readme：
1. 员工信息表程序，实现增删改查操作：
1).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"
最后显示有查到的条数
2).可创建新员工纪录，以phone做唯一键，staff_id需自增
3).可删除指定员工信息纪录，输入员工id，即可删除
4).可修改员工信息，语法如下:
UPDATE staff_table SET dept="Market" WHERE dept = "IT"
流程图：
代码：
# coding:utf8import sysimport redef select(staff, field):
cmd = input("cmd>").strip()
cmd = cmd.replace('FROM', 'from')
cmd = cmd.replace('WHERE', 'where')if '*' in cmd:for i in field.keys():
sys.stdout.write(str(i) + ' ')print('')for line in staff:
info_list = re.split(r',+', line.strip('\n'))
cmd_list = re.split(r'[ ,;]+', cmd)
f_index = cmd_list.index('from')
search_field = cmd_list[1:f_index]
from_field = cmd_list[f_index + 1]if from_field != 'staff_table':print('\033[31;1mplease select `staff_table`...\033[0m')breakif 'where' not in cmd_list:# 不存在where条件，显示所有view_list = []for i in range(len(search_field)):if search_field[i] == '*':
view_list = info_list[:]else:
view_list.append(info_list[field.get(search_field[i])])else:print(','.join(view_list))else:# 存在where条件w_index = cmd_list.index('where')
where_str = ''.join(cmd_list[w_index + 1:])if re.search(r'like', where_str):
sizeof = 'like'where_list = re.split(r'like', where_str)else:
sizeof = re.search(r'[=>, ':
v = info_list[field.get(where_field)]if float(v) > value:
view_list = []for i in range(len(search_field)):if search_field[i] == '*':
view_list = info_list[:]else:
view_list.append(info_list[field.get(search_field[i])])else:print(','.join(view_list))elif sizeof == '").strip()
up_list = []
cmd = cmd.replace('SET', 'set')
cmd = cmd.replace('WHERE', 'where')for line in staff:
info_list = re.split(r',+', line.strip('\n'))
cmd_list = re.split(r'[ ,;]+', cmd)if cmd_list[1] != 'staff_table':print('\033[31;1mplease update `staff_table`...\033[0m')breakset_index = cmd_list.index('set')
where_index = cmd_list.index('where')
set_list = re.split(r'=', ''.join(cmd_list[set_index + 1:where_index]))
set_field = set_list[0]
set_value = set_list[1]if re.search(r'[\'\"]+', set_value):
set_value = set_value.replace('\'', '')
set_value = set_value.replace('\"', '')
where_list = re.split(r'=', ''.join(cmd_list[where_index + 1:]))
where_field = where_list[0]
where_value = where_list[1]if re.search(r'[\'\"]+', where_value):
where_value = where_value.replace('\'', '')
where_value = where_value.replace('\"', '')if info_list[field.get(where_field)] == where_value:
info_list[field.get(set_field)] = set_valueprint(','.join(info_list))
up_list.append(','.join(info_list))else:return up_listdef delete(staff):
del_id = input("delete id:").strip()for i in range(len(staff)):if re.split(r',', staff[i])[0] == del_id:
staff.pop(i)print("id:%s delete success." % del_id)return staffelse:return Falsedef main():
staff_table = 'staff_table.txt'field = {'staff_id': 0,'name': 1,'age': 2,'phone': 3,'dept': 4,'enroll_date': 5}
menu = '''\033[33;1m-- staff_table --\033[0m\033[29;1m
S. 查询 h. 帮助
A. 新增 q. 退出
E. 修改
D. 删除\033[0m'''print(menu)while True:try:
with open(staff_table, 'r') as f:
staff = f.readlines()
choice = input(">>").strip().lower()if choice == 'h': # helpprint(menu)elif choice == 'q':breakelif choice == 's': # search select(staff, field)elif choice == 'a': # addresult = add(staff)if not result:print('\033[31;1madd failed...\033[0m')continueelse:
with open(staff_table, 'w') as f:
f.writelines(result)elif choice == 'e': # updateresult = update(staff, field)if not result:print('\033[31;1mupdate failed...\033[0m')continueelse:
with open(staff_table, 'w') as f:for line in result:
f.write(line + '\n')elif choice == 'd': # deleteresult = delete(staff)if not result:print('\033[31;1mdelete failed...\033[0m')continueelse:
with open(staff_table, 'w') as f:
f.writelines(result)else:continueexcept:print("\033[31;1minput error...\033[0m")continueif __name__ == '__main__':
main()
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