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sql code to sort dconcat

Posted on 2010-11-18
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Last Modified: 2012-05-10
The first code sample links on a text field (ancestor number) and sorts the contents of the dconcat on each record based on child date of birth.

The second code sample links on an integer field(ancestorCID) but I can't figure out how to parse the syntax to accomplish sorting the contents of the dconcat by date of birth (as they are in the top sample.)  I keep getting invalid syntax errors.  I just can't figure out what all those " and ' are for!

Thanks, Karen
Children: "Children:" & " " & Nz(DConcat("[Child First Name],[child date of birth], [Child Spouse Name]","[ancestor children]","[Ancestor Number] = '" & [Ancestor Number] & "'","; "," ",True," [child date of birth] ASC "),"")



ListChildren2: "Children:" & Nz(DConcat("[Child First Name], [child date of birth], [Child Spouse Name]","[ancestor children]","[AncestorCID] = " & [AncestorCID]),"")

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Question by:ksilvoso
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What is "DConcat"? Is that a function you built? If so, can you post the code for that function?
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by:ksilvoso
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Here's the code.  Thanks again to MatthewsPatrick who built the code.

Option Compare Database
Option Explicit

Function DConcat(ConcatColumns As String, tbl As String, Optional Criteria As String = "", _
    Optional Delimiter1 As String = "; ", Optional Delimiter2 As String = " ", _
    Optional Distinct As Boolean = True, Optional OrderBy As String = "", _
    Optional Limit As Long = 0)
   
    ' Function by Patrick G. Matthews, basically embellishing an approach seen in many
    ' incarnations over the years
   
    ' Requires reference to Microsoft DAO library
   
    ' This function is intended as a "domain aggregate" that concatenates (and delimits) the
    ' various values rather than the more usual Count, Sum, Min, Max, etc.  For example:
    '
    '    Select Field1, DConcat("Field2", "SomeTable", "[Field1] = '" & Field1 & "'") AS List
    '    FROM SomeTable
    '    GROUP BY Field1
    '
    ' will return the distinct values of Field1, along with a concatenated list of all the
    ' distinct Field2 values associated with each Field1 value.
   
    ' ConcatColumns is a comma-delimited list of columns to be concatenated (typically just
    '   one column, but the function accommodates multiple).  Place field names in square
    '   brackets if they do not meet the customary rules for naming DB objects
    ' Tbl is the table/query the data are pulled from.  Place table name in square brackets
    '   if they do not meet the customary rules for naming DB objects
    ' Criteria (optional) are the criteria to be applied in the grouping.  Be sure to use And
    '   or Or as needed to build the right logic, and to encase text values in single quotes
    '   and dates in #
    ' Delimiter1 (optional) is the delimiter used in the concatenation (default is ", ").
    '   Delimiter1 is applied to each row in the code query's result set
    ' Delimiter2 (optional) is the delimiter used in concatenating each column in the result
    '   set if ConcatColumns specifies more than one column (default is ", ")
    ' Distinct (optional) determines whether the distinct values are concatenated (True,
    '   default), or whether all values are concatenated (and thus may get repeated)
    ' OrderBy (optional) indicates how to sort the results.  The argument value should consist
    '   of an entire ORDER BY clause (without the actual words "ORDER BY"), or be omitted
    ' Limit (optional) places a limit on how many items are placed into the concatenated string.
    '   The Limit argument works as a TOP N qualifier in the SELECT clause
   
    Dim rs As DAO.Recordset
    Dim SQL As String
    Dim ThisItem As String
    Dim FieldCounter As Long
   
    On Error GoTo ErrHandler
   
    ' Initialize to Null
   
    DConcat = Null
   
    ' Build up a query to grab the information needed for the concatenation
   
    SQL = "SELECT " & IIf(Distinct, "DISTINCT ", "") & _
           IIf(Limit > 0, "TOP " & Limit & " ", "") & _
            ConcatColumns & " " & _
       "FROM " & tbl & " " & _
      IIf(Criteria <> "", "WHERE " & Criteria & " ", "") & _
      IIf(Trim(OrderBy) <> "", "ORDER BY " & OrderBy, "")
     
