VBA 访问 - 如何从多个字段 return max/min

Question

我需要有关 Microsoft Access 中一些 VBA 代码的帮助，这些代码将为下面的每个字段生成 maximum/minimum 值，并 return 附上相应的大小写

强制Table

case            Flxmax   Flxmin  Frxmax  Frxmin 
hs00p16010od    582.24   666.81  796.44  -451.15    
hs00p16015od    878.7    878.7   1096.3  -500.36    
hs00p16020od    1071.95  1071.9  1281.2  -743.05    
hs00p16025od    1186.65  1186.6  1397.8  -959.36

期望输出

Field     Force     Case  
Flxmax   1186.65   hs00p16025od
Flxmin   666.81    hs00p16010od
Frxmax   1397.8    hs00p16025od
Frxmin   -959.36   hs00p16025od

此外，如果 table 中有相同的 max/min 个值，我只需要在结果中选择一个。

除上面显示的字段外，还有 30 个附加字段。我相信我必须遍历每个字段直到到达末尾并记录 max/min 行，但我不确定如何编写此代码。任何帮助都会很棒。

当前代码

Public Sub Max()

Dim sqlStatement As String
Dim rs1 As Object
Dim rs2 As Object
Dim fld As Field
Dim strName As String
Dim maximum As Long
Dim minimum As Long

 sqlStatement = "SELECT * FROM Force;"
 Set rs1 = CurrentDb().OpenRecordset(sqlStatement)

 sqlStatement = "SELECT * FROM Results;"
 Set rs2 = CurrentDb().OpenRecordset(sqlStatement)

 rs2.AddNew      'Add new record to result table

 'Field order to loop though: max, min, skip, max, min, skip...where skip implies a skipped field

 For Each fld In rs1.Fields
 With rs1
     maximum = DMax(fld, Force)
     'Write onto results tables
 End With

 Next fld

 rs2.Update  'Update results table

 Set rs1 = Nothing
 Set rs2 = Nothing

End Sub

Answer 1

你很接近。基本上缺少的是每个 min/max 字段值必须 added/updated 分别与目标 table.

修改后的代码

Public Sub Max()

    Dim db As DAO.Database
    Dim rs1 As DAO.Recordset
    Dim rs2 As DAO.Recordset
    Dim fld As DAO.Field
    Dim newvalue As Long
    Dim newfield As String
    Dim newcase As String
    Dim sqlStatement As String

    Set db = CurrentDb

    sqlStatement = "SELECT * FROM Force;"
    Set rs1 = db.OpenRecordset(sqlStatement)

    sqlStatement = "SELECT * FROM Results;"
    Set rs2 = db.OpenRecordset(sqlStatement)

    For Each fld In rs1.Fields
        rs1.MoveFirst

        newfield = fld.Name
        If newfield <> "case" Then
            newvalue = rs1(newfield).Value
            While Not rs1.EOF
                If Right(newfield, 3) = "min" Then
                    If newvalue > rs1(newfield).Value Then
                        newvalue = rs1(newfield).Value
                        newcase = rs1("Case").Value
                    End If
                ElseIf Right(newfield, 3) = "max" Then
                    If newvalue < rs1(newfield).Value Then
                        newvalue = rs1(newfield).Value
                        newcase = rs1("Case").Value
                    End If
                End If
                rs1.MoveNext
            Wend

            rs2.AddNew
                rs2!Field.Value = newfield
                rs2!Force.Value = newvalue
                rs2!Case.Value = newcase
            rs2.Update
        End If
    Next fld

    Set fld = Nothing
    Set rs1 = Nothing
    Set rs2 = Nothing
    Set db = Nothing

End Sub

这是航空代码，我没有测试数据。您可能需要添加一些错误处理。

VBA 访问 - 如何从多个字段 return max/min

VBA Access - How to return max/min from multiple fields

ms-access

vba