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Prevent Duplicate Records in Grid

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  • Prevent Duplicate Records in Grid


    This should be easy, but i cannot seem to work it out or find the answer within the forum.

    I have a grid which allows you to add/edit data for the 'tbl_i_owners' table. I have two fields


    I want to create three rules when adding data to this table;

    1) Only allow one Driver (Owner_Role) per Ins_ID number.
    2) Only allow two Passengers (Owner Role) per Ins_ID number.
    3) Allow any amount of Other (Owner_Role) per Ins_ID number.

    Can anyone offer any assistance with this.

    Thanks in advance.


  • #2
    Re: Prevent Duplicate Records in Grid

    With a Grid, you need to use the BeforeInsertRecord event to test the table for existing conditions, and abort with a message if the entry is not allowed. I'd use the exists() function to test. The only thing I don't like about this is the person may have spent time creating the record only to find out they are not allowed to insert it.
    Steve Wood
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    • #3
      Re: Prevent Duplicate Records in Grid

      I'd love to see a Grid attribute for setting the max of rows that can be Inserted.

      What would you think about that?
      Frank R


      • #4
        Re: Prevent Duplicate Records in Grid


        Thanks Steve.

        I have seen this from Steve Workings which has been written for a dialog. I need the same thing but need to refer to two character fields ('Ins_id' and 'Owner_Role') within a grid.

        query.filter = "First = '" + alltrim(currentform.controls.vFirst.value) + "' .and. Last = '" + alltrim(currentform.controls.vLast.value) + "'"
        query.order = ""
        t ="[pathalias.adb_path]\customer.dbf")
        qdx = t.query_create()
        if qdx.records_get() > 0
           CurrentForm.Has_Error = .t. 
           CurrentForm.Error_Message = "You've already registered." 
        end if
        This also from Selwyn which seems to also do the trick, but again i need this to work within a grid.

        function CanInsertRecord as v (DataSubmitted as P, Args as p, PageVariables as p, Result as p)
        with PageVariables
        if tablecount("[PathAlias.ADB_Path]\gifts","giftid=" + quote(datasubmitted.giftId)) > 0 
        Result.Cancel = .t.
        Result.ErrorHTML = "Gift has already been given"
        end if
        end with
        end function
        Can anyone show me how i can use either of these to prevent duplicate records based on two fields within my grid.

        Thanks in advance.