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  1. #1
    pharmacologist is offline Advanced Beginner
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    Custom function to check if text is in field string and return records where true

    So I'm confused by this and I'm probably doing something stupid but I'm stumped. I have a custom function:

    Code:
    Public Function chemid_infield(SampleID As Integer, chkfield As String) As Boolean
    Dim chkstring As String, fieldstr As String
    
    
    chkstring = "r." & CStr(SampleID)
    
    
    If InStr(1, CStr(chkfield), chkstring) Then
     chemid_infield = True
    Else
     chemid_infield = False
    End If
    
    
    
    
    End Function
    which just checks if a string is in another string and returns true if so and I want to use this as a criteria to return only specific values. I run the query and it looks like it is working, I'm not getting errors, the function goes through each record and returns true when it comes upon a string that has the search string in it. But the resulting table is empty.

    Here is the sql query:

    Code:
    SELECT Plates.PlateID, Plates.Reagents FROM Plates
    WHERE ((chemid_infield(12,[Plates].[Reagents])="True"));


  2. #2
    ranman256's Avatar
    ranman256 is online now VIP
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    Code:
    Public Function chemid_infield(SampleID As Integer, chkfield As String) As Boolean
    Dim chkstring As String, fieldstr As String
    Code:
    
    chkstring = "r." & CStr(SampleID)
    chemid_infield =InStr(chkfield, chkstring)>0 
    End Function
    



  3. #3
    pharmacologist is offline Advanced Beginner
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    Thanks for responding but it's still not returning any records despite the function correctly returning true

  4. #4
    davegri's Avatar
    davegri is online now Excess Access
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    Ranman provided a shorthand version of the function.
    The query should be:
    Code:
    SELECT Plates.PlateID, Plates.Reagents FROM Plates WHERE chemid_infield(12,[Plates].[Reagents])=True;

  5. #5
    pharmacologist is offline Advanced Beginner
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    Ok figured it out. In my sql qry true should not have been in quotes

  6. #6
    pharmacologist is offline Advanced Beginner
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    Quote Originally Posted by davegri View Post
    Ranman provided a shorthand version of the function.
    The query should be:
    Code:
    SELECT Plates.PlateID, Plates.Reagents FROM Plates WHERE chemid_infield(12,[Plates].[Reagents])=True;
    Thanks davegri, I figured it out just before I saw your post!

  7. #7
    davegri's Avatar
    davegri is online now Excess Access
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    High five!

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