ConcatRelated() 函数的字符限制
Character Limit On ConcatRelated() Function
我一直在使用 Allen Browne 的 ConcatRelated()
函数,但我意识到使用更大的数据集时数据不完整。
此函数是否有字符限制,如果有 - 是否有不同的函数/UDF 可以达到相同的结果?
这是函数:- link 返回原始线程 http://allenbrowne.com/func-concat.html
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
编辑
我正在使用 VBA 和 运行 一个 Into
语句。如果我先生成 table 然后插入数据会更好吗?
当前结构
DoCmd.RunSQL "Select DISTINCT [ImportTable].DSFNum,
ConcatRelated('[Item]','[ImportTable]','[DSFNum] =' & [DSFNum]) AS Item,
ConcatRelated('[Count]','[ImportTable]','[DSFNum] =' & [DSFNum]) AS Count
INTO [OneRowTable]
FROM [ImportTable]"
所有相关信息都可以在 ConcatRelated
函数的代码中找到:
- Notes: Returning more than 255 characters to a recordset triggers this Access bug:
http://allenbrowne.com/bug-16.html
正如该页面上所见,问题不在于功能,而在于 Access 中的文本字段不能包含那么多字符,可以通过使用
之类的东西来解决
SELECT ID, MuchText FROM StructureOnly
UNION ALL
SELECT ID, ConcatRelated(something, table, where) AS MuchText FROM LotsaText;
其中 MuchText
是备注字段
使用 VBA 和记录集的解决方法:
Dim rsSelect As DAO.Recordset
Dim rsInsert As DAO.Recordset
Dim db As DAO.Database
Set db = CurrentDb
Set rsSelect = db.OpenRecordset ("Select DISTINCT [ImportTable].DSFNum FROM [ImportTable]")
Set rsInsert = db.OpenRecordset("OneRowTable")
Do While Not rsSelect.EOF
rsInsert.AddNew
rsInsert!DSFNum = rsSelect!DSFNum
rsInsert!Item = ConcatRelated("[Item]","[ImportTable]","[DSFNum] =" & rsSelect!DSFNum)
rsInsert!Count = ConcatRelated("[Count]","[ImportTable]","[DSFNum] =" & rsSelect!DSFNum)
rsInsert.Update
rsSelect.MoveNext
Loop
我一直在使用 Allen Browne 的 ConcatRelated()
函数,但我意识到使用更大的数据集时数据不完整。
此函数是否有字符限制,如果有 - 是否有不同的函数/UDF 可以达到相同的结果?
这是函数:- link 返回原始线程 http://allenbrowne.com/func-concat.html
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
编辑
我正在使用 VBA 和 运行 一个 Into
语句。如果我先生成 table 然后插入数据会更好吗?
当前结构
DoCmd.RunSQL "Select DISTINCT [ImportTable].DSFNum,
ConcatRelated('[Item]','[ImportTable]','[DSFNum] =' & [DSFNum]) AS Item,
ConcatRelated('[Count]','[ImportTable]','[DSFNum] =' & [DSFNum]) AS Count
INTO [OneRowTable]
FROM [ImportTable]"
所有相关信息都可以在 ConcatRelated
函数的代码中找到:
- Notes: Returning more than 255 characters to a recordset triggers this Access bug: http://allenbrowne.com/bug-16.html
正如该页面上所见,问题不在于功能,而在于 Access 中的文本字段不能包含那么多字符,可以通过使用
之类的东西来解决SELECT ID, MuchText FROM StructureOnly
UNION ALL
SELECT ID, ConcatRelated(something, table, where) AS MuchText FROM LotsaText;
其中 MuchText
是备注字段
使用 VBA 和记录集的解决方法:
Dim rsSelect As DAO.Recordset
Dim rsInsert As DAO.Recordset
Dim db As DAO.Database
Set db = CurrentDb
Set rsSelect = db.OpenRecordset ("Select DISTINCT [ImportTable].DSFNum FROM [ImportTable]")
Set rsInsert = db.OpenRecordset("OneRowTable")
Do While Not rsSelect.EOF
rsInsert.AddNew
rsInsert!DSFNum = rsSelect!DSFNum
rsInsert!Item = ConcatRelated("[Item]","[ImportTable]","[DSFNum] =" & rsSelect!DSFNum)
rsInsert!Count = ConcatRelated("[Count]","[ImportTable]","[DSFNum] =" & rsSelect!DSFNum)
rsInsert.Update
rsSelect.MoveNext
Loop