实现员工信息表展示功能

　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'[=><]+', where_str).group()
                where_list = re.split(r'[=><]+', where_str)
            where_field = where_list[0]
            value = where_list[1]if re.search(r'[\'\"]+', value):  # 带'和"的表示字符,处理掉'和"value = value.replace('\"', '')
                value = value.replace('\'', '')else:
                value = float(value)# print(where_str, where_field, sizeof, value)# 条件判断 >, <, =, likeif sizeof == '>':
                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 == '<':
                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 == '=':
                v = info_list[field.get(where_field)]if field.get(where_field) == 2:
                    v = float(v)if 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 == 'like':
                v = info_list[field.get(where_field)]if value in v:
                    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:passdef add(staff):
    staff.sort()
    num = int(re.split(r',', staff[-1])[0]) + 1phone = input("phone:").strip()for line in staff:if phone == line[3]:print("already exists...")return Falseif not re.match(r'^\d+$', phone) or len(phone) < 7:print("format error...")return False
    name = input("name:").strip()
    age = input("age:").strip()
    dept = input("dept:").strip()
    enroll_date = input("enroll_date:").strip()for s in (name, age, dept, enroll_date):if not len(s):print("input is null...")return Falseelse:
        staff.append('%s,%s,%s,%s,%s,%s\n' % (num, name, age, phone, dept, enroll_date))return staffdef update(staff, field):
    cmd = input("cmd>").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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