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我正在编写一个程序来存储密码，但它似乎并没有写入数据库。当我“添加密码”时，它不会显示错误，但是当我“找到现有密码”时，我得到的只是一个空数组（即 [ ]）。请注意，由于我直到文件末尾才提交更改，所以我退出，重新加载，然后搜索现有密码。

在我的文件夹中，我已经有一个空文件“passwords.db”。

这是我的代码：

import sys
import sqlite3 as lite

con = lite.connect("passwords.db")
cur = con.cursor()

cur.execute("CREATE TABLE if not EXISTS passwords(site VARCHAR(50), username VARCHAR(20), password VARCHAR(20));")

print "Welcome to Passwords.py."

choice = None

while choice == None:
    print "What would you like to do?"
    print "1.) Add new password."
    print "2.) Find existing password."
    print "3.) Update existing password."
    print "4.) Quit."
    choice = raw_input("> ")

    if choice == "1":
        s = raw_input("Which website to add? ")
        name = raw_input("Username to add? ")
        passwd = raw_input("Password to add? ")

        cur.execute("INSERT INTO passwords VALUES (?,?,?)", (s,name,passwd))

        choice = None

    elif choice == "2":
        s = raw_input("Find info for which website? ")

        cur.execute("SELECT * FROM passwords WHERE site=?", (s,))

        print cur.fetchall()

        choice = None

    elif choice == "3":
        s = raw_input("Update info for which website? ")
        name = raw_input("New username? ")
        passwd = raw_input("New password? ")

        cur.execute("UPDATE passwords SET username, password WHERE site=?", (s,))

        choice = None

    elif choice == "4":
        quit()

    else:
        print "Enter 1, 2, or 3."
        choice = None

### cleaning up.

if con:
    con.commit()
    con.close()

违规程序：

laura@laura-AO722:~/Desktop/passwords$ python passwords.py
Welcome to Passwords.py.
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 1
Which website to add? a
Username to add? b
Password to add? c
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 4
laura@laura-AO722:~/Desktop/passwords$ python passwords.py
Welcome to Passwords.py.
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 2
Find info for which website? a
[]
4

1 回答 1

1

您的更新 SQL 应如下所示

cur.execute("UPDATE passwords SET username=?, password=? WHERE site=?", (name, passwd, s,))

这是我得到的输出

>>> 
Welcome to Passwords.py.
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 1
Which website to add? google.com
Username to add? john
Password to add? pass
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 2
Find info for which website? google.com
[(u'google.com', u'john', u'pass')]
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 3
Update info for which website? google.com
New username? john2
New password? pass2
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
> 2
Find info for which website? google.com
[(u'google.com', u'john2', u'pass2')]
What would you like to do?
1.) Add new password.
2.) Find existing password.
3.) Update existing password.
4.) Quit.
>
于 2013-06-24T23:17:28.527 回答