Containers are an incredibly powerful technology that can provide you and/or your engineering team with huge productivity gains. Using containers, you can deploy, back up, replicate, and move apps and their dependencies quickly and easily.
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
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
Join the community of 500,000 technology professionals and ask your questions.