    ' Open the recordset and loop through it:
    ' 1) Concatenate each column in each row of the recordset
    ' 2) Concatenate the resulting concatenated rows in the function's return value
   
    Set rs = CurrentDb.OpenRecordset(SQL)
    With rs
        Do Until .EOF
           
            ' Initialize variable for this row
           
            ThisItem = ""
           
            ' Concatenate columns on this row
           
            For FieldCounter = 0 To rs.Fields.Count - 1
                ThisItem = ThisItem & Delimiter2 & Nz(rs.Fields(FieldCounter).Value, "")
            Next
           
            ' Trim leading delimiter
           
            ThisItem = Mid(ThisItem, Len(Delimiter2) + 1)
           
            ' Concatenate row result to function return value
           
            DConcat = Nz(DConcat, "") & Delimiter1 & ThisItem
            .MoveNext
        Loop
        .Close
    End With
   
    ' Trim leading delimiter
   
    If Not IsNull(DConcat) Then DConcat = Mid(DConcat, Len(Delimiter1) + 1)
   
    GoTo Cleanup

ErrHandler:
   
    ' Error is most likely an invalid database object name, or bad syntax in the Criteria
   
    DConcat = CVErr(Err.Number)
   
Cleanup:
    Set rs = Nothing
   
End Function
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by:Patrick Matthews
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Karen,

We're probably going to need a sample database to figure this one out.  Please be sure to purge it of confidential/sensitive information first.  Please post that file in the MDB format; many Experts here, myself included, do not always have an Access 2007/2010 instance available to them.  (I do have one, but not on my primary computer.)

Also, some tips that might make it easier for you in the future:

Any time your question relates to a query, always post the full SQL statement.  Without the full SQL statement, it is often difficult to discern what the end goal is
Posting a sample database always helps.  The sample need not be large, and you should take care to eliminate or obfuscate confidential/sensitive information before posting it, because the search engines will index the file
If the question involves anything having to do with VBA, be sure to post the source code for all of the procedures/functions you are asking about.  Such is the case here
If your question is related to something you found elsewhere, such as in a previous EE question, an EE article or blog post, or some other web page, include a URL to that material
If your question is at all related to previous questions you have asked (and indeed, you have asked a couple of questions about DConcat before), it is a good idea to go back to that older question, and use the 'ask a related question' link.  When you do that, EE automatically sends alerts to all Experts who subscribed to the original question

Cheers,

Patrick
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by:aikimark
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by:ksilvoso
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MatthewsPatrick
  Thanks for the helpful info.  My current question relates to these 2 previous questions:

http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_26490150.html
http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_26525770.html

I am putting together a sample database and will submit it with my next post.

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by:ksilvoso
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I have uploaded the database: ForEE.mdb
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by:ksilvoso
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qryAncestorFamily is the relevant query.
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by:ksilvoso
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Sorry, the title of my question should say "sql code to sort dconcat"
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ksilvoso earned 0 total points
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Well I changed my sql code to:

ChildrenSortedByAgeLinkedOnTextField: "Children:" & " " & Nz(DConcat("[Child First Name],[child date of birth], [Child Spouse Name2]","[qryancestorchildren]","[Ancestorcid] = " & [Ancestorcid] & "","; "," ",True," [child date of birth] ASC "),"")

I removed the single apostrophe in a couple of places and that took care of it.  Thanks anyway
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by:Patrick Matthews
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Karen,

My apologies, the end of the week got extremely busy for me at work.

I am very, very pleased to see that you got this sorted out on your own :)

Cheers,

Patrick
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by:ksilvoso
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Thanks Patrick!
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by:ksilvoso
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I googled the meaning of double apostrophe and single apostrophe in sql and asp code and tweaked the code until it worked.  Since my question was solved I didn't want to leave it open and have other people devoting their time to it so I accepted my own answer.
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