Question

我有一个带有customers表的数据库，其中包含字段（id，name，surname，DOB）。我创建了一个显示名称和姓氏的树视图，但是当我尝试将DOB插入到树视图中时，我得到一个错误列索引3超出范围。另外请你解释一下treeview实际上是如何工作的，因为我已经复制了教程中的代码并对其进行了调整，但仍然没有完全理解它。

    from tkinter import *
    from tkinter import ttk
    import sqlite3
    import os.path

   class Product:
db_name = 'database.db'

def __init__(self, wind):
    self.wind = wind
    self.wind.title('IT Products')

    frame = LabelFrame (self.wind, text = 'Add new record')
    frame.grid (row = 0, column = 1)

    Label (frame, text = 'Name: ').grid (row = 1, column = 1)
    self.name = Entry (frame)
    self.name.grid(row = 1, column = 2)

    Label (frame, text = 'Surname: ').grid (row = 2, column = 1)
    self.price = Entry (frame)
    self.price.grid(row = 2, column = 2)


    ttk.Button (frame, text= 'Add record', command = self.adding).grid (row = 3, column =2 )
    self.message = Label (text = '',fg = 'red')
    self.message.grid (row = 3, column = 0)




    self.tree = ttk.Treeview (height = 10, colum = 2)
    self.tree.grid(row = 100, column = 0, columnspan = 100)
    self.tree.heading('#0', text = 'Name', anchor = W)
    self.tree.heading(2, text = 'Surname', anchor = W)
    self.tree.heading(3, text = 'DOB', anchor = W)
    self.tree.heading(3, text = "column B")


    ttk.Button (text = 'Delete record', command = self.deleting).grid (row = 10, column = 5)
    ttk.Button (text = 'Edit record').grid (row = 10, column = 1)

    self.viewing_records()


def run_query (self, query, parameters = ()): 


    with sqlite3.connect(self.db_name) as conn:
        cursor = conn.cursor()
        query_result = cursor.execute (query, parameters)
        conn.commit()
    return query_result


def viewing_records(self):
    records = self.tree.get_children()
    for element in records:
        self.tree.delete (element)
    query = 'SELECT * FROM customers '
    db_rows = self.run_query (query)
    for row in db_rows:
    ##           self.tree.insert('', 2, text=str(), values=(row[1], row[2], 
    row[3]))

       self.tree.insert ('', 2, text = row[1], values=(row[1], row[2], row[3]))

def validation(self):
   return len (self.name.get()) != 0 and len (self.price.get()) != 0

def adding (self):

    if self.validation ():
        query = 'INSERT INTO customersVALUES (NULL, ?, ?)'
        parameters = (self.name.get(), self.price.get())
        self.run_query (query, parameters)
        self.message['text'] = 'Record {} added'.format (self.name.get())
        self.name.delete (0, END)
        self.price.delete (0,END)
    else:
        self.message['text'] = 'Name field or price is empty'
        self.viewing_records()


def deleting (self):
    self.message ['text'] = ''
    try:
        self.tree.item(self.tree.selection()) [ 'values'] [0]
    except IndexError as e:
        self.message[text] = 'Please select record'
        return
    self. message['text'] = ''
    name = self.tree.item(self.tree.selection())['text']
    query = 'DELETE FROM customers WHERE name = ?'
    self.run_query(query, (name,))
    self.message['text'] = 'Record {} deleted'.format(name)
    self.viewing_records()





    if __name__ == '__main__':
         wind = Tk()
         application = Product (wind)
         wind.mainloop()

Answer 1

要避免列索引错误，请提供列标识符列表，如下所示：

    self.tree = ttk.Treeview(height=10, columns=("lname", "sex", "sdate", "dob"))
    self.tree.grid(row=100, column=0, columnspan=100)
    self.tree.heading('#0', text='First Name', anchor=W)
    self.tree.heading("lname", text='Last Name', anchor=W)
    self.tree.heading("sex", text='Gender', anchor=W)
    self.tree.heading("sdate", text='Start Date', anchor=W)
    self.tree.heading("dob", text='Birth Date', anchor=W)

Python - tkinter - tree - 数据库问题

1 个答案: