原文件（数据已经脱敏）：
staff_id,name,age,phone,dept,enroll_date1,姬建明,25,152015410,运维,2013-11-012,刘海龙,26,186184177,运维,2012-12-253,闫培飞,25,157016802,IT,2015-10-144,孙海涛,33,158206312,IT,2005-09-275,张亚磊,24,137338110,IT,2014-06-236,张松,26,136837094,IT,2013-10-087,刘文剑,25,155550213,SA,2014-05-218,魏曼,18,189108670,运维,2014-05-219,宋晓楠,18,110168082,测试,2014-05-2110,吴东杭,21,177108908,运维,1995-08-2911,李静,18,186127011,测试,2015-08-2012,文鑫,23,181805410,无,2016-7-3113,于洪林,31,133232639,运维,2013-6-2414,王新凯,22,169965127,运维,2015-10-3115,盖爽,18,185003763,运维,2015-10-2816,张振兴,27,135214320,运维,2015-10-2817,侯梓煜,21,186819511,运维,2016-10-3118,张玉新,27,101241184,运维,2015-10-2819,纪冠宇,24,150113743,运维,2015-11-1220,李乾龙,24,185105376,运维,2015-7-1321,杨洋,21,188131922,运维,2015-1-122,张泽伟,27,101029861,无,2011-2-1 如下是要求：
# 有以下员工信息表staff_table# 1, AlexLi, 22, 13651054608, IT, 2013-04-01# 现需要对这个员工信息文件，实现增删改查操作# 可进行模糊查询，语法至少支持下面3种:# select name, age from staff_table where age > 22# select * from staff_table where dept = "IT"# select * from staff_table where enroll_date like "2013"# 查到的信息，打印后，最后面还要显示查到的条数# 可创建新员工纪录，以phone做唯一键，staff_id需自增# 可删除指定员工信息纪录，输入员工id，即可删除# 可修改员工信息，语法如下:# UPDATE staff_table SET dept = "Market" where dept = "IT"# 注意：以上需求，要充分使用函数，请尽你的最大限度来减少重复代码！# select * from staff_table where age < 25
自己写的代码，替换和删除后续补上：
1 #查询函数
2 def select(column,term=[],symbol=[],option=[]):
3 f=open("staff_table","r",encoding="utf-8")
4 object = f.readline().strip().split(",")
5
6 #查询column为*，不带条件，比如:select * from staff_table
7 if column == "*" and not term and not symbol and not option:
8 for line in f:
9 object = line.strip().split(",")
10 print("%s %s %s %s %s %s" % (object[0], object[1], object[2], object[3], object[4], object[5]))
11 exit()
12
13 #查询column为*，带条件，比如:select * from staff_table where age > 25
14 if column == "*" and term:
15 show_list=[]
16 position = object.index(term)
17 for line in f:
18 object = line.strip().split(",")
19 if object[0].isdigit:
20 if symbol == "=":
21 if object[position] == option.strip(‘\"‘):
22 show_list.append(object)
23 elif symbol == ">":
24 if object[position] > option.strip(‘\"‘):
25 show_list.append(object)
26 elif symbol == "<":
27 if object[position] < option.strip(‘\"‘):
28 show_list.append(object)
29 elif symbol == ">=":
30 if object[position] >= option.strip(‘\"‘):
31 show_list.append(object)
32 elif symbol == "<=":
33 if object[position] <= option.strip(‘\"‘):
34 show_list.append(object)
35 elif symbol == "like":
36 if option.strip(‘\"‘) in object[position]:
37 show_list.append(object)
38 i = 0
39 for i, ele in enumerate(show_list):
40 print("%s %s %s %s %s %s" % (ele[0], ele[1], ele[2], ele[3], ele[4], ele[5]))
41 print("共%s位成员%s %s %s" % (i + 1, term, symbol, option))
42 exit()
43
44 # 查询column为自选，不带条件，比如:select name,age,dept from staff_table
45 if column != "*" and not term and not symbol and not option:
46 column = column.split(",")
47 position_list = []
48 show_list1 = []
49 show_list2 = []
50 for i in range(0,len(column)):
51 position = object.index(column[i])
52 position_list.append(position)
53 for line in f:
54 object = line.strip().split(",")
55 for i in range(0,len(position_list)):
56 show_list1.append(object[position_list[i]])
57 show_list2.append(show_list1)
58 show_list1 = []
59 for i in show_list2:
60 print(i)
61 exit()
62
63 # 查询column为自选，带条件，比如:select name,age,dept from staff_table where dept = "运维"
