使用sqlite3更新python中的数据库错误

Question

I'm trying to do a function that updates a database through a form but I'm getting this error: ValueError: operation parameter must be str .

I have no problem with other functions like delete, read or insert and I don´t know how to fix this problem. I put down two versions of function update and respective errors.

I'm trying this:

def actualizaDatos():

    Id1 = clave.get()
    nombre1 = nombre.get()
    password1 = password.get()
    apellido1 = apellido.get()
    direccion1 = direccion.get()
    comentarios1 = comentarios.get()


    sentencia="UPDATE DATOSUSUARIOS SET ID= ?, NOMBRE_USUARIO = ?, PASSWORD = ?, APELLIDO = ?, DIRECCION = ?, COMENTARIOS = ? WHERE ID=?", [clave.get()]

    miCursor.execute(sentencia, [Id1, nombre1, password1, apellido1, direccion1, comentarios1])

I expected the database to update but I get this error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\John\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "Practica_Guiada.py", line 148, in actualizaDatos
    miCursor.execute(sentencia, [Id1,nombre1, password1, apellido1, direccion1, comentarios1])
ValueError: operation parameter must be str

Answer 1

You don't need [clave.get()] at the end of the assignment to sentencia . That's setting the variable to a tuple, not the SQL string.

You also don't have enough parameters in your miCursor.execute() call. There are 7 ? in the SQL, but only 6 elements in the parameter list. You need to repeat Id1 because it's at the beginning and end (but actually, there's no need to set ID , since you'd just be setting it to the same value it already has).

def actualizaDatos():

    Id1 = clave.get()
    nombre1 = nombre.get()
    password1 = password.get()
    apellido1 = apellido.get()
    direccion1 = direccion.get()
    comentarios1 = comentarios.get()


    sentencia="UPDATE DATOSUSUARIOS SET NOMBRE_USUARIO = ?, PASSWORD = ?, APELLIDO = ?, DIRECCION = ?, COMENTARIOS = ? WHERE ID=?"

    miCursor.execute(sentencia, [nombre1, password1, apellido1, direccion1, comentarios1, Id1])