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请耐心等待，我是 VBA 的菜鸟，我无意编写代码，但我最终还是这样做了，因为我无法看到没有它我将如何实现我想要的东西。我一直在互联网上搜索 3 天，每天 10 小时，但运气不佳。我有一个要保护的 Access 数据库。让我解释一下我首先要实现的目标：

1）我有一个表单中的组合框，可以在表格中查找值，即项目的项目代码。这基本上是一个库存的事情。我有一个查询，其中有一个计算字段，该字段返回每个项目的剩余库存。我有另一个查询，它将项目代码作为参数并返回该特定项目代码的剩余库存。

我想要做的是检查剩余库存是否为 0，如果是，则在从组合框列表中选择此项目代码时，让 msgbox 显示一条消息，指出该项目没有库存，因此无法发出，并重置组合框（即好像没有进行选择）

这是我的代码；组合框的 afterUpdate 事件：

Private Sub Item_Code_AfterUpdate()

Dim dbMyDatabase As DAO.Database

Dim rsMyRecords As DAO.Recordset

Dim strQuery As String

strQuery = "SELECT [Store_Items].[Item Code], Store_Items.[Opening Stock], IIf((Nz([Opening Stock],0)+Nz([Quantity Purchased],0)-Nz([Quantity Issued],0)<0),0,(Nz([Opening Stock],0)+Nz([Quantity Purchased],0)-Nz([Quantity Issued],0))) AS [Remaining Stock] FROM (Purchases RIGHT JOIN Store_Items ON Purchases.[Item Code] = Store_Items.[Item Code]) LEFT JOIN Issuances ON Store_Items.[Item Code] = Issuances.[Item Code] WHERE (((Store_Items.[Item Code])=[Forms]![Issuances]![Item Code]));"

Set dbMyDatabase = CurrentDb

Set rsMyRecords = dbMyDatabase.OpenRecordset(strQuery)

Dim Msg, Style, Title, Response

Msg = "This Item is out of Stock! You Cannot Issue this item!"
Style = vbOK
Title = "Warning!"

If rsMyRecords![Item Code] <= 0 Then
Response = MsgBox(Msg, Style, Title)
If Response = vbOK Then Me![Item Code].Requery

End Sub

2) 我制作了 2 个版本的导航面板。其中一位可以访问所有表格，而另一位则具有有限的访问权限。这由登录类型决定。现在，唯一有效的是第一个，我不明白为什么 ElseIfs 不起作用。当我尝试使用其他类型登录时，单击登录按钮，没有任何反应。

我还想隐藏导航窗格并访问允许数据库设计编辑以及根据登录类型在设计视图中查看表和表单的默认菜单，但我不知道如何实现这一点。

Private Sub LoginBUtton_Click()

'Check to see if data is entered into the UserName combo box

    If IsNull(Me.CBOLogin) Or Me.CBOLogin = "" Then
      MsgBox "You must select a user type.", vbOKOnly, "No User name"
        Me.CBOLogin.SetFocus
        Exit Sub
    End If

    'Check to see if data is entered into the password box

    If IsNull(Me.TextPass) Or Me.TextPass = "" Then
      MsgBox "No Password Entered, Enter a password.", vbOKOnly, "No Password"
        Me.TextPass.SetFocus
        Exit Sub
    End If

    'Check value of password in Users to see if this
    'matches value chosen in combo box

    If Me.TextPass.Value = DLookup("Password", "Users", _
            "[UserID]=" & Me.CBOLogin.Value) Then



    ElseIf (Me.CBOLogin.Value = "Developer") Then
    DoCmd.Close acForm, "LoginForm", acSaveNo
    DoCmd.OpenForm "FullAccessNav"


    ElseIf (Me.CBOLogin.Value = "Office") Then
    DoCmd.Close acForm, "LoginForm", acSaveNo
    DoCmd.OpenForm "LimitedAccessNav"


    ElseIf (Me.CBOLogin.Value = "Store") Then
    DoCmd.Close acForm, "loginForm", acSaveNo
    DoCmd.OpenForm "LimitedAccessNav"

    Else
            MsgBox "Password Invalid. Please Try Again", vbOKOnly, _
            "Invalid Entry!"
            Me.TextPass.SetFocus

    End If

    'If User Enters incorrect password 3 times database will shutdown

    intLogonAttempts = intLogonAttempts + 1

    If intLogonAttempts > 3 Then
      MsgBox "You do not have access to this database.Please contact admin.", _
               vbCritical, "Restricted Access!"
        Application.Quit
    End If

End Sub

请帮忙？:S

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1 回答 1

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好吧，我设法解决了登录问题，但我仍然坚持数据验证位。当我单击组合框中列表中的项目代码时，出现运行时错误 3421。

当我从组合框中选择一个项目代码时，这就是我想要发生的事情。我想从该项目代码的查询中获取计算字段，（这个计算字段具有计算的项目剩余库存）如果它是0，那么我想显示一个消息并阻止用户输入这个记录，所以我想重置组合框可以吗？

如果库存在某个水平，我只想显示一个msgbox，仅此而已，通常让用户输入记录，否则，用户只是正常输入记录。

我在这一行收到运行时错误 3421“数据类型转换错误”：

Set rs = db.OpenRecordset("SELECT [Remaining Stock] FROM [InventoryStatusSpecificItem] WHERE [Item Code] = [Forms]![Issuances]![ItemCBO]", Dynaset)

Private Sub ItemCBO_AfterUpdate()

    Dim db As DAO.Database
    Dim rs As DAO.Recordset

    Set db = CurrentDb()


    Set rs = db.OpenRecordset("SELECT [Remaining Stock] FROM [InventoryStatusSpecificItem] WHERE [Item Code] = [Forms]![Issuances]![ItemCBO]", Dynaset)



    If rs.Fields([Remaining Stock]) = "0" Then
    MsgBox "This item is out of stock! Cannot Issue!", vbExclamation + vbOKOnly, "Attention!", vbExclamation
    Me!ItemCBO = Null

    ElseIf rs.Fields("Stock Status") = "Order Now!" Then
    MsgBox "This item has reached its minimum quantity level. Only " + StrRemainingStock + " remains. Quantity Measured as " + StrMeasuredIn, vbExclamation + vbOKOnly, "Attention!"

    Else
    Me!ItemCBO.Requery

    End If

    'close recordset
    rs.Close
    Set db = Nothing
于 2013-01-16T15:11:18.040 回答