#!/usr/bin/env python
# -*- coding:utf-8 -*-
# by wk
import os
# 格式化输出
def format_print(seled_columns, print_list):
print(*seled_columns)
print('- - - - - ' * len(seled_columns))
for p_dict in print_list:
k = 1
for sel_col in seled_columns:
if len(seled_columns) == k:
print(p_dict[sel_col], end='\n')
else:
print(p_dict[sel_col], end=' ')
k += 1
# 把文本文件转换成列表
def table_list():
my_table_list = []
with open('staff_table.txt', 'r', encoding='utf-8') as f:
for line in f:
line_strip = line.split(',')
# print(line_strip)
staff_dict = {
'staff_id': line_strip[0],
'name': line_strip[1],
'age': line_strip[2],
'phone': line_strip[3],
'dept': line_strip[4],
'enroll_date': line_strip[5].strip('\n')
}
my_table_list.append(staff_dict)
# print(my_table_list)
return my_table_list
# 查询模块
def select(user_sql, my_table_list):
try:
i = 0
if len(user_sql) == 4 and user_sql[3] == 'staff_table':
print_list = []
# print(my_table_list)
if user_sql[1] == '*':
seled_columns = ('staff_id', 'name', 'age', 'phone', 'dept', 'enroll_date')
else:
seled_columns = user_sql[1].split(',')
for li in my_table_list:
p_dict = {}
for col in seled_columns:
p_dict[col] = li[col]
print_list.append(p_dict)
i += 1
format_print(seled_columns, print_list)
print('%s rows in set (0.00 sec)' % i)
elif user_sql[3] == 'staff_table':
if user_sql[1] == '*':
seled_columns = ('staff_id', 'name', 'age', 'phone', 'dept', 'enroll_date')
# print(seled_columns)
else:
seled_columns = user_sql[1].split(',')
seled_compare_column = user_sql[5]
seled_compare_symbol = user_sql[6]
seled_compare_value = user_sql[7]
seled_compare_value = seled_compare_value.lstrip('"')
seled_compare_value = seled_compare_value.rstrip('"')
print_list = []
for line in my_table_list:
print_dict = {}
if seled_compare_symbol == '>':
if line[seled_compare_column] > seled_compare_value:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
elif seled_compare_symbol == '<':
if line[seled_compare_column] < seled_compare_value:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
elif seled_compare_symbol == '=':
if line[seled_compare_column] == seled_compare_value:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
elif seled_compare_symbol == '>=':
if line[seled_compare_column] >= seled_compare_value:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
elif seled_compare_symbol == '<=':
if line[seled_compare_column] <= seled_compare_value:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
elif seled_compare_symbol == 'like':
if seled_compare_value in line[seled_compare_column]:
for column in seled_columns:
print_dict[column] = line[column]
print_list.append(print_dict)
i += 1
else:
print('incorrect syntax!')
