Tkinter Treeview显示问题排查：布局管理器使用不当

treeFrame = LabelFrame(root, text="Divisions Table", padx=10, pady=10)
frame.grid(row=1, column=0, padx=10, pady=10) # <-- 错误：这里本应是 treeFrame.grid()
tree = ttk.Treeview(treeFrame, ...)
tree.grid(...)

treeFrame = LabelFrame(root, text="Divisions Table", padx=10, pady=10)
treeFrame.grid(row=1, column=0, padx=10, pady=10) # <-- 修正：正确放置 treeFrame
tree = ttk.Treeview(treeFrame,
                    columns=("Division Code", "Description"),
                    show="headings",
                    height=5)
tree.grid(row=0, column=0, columnspan=3, padx=10, pady=10)

import tkinter as tk
from tkinter import ttk
from tkinter import LabelFrame, Label, Entry # 明确导入Tkinter组件

# 模拟数据库操作函数
class MockDatabase:
    def __init__(self):
        self.data = {
            "divisions": [
                (1, "Sales"),
                (2, "Marketing"),
                (3, "Engineering"),
                (4, "HR"),
                (5, "Finance")
            ]
        }

    def connect(self, db_name):
        print(f"Mock: Connecting to {db_name}")
        return self

    def cursor(self):
        print("Mock: Creating cursor")
        return self

    def execute(self, query):
        print(f"Mock: Executing query: {query}")
        # 简单模拟SELECT * FROM table_name
        if "FROM divisions" in query.upper():
            return self
        return self

    def fetchall(self):
        print("Mock: Fetching all data")
        return self.data.get("divisions", [])

    def close(self):
        print("Mock: Closing connection")

# 替换 sqlite3 模块
sqlite3 = MockDatabase()

def initialConnection():
    # 在真实应用中，这里会建立数据库连接
    print("Mock: Initializing database connection (if needed)")

def get_existing_values(table_name):
  conn = sqlite3.connect('tbf.db')
  c = conn.cursor()
  c.execute('SELECT * FROM ' + table_name)
  existing_values = c.fetchall()
  conn.close()
  return existing_values

# 程序开始
initialConnection()

root = tk.Tk()
root.title("TBF Divisions Entry Form")
root.geometry("600x500")

# 第一部分：数据输入框架
frame = LabelFrame(root, text="TBF Divisions", padx=10, pady=10)
frame.grid(row=0, column=0, padx=10, pady=10)

divisionCodeLabel = Label(frame, text="Division Code")
divisionCodeLabel.grid(row=0, column=0)

divisionCodeEntry = Entry(frame, width=15)
divisionCodeEntry.grid(row=0, column=1)

divisionDescriptionLabel = Label(frame, text="Division Description")
divisionDescriptionLabel.grid(row=0, column=2)
divisionDescriptionEntry = Entry(frame, width=25)
divisionDescriptionEntry.grid(row=0, column=3)

# 第二部分：Treeview 显示框架 (修正后)
treeFrame = LabelFrame(root, text="Divisions Table", padx=10, pady=10)
# 关键修正：确保 treeFrame 被正确放置在 root 窗口的 row=1
treeFrame.grid(row=1, column=0, padx=10, pady=10)

tree = ttk.Treeview(treeFrame,
                    columns=("Division Code", "Description"),
                    show="headings",
                    height=5)
tree.grid(row=0, column=0, columnspan=3, padx=10, pady=10) # Treeview 在 treeFrame 内部

tree.heading("Division Code", text="Division Code")
tree.heading("Description", text="Division Description")
tree.column("Division Code", width=100, anchor="center") # 增加 anchor 居中显示
tree.column("Description", width=200, anchor="w") # 增加 anchor 左对齐显示

# 获取并填充数据
existing_values = get_existing_values("divisions")
print("Fetched existing values:", existing_values) # 打印确认数据

count = 0
for value in existing_values:
    tree.insert("", "end", iid=count, values=(value[0], value[1]))
    count += 1 # 确保 iid 唯一性

root.mainloop()