关于那个access通用界面的问题。

hoho5999

请教版主，关于那个access通用界面的问题。

在switchboard items 表里面，command栏位的定义是什么用意呢？

Victor_Duane

command字段的内容用于这段代码
Private Function HandleButtonClick(intBtn As Integer)
' This function is called when a button is clicked.
' intBtn indicates which button was clicked.

    ' Constants for the commands that can be executed.
    Const conCmdGotoSwitchboard = 1
    Const conCmdOpenFormAdd = 2
    Const conCmdOpenFormBrowse = 3
    Const conCmdOpenReport = 4
    Const conCmdCustomizeSwitchboard = 5
    Const conCmdExitApplication = 6
    Const conCmdRunMacro = 7
    Const conCmdRunCode = 8
    Const conCmdOpenPage = 9

    ' An error that is special cased.
    Const conErrDoCmdCancelled = 2501
   
    Dim con As Object
    Dim rs As Object
    Dim stSql As String

On Error GoTo HandleButtonClick_Err

    ' Find the item in the Switchboard Items table
    ' that corresponds to the button that was clicked.
    Set con = Application.CurrentProject.Connection
    Set rs = CreateObject("ADODB.Recordset")
    stSql = "SELECT * FROM [Switchboard Items] "
    stSql = stSql & "WHERE [SwitchboardID]=" & Me![SwitchboardID] & " AND [ItemNumber]=" & intBtn
    rs.Open stSql, con, 1    ' 1 = adOpenKeyset
   
    ' If no item matches, report the error and exit the function.
    If (rs.EOF) Then
        MsgBox "读取 Switchboard Items 表时出错。"
        rs.Close
        Set rs = Nothing
        Set con = Nothing
        Exit Function
    End If
   
    Select Case rs![Command]
        
        ' Go to another switchboard.
        Case conCmdGotoSwitchboard
            Me.Filter = "[ItemNumber] = 0 AND [SwitchboardID]=" & rs![Argument]
            
        ' Open a form in Add mode.
        Case conCmdOpenFormAdd
            DoCmd.OpenForm rs![Argument], , , , acAdd

        ' Open a form.
        Case conCmdOpenFormBrowse
            DoCmd.OpenForm rs![Argument]

        ' Open a report.
        Case conCmdOpenReport
            DoCmd.OpenReport rs![Argument], acPreview

        ' Customize the Switchboard.
        Case conCmdCustomizeSwitchboard
            ' Handle the case where the Switchboard Manager
            ' is not installed (e.g. Minimal Install).
            On Error Resume Next
            Application.Run "ACWZMAIN.sbm_Entry"
            If (Err <> 0) Then MsgBox "命令不可用。"
            On Error GoTo 0
            ' Update the form.
            Me.Filter = "[ItemNumber] = 0 AND [Argument] = '默认' "
            Me.Caption = Nz(Me![ItemText], "")
            FillOptions

        ' Exit the application.
        Case conCmdExitApplication
            CloseCurrentDatabase

        ' Run a macro.
        Case conCmdRunMacro
            DoCmd.RunMacro rs![Argument]

        ' Run code.
        Case conCmdRunCode
            Application.Run rs![Argument]

        ' Open a Data Access Page
        Case conCmdOpenPage
            DoCmd.OpenDataAccessPage rs![Argument]

        ' Any other command is unrecognized.
        Case Else
            MsgBox "未知选项。"
   
    End Select

    ' Close the recordset and the database.
    rs.Close
   
HandleButtonClick_Exit:
On Error Resume Next
    Set rs = Nothing
    Set con = Nothing
    Exit Function

HandleButtonClick_Err:
    ' If the action was cancelled by the user for
    ' some reason, don't display an error message.
    ' Instead, resume on the next line.
    If (Err = conErrDoCmdCancelled) Then
        Resume Next
    Else
        MsgBox "执行命令时出错。", vbCritical
        Resume HandleButtonClick_Exit
    End If
   
End Function