Question

假设我有一个包含USR_NR字段（整数类型）的数据库。而且我知道现场的所有数据。没有任何惊喜。

USR_NR : 1,3,4,7,9,12,44,13,78

我需要将此字段列出为混合格式，例如1,78,44,9,7,3,12,4,13 没有上市规则。我想按照自己想要的方式进行排序。

我尝试过ORDER BY，但如何前进？我不能使用ASC，DESC

SELECT * FROM DB ORDER BY ?

你能帮我吗？

Answer 1

您需要的是一种表格，您可以使用以下功能为每条记录设置优先级编号：

import wx
from numpy import arange, sin, pi,cos
import numpy as np
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.patches as patches

class MainFrame(wx.Frame):
    def __init__(self, parent ):
        wx.Panel.__init__(self, parent,name="Main", size = (800,800))
        self.Panel = Panel(self)


class Panel(wx.Panel):
    def __init__(self,parent):
        super().__init__(parent)
        panel = wx.Panel(self)
        self.canvas_panel = CanvasPanel(self)
        self.zoom_panel=Zoom(parent=self)
        self.zoom_panel2=Zoom2(parent=self)
        canvas_sizer = wx.BoxSizer(wx.HORIZONTAL)
        canvas_sizer.Add(self.canvas_panel,1,wx.EXPAND)
        canvas_sizer.Add(self.zoom_panel,1,wx.EXPAND)
        canvas_sizer.Add(self.zoom_panel2,1,wx.EXPAND)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(panel)
        sizer.Add(canvas_sizer)
        self.SetSizerAndFit(sizer)
        self.Show()

class CanvasPanel(wx.Panel):
    """ Panel du graphique matplotlib """
    def __init__(self, parent , size=(200,350)):
        super().__init__(parent)
        self.figure = Figure(figsize =(4,4))
        self.canvas = FigureCanvas(self, -1, self.figure)
        self.axes = self.figure.add_subplot(111)
        self.Size = self.canvas.Size
        self.parent = parent
        t = arange(0.5, 3.0, 0.01)
        s = cos(2 * pi * t)
        self.axes.plot(t, s)
        self.axes.get_xaxis().set_visible(False)
        self.axes.get_yaxis().set_visible(False)
        self.canvas.mpl_connect('button_press_event', self.on_press)
        x = y = 0.02
        self.rect = patches.Rectangle((x, y), 0.4,0.4,edgecolor='g', alpha=1, fill=None, label='Label')
        self.axes.add_patch(self.rect)
        self.axes.plot()

    def on_press(self, click):
        x1, y1 = click.xdata, click.ydata
        zx1 = x1 - 0.2
        zy1 = y1 - 0.2
        zx2 = x1 + 0.2
        zy2 = y1 + 0.2
        self.rect.set_x(x1 - 0.2) #Move the rectangle and centre it on the X click point
        self.rect.set_y(y1 - 0.2) #Move the rectangle and centre it on the Y click point


        self.axes.plot()
        self.canvas.draw()
        self.zoom_axes=[zx1,zx2,zy1,zy2]
        self.parent.zoom_panel.Update(self)
        self.parent.zoom_panel2.Update(self)



class Zoom(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self,parent,size=(200,200))
        self.Show()
    def Update(self,parent):
        #Load axis values of the selected rectangle
        zoom_axes=parent.zoom_axes

        #duplicate the plot from the main panel
        self.figure = Figure(figsize =(4,4))
        self.canvas = FigureCanvas(self, -1, self.figure)
        self.axes = self.figure.add_subplot(111)
        #Apply axis of drawn rectangle to the plot
        self.axes.axis(zoom_axes)
        t = arange(0.5, 3.0, 0.01)
        s = cos(2 * pi * t)
        self.axes.plot(t, s)
        self.axes.get_xaxis().set_visible(False)
        self.axes.get_yaxis().set_visible(False)
        self.canvas.mpl_connect('button_press_event', self.on_press)
        x = y = 0.01
        self.rect = patches.Rectangle((x, y), 0.02, 0.02,edgecolor='g', alpha=1, fill=None, label='Label')
        self.axes.add_patch(self.rect)
        self.axes.plot()



    def on_press(self, click):
        x1, y1 = click.xdata, click.ydata
        zx1 = x1 - 0.01
        zy1 = y1 - 0.01
        zx2 = x1 + 0.01
        zy2 = y1 + 0.01
        self.rect.set_x(x1 - 0.01) #Move the rectangle and centre it on the X click point
        self.rect.set_y(y1 - 0.01) #Move the rectangle and centre it on the Y click point


        self.axes.plot()
        self.canvas.draw()
        self.zoom_axes=[zx1,zx2,zy1,zy2]

class Zoom2(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self,parent,size=(200,200))
        self.Show()
    def Update(self,parent):
        #Load axis values of the selected rectangle
        zoom_axes=parent.zoom_axes

        #duplicate the plot from the main panel
        self.figure = Figure(figsize =(4,4))
        self.canvas = FigureCanvas(self, -1, self.figure)
        self.axes = self.figure.add_subplot(111)
        #Apply axis of drawn rectangle to the plot
        self.axes.axis(zoom_axes)
        t = arange(0.5, 3.0, 0.01)
        s = cos(2 * pi * t)
        self.axes.plot(t, s)
        self.axes.get_xaxis().set_visible(False)
        self.axes.get_yaxis().set_visible(False)
        self.canvas.mpl_connect('button_press_event', self.on_press)
        x = y = 0.01
        self.rect = patches.Rectangle((x, y), 0.02, 0.02,edgecolor='g', alpha=1, fill=None, label='Label')
        self.axes.add_patch(self.rect)
        self.axes.add_artist(self.rect)

        self.axes.plot()


    def on_press(self, click):
        x1, y1 = click.xdata, click.ydata
        zx1 = x1 - 0.01
        zy1 = y1 - 0.01
        zx2 = x1 + 0.01
        zy2 = y1 + 0.01
        self.rect.set_x(x1 - 0.01) #Move the rectangle and centre it on the X click point
        self.rect.set_y(y1 - 0.01) #Move the rectangle and centre it on the Y click point


        self.axes.plot()
        self.canvas.draw()
        self.zoom_axes=[zx1,zx2,zy1,zy2]



app = wx.App()
frame = MainFrame(None).Show()
app.MainLoop()

在我的文章中对此进行了详细说明，其中还包括一个演示：

Sequential Rows in Microsoft Access

如果您没有帐户，请浏览链接：阅读全文。

代码也在 GitHub 上：VBA.RowNumbers

Answer 2

您可以使用instr()：

order by instr(",1,78,44,9,7,3,12,4,13,", "," & USR_NR & ",")

或者，更详细些，使用switch：

order by switch(USR_NR = 1,  1,
                USR_NR = 78, 2,
                USR_NR = 44, 3,
                . . .
               )

sql

2 个答案: