip()
                    print(s)
    
    @wrapper
    def dengyu():
        keys = vkey[0].split(',')
        sele = vkey[1].split("=")
        with open('message','r',encoding='utf-8') as f:
            for line in f:
                lis = line.strip().split(',')
                dic = {}
                s = ''
                for i in range(len(lis)):
                    dic[doc[i]] = lis[i]
                if dic[sele[0]] == sele[1]:
                    if keys[0] != '*':
                        for key in keys:
                            s += dic[key] + ','
                    else:
                        s = line.strip()
                    print(s)
    
    @wrapper
    def like():
        keys = vkey[0].split(',')
        with open('message','r',encoding='utf-8') as f:
            for line in f:
                lis = line.strip().split(',')
                dic = {}
                s = ''
                for i in range(len(lis)):
                    dic[doc[i]] = lis[i]
                if vkey[-1] in dic[vkey[1]]:
                    if keys[0] != '*':
                        for key in keys:
                            s += dic[key] + ','
                    else:
                        s = line.strip()
                    print(s)
    
    doc = ['id', 'name', 'age', 'phone', 'job']
    
    while True:
        sel = input('>>>')  # 输入查询命令
        if 'select' in sel and 'where' in sel:
            vkey = sel.split()[1::2]
            if '>' in sel:
                dayu()
            elif '<' in sel:
                xiaoyu()
            elif '=' in sel:
                dengyu()
            else:
                like()
        else:
            print('语法错误!!!')

转载于:https://www.cnblogs.com/87pzy/p/10584339.html