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Any mySQL guru here that can help me with an UPSERT ?

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  • Any mySQL guru here that can help me with an UPSERT ?

    In my scenario i have SourceOrderProducts and TargetOrderProducts tables with similar structures.
    SourceOrderProducts : SourceLinePKID, OrderID, CatalogID, Quantity, Amount
    TargetOrderProducts: TargetLinePKID, OrderID, CatalogID, Quantity, Amount
    Those are target to a one to many where the parent is the Orders table.

    I need to run an UPSERT from the Source to the Target, as follows:
    - if Source OrderID and CatalogID exist in Target, update fields Quantity and Amount in the target
    - if Source OrderID does not exist in Target, insert all rows from Source with that OrderID
    - if Target OrderID and CAtalogID does not exist in Source, delete it from Target table.

    In Sql server , this is doable with one MERGE command. How is it done in mySQL? I've read about INSERT ...on DUPLICATE but don't have the required level to write the correct UPSERT command


  • #2
    Re: Any mySQL guru here that can help me with an UPSERT ?

    Is this a one time merge you are trying to do or is it something that you will do every time one or the other table is modified?

    If this is a one time thing, you should be able to do it will three SQL commands.

    If this is NOT a one time thing, I would do it by creating triggers. The only problem might be your Target does not exist in Source requirement. You can't delete from the same table you are triggering from. So you might have to do that one in xbasic or by running a separate stored procedure after insert/update. But I don't know the specifics of what you are doing here.

    If you are interested in help on this, send me a private message or maybe someone else will have a better idea.


    • #3
      Re: Any mySQL guru here that can help me with an UPSERT ?

      In this case i already have a web service that retrieves records from the Source table for a specific OrderID.
      I then need to run the UPSERT in the Target table.
      This whole is triggered at a user request (Ajax callback)

      If i don't find a mySql solution i'll indeed manually write all the commands for each request. Not very elegant but doable and it will work...


      • #4
        Re: Any mySQL guru here that can help me with an UPSERT ?

        As I said, most of this could be done inside a trigger. MYSQL has very good trigger support. (Though it is different from MSSQL.)

        If you can write the command for the request, you can likely turn that command into a trigger on the source table.


        • #5
          Re: Any mySQL guru here that can help me with an UPSERT ?

          I see. Im writing all the commands right now will see how to turn it into a trigger afterwards


          • #6
            Re: Any mySQL guru here that can help me with an UPSERT ?

            If you google UPSERT mysql, (at least when I did) it will take you to the MySQL manual for ON DUPLICATE KEY UPDATE. Basically, you set up a unique key in the table that will reject the duplicate key, then create an insert command with an ON DUPLICATE KEY UPDATE parameter, and then specify how to do the update. I use a stored procedure for that.
            Pat Bremkamp
            MindKicks Consulting


            • #7
              Re: Any mySQL guru here that can help me with an UPSERT ?


              I think this should be done:
              Mysql after_insert_trigger AND after_update_trigger on source table
              Source is called NEW in syntax

              INSERT INTO targetorderproducts (orderid, catalogid,Quantity,amount) VALUES (new.orderid, new.catalogid, new.quantity, new.amount)
              ON DUPLICATE KEY UPDATE quantity=new.quantiy,amount=new.amount;

              ofcourse orderid and catalogid must be a unique key in the table target.

              Mysql after_delete_trigger on source table
              Source is called OLD in syntax
              delete from targetorderproducts
              where orderid = old.orderid and catalogid = old.catalogid limit 1;


              • #8
                Re: Any mySQL guru here that can help me with an UPSERT ?

                Thanks guys, it's working flawlessly