SQL将条件包括在哪里如果不为空

Question

在访问中我一直试图设置用户过滤器上显示的子表单中显示的是检查列表。我尝试过的其他方法还没有正常工作，但我已经成功使用了下面的代码，它会在用户填写其他过滤器选项时进行过滤。我能弄清楚的是如何让它接受多个过滤器，除非我详细说明了盒子的每种可能组合

那么反正这是真的可能，还是我需要看其他选项？

WHERE [STATUS] = "OPEN" 
AND 
(ANY FORM FILTERS is not Null [Filter by all those that are not null to its matching column]) 

有效有没有简单的方法，包括一个条件，如果一个表单过滤器不为空

SELECT Inspections.INS_ID 
    ,Inspections.Category 
    ,Inspections.Assigned_Officer 
    ,Inspections.Raised_For 
    ,Inspections.Account 
    ,Inspections.Number 
    ,Inspections.Street 
    ,Inspections.Area 
    ,Inspections.Postcode 
    ,Inspections.Date_Raised 
    ,Inspections.Reason 
    ,Inspections.INS_Comments 
FROM Inspections 
WHERE (
     ((Inspections.STATUS) = "Open") 
     AND (([Forms]![Manage_Open]![Filter_ID]) IS NULL) 
     AND (([Forms]![Manage_Open]![Filter_account]) IS NULL) 
     AND (([Forms]![Manage_Open]![Filter_officer]) IS NULL) 
     AND (([Forms]![Manage_Open]![Filter_Number]) IS NULL) 
     AND (([Forms]![Manage_Open]![Filter_Postcode]) IS NULL) 
     AND (([Forms]![Manage_Open]![Filter_Category]) IS NULL) 
     AND (
      (([Forms]![Manage_Open]![Filter_From]) IS NULL) 
      AND (([Forms]![Manage_Open]![Filter_To]) IS NULL) 
      ) 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_ID]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_ID]) = [Inspections].[INS_ID] 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_account]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_account]) = [Inspections].[Account] 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_officer]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_officer]) = [Inspections].[Assigned_Officer] 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_Number]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_Number]) = [Inspections].[Number] 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_Postcode]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_Postcode]) = [Inspections].[Postcode] 
     ) 
    OR (
     ([Forms]![Manage_Open]![Filter_Category]) IS NOT NULL 
     AND ([Forms]![Manage_Open]![Filter_Category]) = [Inspections].[Category] 
     ) 
    OR (
     (
      (([Forms]![Manage_Open]![Filter_From]) IS NOT NULL) 
      AND (([Forms]![Manage_Open]![Filter_To]) IS NOT NULL) 
      ) 
     AND ([Inspections].[Raised_For]) BETWEEN (
        ([Forms]![Manage_Open]![Filter_From]) 
        AND ([Forms]![Manage_Open]![Filter_to]) 
        )) 
     ); 

Answer 1

如果我理解正确的话，你有几个未绑定控件的形式，用户将填写。然后，您要根据用户输入的内容筛选您的子表单。 在这种情况下，您尝试使用的方法将变得非常复杂且难以维护，更不用说缓慢的大量数据。 最好的选择是在代码中构建过滤器。 我经常做的是将控件命名为与字段名称相同，并将字段类型放在控件的标签属性中。然后通过控件循环来构建过滤器。这是空码，但应该给你一个开始。 Dim strFilter as string Dim ctL as Access.control For Each ctL in Me.Controls If Not ISNull(ctL) And ctL.Tag <> "" Then strFilter = strFilter & " AND " & ctl.Name & " = " If ctL.Tag = "Text" Then strFilter = strFilter & "'" & Replace(ctl, "'","''") & "'" ElseIf ctL.Tag = "Date" Then strFilter = strFilter & "#" & ctl & "#" Else strFilter = strFilter & ctlEnd If Next If strFilter <> "" Then strFilter = mid(strFilter, 6) strFilter = " Where " & strFilter End If Me.yourSubForm.Form.Recordsource = "Select * From <yourQuery> " & strfilter