64 if column != "*" and term:
65 show_list=[]
66 position = object.index(term)
67 for line in f:
68 object_data = line.strip().split(",")
69 if object_data[0].isdigit:
70 if symbol == "=":
71 if object_data[position] == option.strip(‘\"‘):
72 show_list.append(object_data)
73 elif symbol == ">":
74 if object_data[position] > option.strip(‘\"‘):
75 show_list.append(object_data)
76 elif symbol == "<":
77 if object_data[position] < option.strip(‘\"‘):
78 show_list.append(object_data)
79 elif symbol == ">=":
80 if object_data[position] >= option.strip(‘\"‘):
81 show_list.append(object_data)
82 elif symbol == "<=":
83 if object_data[position] <= option.strip(‘\"‘):
84 show_list.append(object_data)
85 elif symbol == "like":
86 if option.strip(‘\"‘) in object_data[position]:
87 show_list.append(object_data)
88 column = column.split(",")
89 position_list = []
90 show_list1 = []
91 show_list2 = []
92 for i in range(0,len(column)):
93 position = object.index(column[i])
94 position_list.append(position)
95 for j in range(0,len(show_list)):
96 for i in range(0,len(position_list)):
97 show_list1.append(show_list[j][position_list[i]])
98 show_list2.append(show_list1)
99 show_list1 = []
100 for i in show_list2:
101 print(i)
102 exit()
103
104 #插入函数：
105 def insert(name,age,phone,dept,enroll_date):
106 f = open("staff_table","r",encoding="utf-8")
107 num = 0
108 for line in f:
109 object = line.strip().split(",")
110 if phone == object[3]:
111 print("手机号重复，无法插入")
112 exit()
113 num = object[0]
114 f.close()
115 num = int(num)
116 num = num + 1
117 num = str(num)
118 name = name.strip(‘\"‘)
119 age = str(age)
120 phone = str(phone)
121 dept = dept.strip(‘\"‘)
122 enroll_date = enroll_date.strip(‘\"‘)
123 new_line = "\n"+num+","+name+","+age+","+phone+","+dept+","+enroll_date
124 f = open("staff_table","a",encoding="utf8")
125 f.write(new_line)
126 f.close()
127
128
129 def update():
130 pass
131
132 def delete():
133 pass
134
135 msg = """
136 请选择：
137 1.查询
138 2.插入
139 3.更新
140 4.删除
141 5.退出
142 """
143 main_dic = {
144 "1":select,
145 "2":insert,
146 "3":update,
147 "4":delete,
148 "5":exit
149 }
150
151
152 while True:
153 f = open("staff_table","r",encoding="utf-8")
154 print("成员表如下".center(40, "*"))
155 for line in f:
156 object = line.strip().split(",")
157 print("%s %s %s %s %s %s" % (object[0],object[1],object[2],object[3],object[4],object[5]))
158 print(msg)
159 column=[]
160 term=[]
161 symbol=[]
162 option=[]
163 choice = input("what do you want :")
164 if len(choice) == 0 or choice not in main_dic:continue
165 if choice == "5":break
166 if choice == "1":
167 select_sql = input("查询语句 ：")
168 select_sql_list=select_sql.split(" ")
169 column = select_sql_list[1]
170 if len(select_sql_list) > 7:
171 term = select_sql_list[5]
172 symbol = select_sql_list[6]
173 option = select_sql_list[7]
174 main_dic["1"](column,term,symbol,option)
175 if choice == "2":
176 insert_sql = input("插入语句 ：")
177 insert_sql_list = insert_sql.split(" ")
178 # insert into staff_table values ("terry",22,13333333,"it","2013-1-1")
179 column_str = insert_sql_list[4]
180 column_list = column_str.lstrip("(").rstrip(")").split(",")
181 name = column_list[0]
182 age = column_list[1]
183 phone = column_list[2]
184 dept = column_list[3]
185 enroll_date = column_list[4]
186 main_dic["2"](name,age,phone,dept,enroll_date)
时间： 2024-08-05 23:30:00