# print(print_list)
format_print(seled_columns, print_list)
print('%s rows in set (0.00 sec)' % i)
else:
print("ERROR 1146 (42S02): Table '%s' doesn't exist" % user_sql[3])
except:
print('ERROR 1064 (42000): You have an error in your SQL syntax;')
# 添加模块
def insert(user_sql, my_table_list):
try:
# print(user_sql)
if user_sql[2] == 'staff_table':
flag = True
insert_value_formate = []
insert_value = user_sql[4]
insert_value = insert_value.lstrip('(')
insert_value = insert_value.rstrip(')')
insert_value = insert_value.split(',')
# print('insert_value: ', insert_value)
for v in insert_value:
insert_value_formate.append(v.strip("'"))
# print('insert_value_formate: ',insert_value_formate)
# print(type(insert_value))
staff_id_list = []
insert_staff = {}
# print(my_table_list)
for my_col in my_table_list:
if my_col['phone'] == insert_value_formate[2]:
duplicate_key = my_col['phone']
flag = False
else:
staff_id_list.append(int(my_col['staff_id']))
if flag:
staff_id_new = int(max(staff_id_list)) + 1
# print('dasdasd',staff_id_new)
insert_staff['staff_id'] = str(staff_id_new)
insert_staff['name'] = insert_value_formate[0]
insert_staff['age'] = insert_value_formate[1]
insert_staff['phone'] = insert_value_formate[2]
insert_staff['dept'] = insert_value_formate[3]
insert_staff['enroll_date'] = insert_value_formate[4]
# print('insert_staff: ', insert_staff)
my_table_list.append(insert_staff)
# print('my_table_list: ', my_table_list)
cope_file(my_table_list)
print('Query OK, 1 row affected (0.01 sec)')
else:
print("ERROR 1062 (23000): Duplicate entry '%s' for key 'PRIMARY'" % duplicate_key)
else:
print("ERROR 1146 (42S02): Table '%s' doesn't exist" % user_sql[2])
except:
print('ERROR 1064 (42000): You have an error in your SQL syntax;')
# 更新模块
def update(user_sql, my_table_list):
try:
# print(user_sql)
if user_sql[1] == 'staff_table':
update_list = []
count = 0
seled_compare_value = user_sql[9]
seled_compare_value = seled_compare_value.lstrip('"')
seled_compare_value = seled_compare_value.rstrip('"')
seled_change_value = user_sql[5]
seled_change_value = seled_change_value.lstrip('"')
seled_change_value = seled_change_value.rstrip('"')
for my_table_dict in my_table_list:
if seled_compare_value == my_table_dict[user_sql[7]]:
my_table_dict[user_sql[7]] = seled_change_value
count += 1
update_list.append(my_table_dict)
cope_file(update_list)
print('Query OK, %s row affected (0.02 sec)\nRows matched: %s Changed: %s Warnings: 0' % (
count, count, count))
else:
print("ERROR 1146 (42S02): Table '%s' doesn't exist" % user_sql[1])
except:
print('ERROR 1064 (42000): You have an error in your SQL syntax;')
# 删除模块
def delete(user_sql, my_table_list):
try:
if user_sql[2] == 'staff_table':
# print('aaaa',my_table_list)
flag = False
del_list = []
for my_col in my_table_list:
if my_col[user_sql[4]] == user_sql[6]:
# print('this is user_sql[4]',user_sql[4],type(user_sql[4]))
flag = True
continue
else:
del_list.append(my_col)
if flag:
cope_file(del_list)
print('Query OK, 1 row affected (0.02 sec)')
else:
cope_file(del_list)
print('error! no data effect!')
else:
print("ERROR 1146 (42S02): Table '%s' doesn't exist" % user_sql[2])
except:
print('ERROR 1064 (42000): You have an error in your SQL syntax;')
# 把列表转换成文本文件
def cope_file(staff_list):
with open('staff_table_new.txt', 'w', encoding='utf8') as f:
for staff_colunm_dict in staff_list:
f.write(staff_colunm_dict['staff_id'] + ',' \
+ staff_colunm_dict['name'] + ',' \
+ staff_colunm_dict['age'] + ',' \
+ staff_colunm_dict['phone'] + ',' \
+ staff_colunm_dict['dept'] + ',' \
+ staff_colunm_dict['enroll_date'] + '\n')
os.remove('staff_table.txt')
os.rename('staff_table_new.txt', 'staff_table.txt')
# 主调度模块
def main():
cmd_dic = {
'select': select,
'insert': insert,
'update': update,
'delete': delete,
}
print('''
Welcome to the WKSQL monitor.
''')
while True:
staff_list = table_list()
# sql = select * from userlist;
sql = input('(root@localhost [staff_db]) ').strip()
if not sql:
continue
cmd_info = sql.split()
cmd = cmd_info[0].lower()
cmd_last = cmd_info[-1]
str_list = list(cmd_last)
if sql == 'exit':
print('Bye')
break
if str_list[-1] == ';': # 去除;号
str_list.pop()
cmd_info[-1] = ''.join(str_list)
if cmd in cmd_dic:
cmd_dic[cmd](cmd_info, staff_list)
else:
print('cmd not exists')
# cope_file(staff_list)
if __name__ == '__main__': # 主程序入口
main()
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