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ms-access - MS Access 2003 - 连接表单上相同 ID 的字段类型

转载 作者:行者123 更新时间:2023-12-03 07:00:21 25 4
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好吧,工作中的一个人有一个小的 Access 数据库,他用它来跟踪事情。他使用的这个表单已经查询了他需要的内容并在表单上生成结果,这确实是他所需要的。

有一件事是,他为每条记录提供了重复项,这些记录以不同的“类型”作为字段“标识符”(我称之为)......这是一个示例:

ID     Name          Price     Type
1 Prodcut A $10 A1
1 Product A $10 A2
1 Product A $10 A3
2 Product B $12 A1
etc

自然地,这是应该发生的,他想看到所有类型,但考虑到它最终有一英里长,他问我是否有办法连接“类型”,以便显示以下内容:

ID     Name          Price     Type
1 Prodcut A $10 A1, A2, A3
1 Product B $12 A1, A2, A3
1 Product C $14 A1, A2, A3
2 Product D $7 A1, A2, A3

...在表格上。谁能帮我解决这个问题吗?谢谢!

最佳答案

好的,我发现在 VBA 中创建了一个函数,可在查询中使用它来检索表单的数据。

功能是

Public Function ConcatRelated(strField As String, _
strTable As String, _
Optional strWhere As String, _
Optional strOrderBy As String, _
Optional strSeparator = ", ") As Variant
On Error GoTo Err_Handler
'Purpose: Generate a concatenated string of related records.
'Return: String variant, or Null if no matches.
'Arguments: strField = name of field to get results from and concatenate.
' strTable = name of a table or query.
' strWhere = WHERE clause to choose the right values.
' strOrderBy = ORDER BY clause, for sorting the values.
' strSeparator = characters to use between the concatenated values.
'Notes: 1. Use square brackets around field/table names with spaces or odd characters.
' 2. strField can be a Multi-valued field (A2007 and later), but strOrderBy cannot.
' 3. Nulls are omitted, zero-length strings (ZLSs) are returned as ZLSs.
' 4. Returning more than 255 characters to a recordset triggers this Access bug:
' http://allenbrowne.com/bug-16.html
Dim rs As DAO.Recordset 'Related records
Dim rsMV As DAO.Recordset 'Multi-valued field recordset
Dim strSql As String 'SQL statement
Dim strOut As String 'Output string to concatenate to.
Dim lngLen As Long 'Length of string.
Dim bIsMultiValue As Boolean 'Flag if strField is a multi-valued field.

'Initialize to Null
ConcatRelated = Null

'Build SQL string, and get the records.
strSql = "SELECT " & strField & " FROM " & strTable
If strWhere <> vbNullString Then
strSql = strSql & " WHERE " & strWhere
End If
If strOrderBy <> vbNullString Then
strSql = strSql & " ORDER BY " & strOrderBy
End If
Set rs = DBEngine(0)(0).OpenRecordset(strSql, dbOpenDynaset)
'Determine if the requested field is multi-valued (Type is above 100.)
bIsMultiValue = (rs(0).Type > 100)

'Loop through the matching records
Do While Not rs.EOF
If bIsMultiValue Then
'For multi-valued field, loop through the values
Set rsMV = rs(0).Value
Do While Not rsMV.EOF
If Not IsNull(rsMV(0)) Then
strOut = strOut & rsMV(0) & strSeparator
End If
rsMV.MoveNext
Loop
Set rsMV = Nothing
ElseIf Not IsNull(rs(0)) Then
strOut = strOut & rs(0) & strSeparator
End If
rs.MoveNext
Loop
rs.Close

'Return the string without the trailing separator.
lngLen = Len(strOut) - Len(strSeparator)
If lngLen > 0 Then
ConcatRelated = Left(strOut, lngLen)
End If

Exit_Handler:
'Clean up
Set rsMV = Nothing
Set rs = Nothing
Exit Function

Err_Handler:
MsgBox "Error " & Err.Number & ": " & Err.Description, vbExclamation, "ConcatRelated()"
Resume Exit_Handler
End Function

并且在查询中用作

SELECT Table1.ID, Table1.ProductName, Table1.ProductPrice, ConcatRelated("Type","Table1","ID = " & [Table1]![ID] & " AND ProductName = """ & [Table1]![ProductName] & """ AND ProductPrice = " & [Table1]![ProductPrice]) AS Expr1
FROM Table1
GROUP BY Table1.ID, Table1.ProductName, Table1.ProductPrice, ConcatRelated("Type","Table1","ID = " & [Table1]![ID] & " AND ProductName = """ & [Table1]![ProductName] & """ AND ProductPrice = " & [Table1]![ProductPrice]);

关于ms-access - MS Access 2003 - 连接表单上相同 ID 的字段类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1491906/

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