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Calculated Field Expression that includes auto increment ID field...

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    Calculated Field Expression that includes auto increment ID field...

    Hi all,
    I am trying to generate a document number that is a concatenation of 4 fields within the record. Three of the fields are populated via the link relationship definition and the last field is the auto incremented ID field for the current (new) record that is also auto filled. I placed the following in the client side calculated field expression: so_id + "-" + sc_id + "-" + chain_id + "-" + contract_id (contract_id is auto incremented). Because the auto incremented field is first in the grid it forces the calculation to fire immediately and results in capturing only 3 of the 4 fields values.

    Is there a better way to execute?

    I played around with the afterInsertRecord event and was not successful. My thanks in advance.
    Kim Dickerman

    #2
    Re: Calculated Field Expression that includes auto increment ID field...

    I think AfterInsertRecord is the way to go you would have to do a lookup of the last entry and update it with your concat. Or if you are using a sql you could set up a trigger that fires when the record gets inserted into the table.
    Chad Brown

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      #3
      Re: Calculated Field Expression that includes auto increment ID field...

      Thanks Chad, I like the TRIGGER recommendation. Makes sense to me to do this back on the server... I am using MYSQL and do not have experience here. I use Navicat in addition, after setting up the trigger on the table (pl_commission) I am receiving the following error:

      1442 - 'Can't update table 'pl_commission' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.'

      Can you give me some insight into this error? It is saying there is another statement invoking same and this is my first trigger?
      Kim Dickerman

      Comment


        #4
        Re: Calculated Field Expression that includes auto increment ID field...

        Are you doing an after insert trigger? Which I think is the proper one.
        Chad Brown

        Comment


          #5
          Re: Calculated Field Expression that includes auto increment ID field...

          Hi Chad,
          Yes here is what I came up with:

          DROP TRIGGER `gen_doc_num`;

          CREATE DEFINER=`root`@`localhost` TRIGGER `gen_doc_num` AFTER INSERT ON `pl_commission` FOR EACH ROW UPDATE pl_commission
          SET doc_num = (concat(so_id, "-" , sc_id, "-" , chain_id, "-" , contract_id));

          I am getting 1442 error: 1442 - 'Can't update table 'pl_commission' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.'

          Researching the error I see: "Within a stored function or trigger, it is not permitted to modify a table that is already being used (for reading or writing) by the statement that invoked the function or trigger."

          Because I am totally new on trigger/stored procedures could you give me insight on the principals of approaching to determine WHERE to place the trigger as well as WHAT errors I may have. If you cannot create a trigger on the table that needs modification do you place the trigger on the parent? Or, do you need to create a virtual table (NEW) to move data into, create the result, and then back in to the OLD table?
          Kim Dickerman

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