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Handling Active-Link Table Duplicate Primary Key

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    Handling Active-Link Table Duplicate Primary Key


    I'm a new A5 user but have a lot of experience with Delphi.

    I have a primary employee id key (EmpID) in an active-link table made up of the first 3 characters of the last name and a two digit character string, like "SMI00" for Smith. The underlying SQL Server table has the EmpID field as nchar(5).

    With Delphi, if another employee with same last name was entered, my code would initially try to post "SMI00", and when unsuccessful, increment the two digit part, and then post "SMI01".

    I attempted to use "On error goto" to trap for a duplicate primary key, but the server error apparently always interrupts the script, and I can't maintain control within my code.

    Do any of you have any suggestions on a way to trap for a duplicate key and then update the key and try to repost?

    Thanks in advance for you help, and my compliments to the Alpha team for an outstanding product in v9.


    Re: Handling Active-Link Table Duplicate Primary Key

    You wouldn't be using an active link table with a web grid in the first place - try setting up a grid based on one: you can't, because that's not what they are there for.

    How unique IDs are handled depends on your database, each SQL database has different ways of assigning unique/autopincrement IDs...


      Re: Handling Active-Link Table Duplicate Primary Key

      Perhaps I should also have mentioned that this is in a windows desktop application, not a web application.
      What I'm really looking for is to find out if there is any way to programatically handle the server error "Duplicate Primary Key" within the Alpha programming environment.


        Re: Handling Active-Link Table Duplicate Primary Key

        Originally posted by gkpurcey View Post
        Perhaps I should also have mentioned that this is in a windows desktop application, not a web application.
        What I'm really looking for is to find out if there is any way to programatically handle the server error "Duplicate Primary Key" within the Alpha programming environment.
        Ah I see - it was posted in the Application Server forum, maybe you can get it moved so more folk can respond :)

        It depends how you set up the SQL database though, you might be able to do that side of things entirely at the database end so it doesn't matter WHERE data is entered from (Alpha desktop, Alpha web app, another form of data entry etc.)

        Within Alpha5, you could set a field rule to calculate the ID field or to fire on a data entry event. Look at sql_record_get() or similar - in the field rules for the active link table, you can set up rules for caculated field values or for events like when a record is entered, saved etc.


          Re: Handling Active-Link Table Duplicate Primary Key

          Oops... sorry about that... I'll repost in the right location. Thanks