[英]ValueError: Could not process parameters in Python/MySQL
i am a newbie 我是新手
I want to prevent the duplicate usernames every time people do registration. 我想在每次人们注册时阻止重复的用户名。
Here is my snipped code: 这是我的剪辑代码:
def submit(self):
username_info = username.get()
username_password = password.get()
#connect to db
db = mysql.connector.connect(host = 'localhost', user = 'root', password = '', database = 'user')
#create a cursor
mycursor = db.cursor()
#insert to db
sql = ("INSERT INTO useraccess (user_type, password) VALUES (%s, %s)")
query = (username_info, username_password)
mycursor.execute(sql, query)
#commit
db.commit()
#create a messagebox
messagebox.showinfo("Registration", "Successfully Register")
#if username has been used
find_user = ("SELECT * FROM useraccess WHERE user_type = ?")
user_query = (username_info)
mycursor.execute(find_user, user_query)
#if (username == username_info):
if mycursor.fetchall():
messagebox.showerror("Registration", "The username chosen is already used. Please select another username")
else:
messagebox.showinfo("Registration", "Account Created!")
But every time I run it, although the username has been registered in the db, it only shows the successfully created messagebox and error: 但是每次运行它时,虽然用户名已经在db中注册,但它只显示成功创建的消息框和错误:
ValueError: Could not process parameters.
ValueError:无法处理参数。
Anyone can help me to solve this problem? 有人可以帮我解决这个问题吗?
I believe the source of the problem is in the line 我相信问题的根源就在于此
user_query = (username_info)
It should be 它应该是
user_query = (username_info,)
The trailing comma is the syntactic difference between an expression in parentheses and a tuple . 尾随逗号是括号中的表达式和元组之间的语法差异。
Another issue with code is the query: 代码的另一个问题是查询:
find_user = ("SELECT * FROM useraccess WHERE user_type = ?")
Which should be: 应该是:
find_user = ("SELECT * FROM useraccess WHERE user_type = %s")
Have you checked these variables, 你检查过这些变量吗
username_info = username.get()
username_password = password.get()
are they in proccesable formats? 他们是否采用可执行的格式? (ie can you directly put the username.get() into user_type ?)
(即你可以直接将username.get()放入user_type吗?)
I'm not familiar with this way of passing a parameter 我不熟悉这种传递参数的方式
find_user = ("SELECT * FROM useraccess WHERE user_type = ?")
have you double checked this? 你仔细检查过这个吗? (why not the %s method?)
(为什么不是%s方法?)
also, you probably get the "Account Created!" 另外,你可能会得到“帐户创建!” because mycursor.fetchall() fails.
因为mycursor.fetchall()失败了。
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