string-concatenation


Error in ConcatRelated


Here is my table structure:
ID1 - autonumber
TDate - Date/Time
TTime - Date/Time
TID - Text
TMessage - Text
Tcode - text
TMessage value can be 100+ characters. There can be more than 1 TMessage for each TID
Sample input:
TDate TID TTime TMessage
1/9/2014 93378 12:28:28 PM aaaaaaaaaaaa
7/24/2014 02645 12:56:22 PM bbbbbbbbbbbb
7/24/2014 02645 12:56:30 PM cccccccccccc
Output should be:
TDate, TID, TMessage
1/9/2014 93378 aaaaaaaaaa
7/24/2014 02645 bbbbbbbbbb,cccccccccccc (the output can be more than 255 chars.)
This is my query/module (got from Stackoverflow and Allen Brown)
Query (SQL View)
SELECT sub.TDate, sub.TID, ConcatRelated("[TMessage]","RawData2","[TDate] = '" & sub.TDate & "' AND [TID] = '" & sub.TID & "'","[TDate], [TID]") AS concat_Message
FROM (SELECT q.TDate, q.TID FROM RawData2 AS q GROUP BY q.TDate, q.TID) AS sub
ORDER BY sub.TDate, sub.TID;
Function :
Option Compare Database
Public Function ConcatRelated(strField As String, _
strTable As String, _
Optional strWhere1 As Date, _
Optional strWhere2 As String, _
Optional strOrderBy1 As Date, _
Optional strOrderBy2 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 strWhere1 <> vbNullString And strWhere2 <> vbNullString Then
strSql = strSql & " WHERE " & strWhere1 And strWhere2
End If
If strOrderBy1 <> vbNullString And strOrderBy2 <> vbNullString Then
strSql = strSql & " ORDER BY " & strOrderBy1 And strOrderBy2
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
Currently, this is the output:
TDate TID Concat_Message
1/9/2014 93378 #Error
7/24/2014 02645 #Error
7/24/2014 04533 #Error
Question 1 - What could be the reason for the Error? How to solve it?
Question 2 - Can I just create a table manually with Memo field so I can store the result of the Query to this table?

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