Question

我有一个拖放列表框（found here），可让用户向上或向下拖动/移动项目以重新排序。

我的db.sqlite文件最初看起来像这样：

>>> make_df()
    ordering          fruit
0          0         apples
1          1        oranges
2          2    blueberries
3          3     watermelon
4          4     cantaloupe
5          5          pears
6          6    pomegranate
7          7    raspberries
8          8   blackberries
9          9  boysenberries
10        10     nectarines

我要做的是重新排序列表框中的项目并将该订单保存到数据库中，这样当我重新启动程序时，这些项目的顺序与我上次使用它时的顺序相同。

问题：每次重新启动程序时，列表框中的项目始终处于相同的顺序。但是，当我重新排序项目时，运行查看数据库的make_df以查看排序并返回数据帧，它会在该会话期间显示数据库更新。 它不是永久保存它，而是我无法弄清楚的。

import tkinter as tk
import pandas as pd
import sqlite3
root = tk.Tk()

def make_sqlite_db_for_stackoverflow():
  connection = sqlite3.connect('db.sqlite')
  db_file_name = 'db.sqlite'
  df = pd.DataFrame(
    [(0, 'apples'), (1, 'oranges'), (2, 'blueberries'), (3, 'watermelon'),
     (4, 'cantaloupe'), (5, 'pears'), (6, 'pomegranate'), (7, 'raspberries'),
     (8, 'blackberries'), (9, 'boysenberries'), (10, 'nectarines')],
    columns=['ordering', 'fruit']
    )
  df.to_sql('columns', connection, index=False, if_exists='replace')
  connection.close()

make_sqlite_db_for_stackoverflow()

def make_df():
  print(pd.DataFrame(sqlite3.connect('db.sqlite').cursor().execute(
    'SELECT * FROM columns ORDER BY "ordering";').fetchall(), columns=['ordering', 'fruit']))

class Drag_and_Drop_Listbox(tk.Listbox):
  """ A tk listbox with drag'n'drop reordering of entries. """
  def __init__(self, master, **kw):
    kw['selectmode'] = tk.EXTENDED
    tk.Listbox.__init__(self, master, kw)
    self.bind('<Button-1>', self.setCurrent)
    self.bind('<B1-Motion>', self.shiftSelection)
    self.curIndex = None
  def setCurrent(self, event):
    self.curIndex = self.nearest(event.y)
  def shiftSelection(self, event):
    i = self.nearest(event.y)
    if i < self.curIndex:
      x = self.get(i)
      self.delete(i)
      self.insert(i+1, x)
      self.curIndex = i
    elif i > self.curIndex:
      x = self.get(i)
      self.delete(i)
      self.insert(i-1, x)
      self.curIndex = i

def update_ordering(*args):
  connect = sqlite3.connect('db.sqlite')
  cursor = connect.cursor()
  field_ordering = [(order,fruit) for order,fruit in enumerate(ddlistbox.get(0, 'end'))]
  print(field_ordering)
  for field in field_ordering:
    cursor.execute("UPDATE columns SET 'ordering'="+str(field[0])+" WHERE fruit='"+field[1]+"';")
  connect.commit()
  connect.close()
  print(ddlistbox.curselection())

scrollbar = tk.Scrollbar(root, orient="vertical")
ddlistbox = Drag_and_Drop_Listbox(root, yscrollcommand=scrollbar.set)
scrollbar.grid(row=0, column=1, sticky='ns')
scrollbar.config(command=ddlistbox.yview)

def get_sqlite_report_fields():
  conn = sqlite3.connect('db.sqlite')
  conn.row_factory = lambda cursor, row: row[0]
  cursor = conn.cursor()
  fetch = cursor.execute("SELECT fruit FROM columns ORDER BY 'ordering';").fetchall()
  conn.close()
  return fetch

for fruit in get_sqlite_report_fields():
  ddlistbox.insert(0, fruit)
ddlistbox.config(width=30)
ddlistbox.bind('<Double-Button-1>' , func=update_ordering)
ddlistbox.grid(row=0, column=0)

button = tk.Button(root, text='Check', command=update_ordering)
button.grid(row=1, column=0)

root.mainloop()

Answer 1

非常怀疑任何人都会回答我的问题，所以我发布了我的解决方案。它使用拖放列表框允许用户在列表框中排列项目，并将其项目排序保存到数据库中以供下次使用。

<form method="POST" action="index.php">
    <input type="button" class="btn btn-danger" name="Delete" value="Delete"/>

<table class="table table-striped table-hover table-responsive" id="inventoryTable">
<thead>
<tr>
    <td>Serial ID</td>
    <td>Name</td>
    <td>Manufacturer</td>
    <td>Keys</td>
    <td>Description</td>
    <td>Category</td>
    <td>Block</td>
    <td>Floor</td>
    <td>Room</td>
</tr>
</thead>
<tbody>
        <?php while($row = mysqli_fetch_array($allresult)) { ?>
<tr>
  <td><input name="checkbox[]" type="checkbox" value="<?php echo $row['serialid']; ?>"></td>
  <td><?php echo $row['serialid']?></td>
  <td><?php echo $row['name'] ?></td>
  <td><?php echo $row['manufacturer'] ?></td>
  <td><?php echo $row['licensekeys'] ?></td>
  <td><?php echo $row['description'] ?></td>
  <td><?php echo $row['categoryname'] ?></td>
  <td><?php echo $row['block'] ?></td>
  <td><?php echo $row['floor'] ?></td>
  <td><?php echo $row['room'] ?></td>
</tr>
<?php }?>
</tbody>
</table>
</form>

Python Tkinter保存列表框项目订购到Sqlite数据库

1 个答案: