Rabu, 16 November 2016

Re: [MS_AccessPros] Will Like '*' return records if the value is null?



This is exactly what I was trying to do. I just couldn't find the right example. Thanks for this and thanks for being my teacher. You have taught me so much! I'll get back to work now.


---In MS_Access_Professionals@yahoogroups.com, <JohnV@...> wrote :


Close, but no cigar.  First, I recommend against changing the SQL of qrySearch.  That should be a query with no filters that's the Record Source of the form you're opening.  Then the code to build your filter should look like this:

Dim strSearch As String

   If Not IsNull(Me.txtMSDSID.Value) Then
        strSearch = "MSDSID = '" & Me.txtMSDSID & "' "
    End If
    If Not IsNull(Me.txtProductName.Value) Then
        ' If already have part of a predicate
        If Len(strSearch) > 0 Then 
            ' Add an AND
            strSearch = strSearch & " AND "
        End IF
        strSearch = strSearch & "ProductName Like '*" & Me.txtProductName & "*' "
    End If
    If Not IsNull(Me.cboCategory.Value) Then
        ' If already have part of a predicate
        If Len(strSearch) > 0 Then 
            ' Add an AND
            strSearch = strSearch & " AND "
        End If
        strSearch = "Category = " & Me.cboCategory & " "
    End If 

' … and so on.

Then do:

    DoCmd.OpenForm "frmSearchResults", acFormDS, WhereCondition:=strSearch

And for the close, just do:

    DoCmd.Close acForm, Me.Name

No need to do the acSaveNo.

John Viescas, Author
Effective SQL
SQL Queries for Mere Mortals 
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications 
(Paris, France)

On Nov 16, 2016, at 7:36 PM, winberry.doyce@... [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:

John and Duane,

Here's the bigger picture. The database holds Material Safety Data Sheet records. I'm trying to build a form that will search the records using criteria from some unbound text and combo boxes. The user puts whatever they want in the form then presses the search button which should open another form with the filtered results. They can click whatever record they want and it opens another form and displays the record and a copy of the MSDS that has been scanned and stored on a server. Here is the procedure under for the search button. I haven't got the SQL right yet.

Private Sub btnSearch_Click()
    Dim db As DAO.Database
    Dim qdf As DAO.QueryDef
    Dim strSQL As String
    Set db = CurrentDb
    Set qdf = db.QueryDefs("qrySearch")
    Dim lMSDSID As Variant
    Dim sProductName As String
    Dim lCategory As Variant
    Dim sManufacturer As String
    Dim sChemtrac As String
    Dim sPartNo As String

    If IsNull(Me.txtMSDSID.Value) Then
        lMSDSID = " "
        lMSDSID = " = " & Me.txtMSDSID.Value & " "
    End If
    If IsNull(Me.txtProductName.Value) Then
        sProductName = " Like '*' "
        sProductName = "= Like *'" & Me.txtProductName.Value & "'* "
    End If
    If IsNull(Me.cboCategory.Value) Then
        lCategory = " Like '*' "
        lCategory = "= " & Me.cboCategory.Value & " "
    End If
    If IsNull(Me.cboManufacturer.Value) Then
        sManufacturer = " Like '*' "
        sManufacturer = "= Like *'" & Me.cboManufacturer.Value & "'* "
    End If
    If IsNull(Me.txtChemTrekNo.Value) Then
        sChemtrac = " Like '*' "
        sChemtrac = "= Like *'" & Me.txtChemTrekNo.Value & "'* "
    End If
    If IsNull(Me.txtPartNo.Value) Then
        sPartNo = " Like '*' "
        sPartNo = "= Like *'" & Me.txtPartNo.Value & "'* "
    End If

    strSQL = "SELECT qS.* " & _
             "From qS " & _
             "Where qS.MSDSID" & lMSDSID & _
             "AND qS.ProductName" & sProductName & _
             "AND qS.Category" & lCategory & _
             "AND qS.MName" & sManufacturer & _
             "AND qS.ChemTrekNo" & sChemtrac & _
             "AND qS.PartNO" & sPartNo & ";"

    Debug.Print strSQL
    qdf.SQL = strSQL
    DoCmd.OpenForm "frmSearchResults", acFormDS
    DoCmd.Close acForm, "frmSearch", acSaveNo

End Sub


---In MS_Access_Professionals@yahoogroups.com, <duanehookom@...> wrote :

I agree with John. As zou start building your WHERE condition, you should ignore the columns/fields that aren't relevant.

However, you could use this type of syntax:

WHERE qS.MSDSID & '' Like '*'...


From: MS_Access_Professionals@yahoogroups.com <MS_Access_Professionals@yahoogroups.com> on behalf of winberry.doyce@... [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com>
Sent: Wednesday, November 16, 2016 11:37 AM
To: MS_Access_Professionals@yahoogroups.com
Subject: [MS_AccessPros] Will Like '*' return records if the value is null?

Hello Pros,
I'm building a query on the fly through VBA and if appears that if the values for a field are null, the query won't return the record using criteria Like '*' for the field. Is that a correct? Here is the SQL of the query:
WHERE (((qS.MSDSID) Like '*') AND ((qS.ProductName) Like '*') AND ((qS.Category) Like '*') AND ((qS.MName) Like '*') AND ((qS.ChemTrekNo) Like '*') AND ((qS.PartNO) Like '*'));
In my table there are only 6 records and ChemTrekNo is null for all 6. Using Like '*' as criteria for ChemTrekNo no records are returned. What do I do if I want the records that contain nulls? Wrap it in Nz? What would the SQL look like?


Posted by: winberry.doyce@con-way.com
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