在IN语句中使用文本框值 [英] Using textbox values in IN statement

问题描述

我正在尝试使其正常工作?如何设置要在IN()语句中使用的文本框?我希望用户能够列出他们要查询的国家/地区

I'm trying to get this to work? How can I set a textbox to be used in an IN() statement? I would like users to be able to list out countries they'd like to query on

SELECT *
FROM Table
WHERE CountryID IN (forms!frmImport!txtCountries)

推荐答案

您不能仅将文本框的名称直接放入SQL字符串中.
相反，您需要使用文本框的内容来构建像这样的SQL字符串:

You can't just put the name of the textbox directly into the SQL string.
Instead, you need to use the content of the textbox to build a SQL string like this:

SELECT * FROM Table WHERE CountryID IN (1,2,3)

如果您的用户在文本框中输入以逗号分隔的CountryID列表，则可以这样构建SQL:

If your users enter a comma-separated list of CountryIDs into the textbox, you can build the SQL like this:

Dim SQL As String

SQL = "SELECT * FROM Table WHERE CountryID IN (" & Forms!frmImport!txtCountries & ")"

但是我不会这样做，因为它很简单，但是容易出现输入错误和SQL注入.

But I wouldn't do it this way because it's simple, but prone to input errors and SQL injection.

一种更好的方法是使用一个列表框，设置Multi Select属性(以便可以选择多个条目)，并用所有可用国家/地区的列表填充它.

A better way would be to use a list box, set the Multi Select property (so that multiple entries can be selected) and fill it with a list of all available countries.

然后，用户可以选择所需的内容，然后可以使用列表框中的选定项来构建SQL字符串:

Then, the user can select the ones that he wants, and you can build the SQL string using the selected items from the listbox:

Dim ListItem As Variant
Dim CountryList As String
Dim SQL As String

For Each ListItem In Forms!frmImport!lstCountries.ItemsSelected
    If CountryList > "" Then
        CountryList = CountryList & ","
    End If
    CountryList = CountryList & ListItem
Next

SQL = "SELECT * FROM Table WHERE CountryID IN (" & CountryList & ")"

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