尝试从 sqlite 查询将变量传递到 CTkComboBox

Question

我对 Python 来说是一个相对新手，但是，我想创建一个自定义预算程序以获得更多练习和接触。到目前为止我有以下课程 -

class NewAccountEntryFrame(CTkFrame):

    def __init__(self, master, cursor):
        super().__init__(master=master)
        self.cursor = cursor
        self.account_types = []
        print("self.account_types", self.account_types) #debugging line to make sure the self.account_types is empty at this point

        self.frame_label = CTkLabel(master=self, text="New Account Entry", font=("Arial", 30))
        self.frame_label.pack(pady=10)

        self.new_account_label = CTkLabel(master=self, text="Enter New Account Name:")
        self.new_account_label.pack(pady=5)

        self.new_account_entry = CTkEntry(master=self, width=30)
        self.new_account_entry.pack(pady=5)
        self.new_account_entry.bind("<Return>", self.add_account)
        
        self.new_account_type_label = CTkLabel(master=self, text="Enter New Account Type:")
        self.new_account_type_label.pack(pady=5)

        self.new_account_type_combobox = CTkComboBox(master=self,  width=30)
        self.new_account_type_combobox.pack(pady=5)
        self.new_account_type_combobox.bind("<<ComboboxSelected>>", self.on_click)
       
        self.new_account_add_button = CTkButton(master=self, text="Add")
        self.new_account_add_button.pack(pady=10)

输入 new_account_entry 后，我将调用以下函数来检查该名称是否是

AccountName

表中的现有名称：

def add_account(self, event):
        new_account_name = self.new_account_entry.get()
        if not new_account_name:
            messagebox.showerror("Error", "Please enter an account name.")
            return

        self.cursor.execute("SELECT * FROM Account WHERE AccountName = ?", (new_account_name,))
        existing_account = self.cursor.fetchone()
        if existing_account:
            messagebox.showerror("Error", "Account already exists.")
        else:
            messagebox.showinfo("Success", "Account is not in the database. Please select an account type.")
            self.update_account_types()  

所以，现在就是我挣扎的地方。我调用

update_account_types()

函数，该函数从

AccountTypes

表中提取

AccountType

列表：

def update_account_types(self):
        print("Fetching Account Types...")
        account_types = [row[0] for row in self.cursor.execute("SELECT AccountType FROM AccountType   ORDER BY AccountType")]
        
        print ("account types", account_types) #Prints out the account_types from the database as expected
        self.account_types = account_types
        
        print("self.account_types", self.account_types)  #prints out the account_types from the database as expected

所以现在我的

self.account_types

变量在上面的类中有值，但是，当我单击

new_account_type_combobox

时，我看到的唯一值是

CTkComboBox

在添加

combobox

函数来检查数据库中是否已存在

add_account

之前，我能够正确填充

account_name

。

我可以将

account_types

打印到屏幕上，但是，它们没有填充组合框。

Answer 1

文档：CTkComboBox

GUI 不会自动将其添加到小部件中。你必须使用

.configure(values=...)

self.new_account_type_combobox.configure(values=["new value 1", "new value 2"])  

在您的代码中它可能意味着

values=self.account_types

self.new_account_type_combobox.configure(values=self.account_types)