无法使级联组合框工作

本文介绍了无法使级联组合框工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图使级联组合框，但我似乎无法让它工作。例如，如果我在第一个组合框中选择特定的计算机，则第二个组合框应该只显示与该计算机兼容的HDD。我还提供了一个链接到我创建的数据库。

我有两个表格，其中包含以下字段：

tbl电脑（电脑）

tblHDD（HDD，电脑）

cboxComputer Row Source： SELECT tblHDD.HDD，tblHDD.Computer FROM tblHDD;

  Private Sub cboxComputer_AfterUpdate（）
 Me.cboxHDD.RowSource =SELECT HDD & _ 
FROM tblHDD& _ 
WHERE Computer =& Nz（Me.cboxComputer）& _ 
ORDER BY HDD
 End Sub

解决方案

数据库中的Computer字段是字符串数据类型。尝试在名称周围加上撇号，如下所示：

  Private Sub cboxComputer_AfterUpdate（）
 Me.cboxHDD.RowSource =SELECT HDD& _ 
FROM tblHDD& _ 
WHERE Computer ='& Nz（Me.cboxComputer）& '& _ 
ORDER BY HDD
 End Sub

I am trying to make cascading combo boxes but I can't seem to get it to work. For example, if I select a specific computer in the first combo box, then the second combo box should only show the HDD that is compatible with that computer. I also provided a link to the database that I have created. Can anyone help me out with this?

I have 2 tables with the fields:

tblComputer(Computer)
tblHDD(HDD, Computer)

cboxComputer Row Source: SELECT tblComputer.Computer FROM tblComputer;

cboxHDD Row Source: SELECT tblHDD.HDD, tblHDD.Computer FROM tblHDD;

Private Sub cboxComputer_AfterUpdate()
    Me.cboxHDD.RowSource = "SELECT HDD " & _
                           "FROM tblHDD " & _
                           "WHERE Computer = " & Nz(Me.cboxComputer) & _
                           "ORDER BY HDD"
End Sub

https://drive.google.com/file/d/0Bye-M8FI1tRURmQ0MEFzRjBCdWM/view?usp=sharing

解决方案

The Computer field in the database is a string datatype. Try putting apostrophes around the name like this:

Private Sub cboxComputer_AfterUpdate()
    Me.cboxHDD.RowSource = "SELECT HDD " & _
                       "FROM tblHDD " & _
                       "WHERE Computer = '" & Nz(Me.cboxComputer) & "' " & _
                       "ORDER BY HDD"
End Sub

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