Python的SQLite的ToDo腳本

Question

我想做一個腳本，要求用戶輸入一個任務，然後將任務存儲在SQLite數據庫。我有一個問題讓我的刪除功能工作。另外，當我輸入一個新的任務，我必須封裝在引號中，以使其運行。

import sqlite3 
import sys 

con = sqlite3.connect('taskmgr.db') 

def create_db(): 
    with con: 
     c.execute("DROP TABLE IF EXISTS ToDo") 
     c.execute("CREATE TABLE ToDo(Id int, Task char20, Due char20)") 

def select_task(): 
    with con: 
     cursor = con.execute("SELECT Id, Task, Due from ToDo") 
     for row in cursor: 
      print "Id:" ,row[0] 
      print "Task:" ,row[1] 
      print "Due:" ,row[2] 

def insert_task(): 
    with con: 
     print("New Task\n") 
     Id = input("Enter Id: ") 
     Task = input("Enter Task: ") 
     Due = input("Enter Due Date: ") 
     c.execute("INSERT INTO ToDo VALUES(?, ?, ?)", (Id, Task, Due)) 
     con.commit() 

def delete_record(): 
    with con: 
     print("Enter task Id to delete:") 
     user = int(input()) 
     c.execute("DELETE FROM ToDo WHERE Id=?",(user)) 

c = con.cursor()   
create_db() 

target= int(8) 
while target != 9: 
    target=int(input("\nGood Morning Curtis!\n \nSelect option:\n 1.New Task\n 2.Select Task\n 3.Delete Task\n 9.Quit\n\nUser: ")) 

    if target ==1: 
     insert_task() 

    elif target ==2: 
     select_task() 

    elif target ==3: 
     delete_record() 

    elif target ==9: 
     print("good bye") 

Answer 1

關於需要報價輸入，用於Python 2使用raw_input()代替input()。

另一個問題是與execute語句，具體而言，參數化查詢的值需要是類型元組（或列表），但是，您傳遞一個整數值。嘗試將其更改爲這樣：

c.execute("DELETE FROM ToDo WHERE Id=?",(user,)) 

的原因是包裹在括號中有一個值不會創建一個元組：

>>> for user in 1, (1), (1,): 
...  print user, type(user) 
... 
1 <type 'int'> 
1 <type 'int'> 
(1,) <type 'tuple'> 

從上面可以看出，(1)仍然1，是鍵入int。包裝它在()沒有將其轉換爲元組。但是，(1,)是一個元組。或者，你可以傳遞參數列表，例如

c.execute("DELETE FROM ToDo WHERE Id=?",[user])