问题描述
我有一个基于表 T 的表单 TForm，设置为数据表.我的目标是向数据表添加一个可过滤的列，其中该列的值是使用另一列的值通过查询计算得出的.
I have a form TForm based on table T, set up as a datasheet. My goal is to add a filterable column to the datasheet where the column's value is calculated from a query using another column's value.
我尝试通过向 T 添加文本框 currentBox 来实现此目的.currentBox 的控件来源是:
I tried to do this by adding a text box currentBox to T. The control source for currentBox is:
=DLookUp("name","currentStatus","itemID=" & [ID])
其中 [ID] 是 T 中的一个字段，currentStatus 是对 T 表的聚合查询> 相关.
where [ID] is a field in T and currentStatus is an aggregate query on a table that T is related to.
我可以过滤 TForm 中 T 中的所有字段.但是我无法过滤 currentBox，即使它也显示为表单中的一列；点击列标题没有任何作用.
I can filter on all the fields in TForm that are in T. But I can't filter on currentBox, even though it also appears as a column in the form; clicking on the column header doesn't do anything.
我猜问题是 currentBox 没有绑定到 T 中的字段；有没有办法解决这个问题?
I'm guessing the problem is that currentBox is not bound to a field in T; is there a way to work around this?
推荐答案
我最终解决这个问题的方法是向 T 添加一个字段，并在 期间更新该字段AfterUpdate() 事件，带有来自 DLookup() 调用的值.由于该字段现在不再基于查询，因此可用于过滤表单.
The way that I ended up solving this was to add a field to T, and have that field updated during the AfterUpdate() event with the value from the DLookup() call. Because the field is now no longer query-based, it can be used to filter the form.
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