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Editorial Team
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Asked: 2026-05-23T02:07:47+00:00

I’ve got a number of tables that share a single auto-incrementing primary key –

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I’ve got a number of tables that “share” a single auto-incrementing primary key – this is accomplished via a trigger on insert which looks like this:

FOR EACH ROW 
    BEGIN
        INSERT INTO master (time) VALUES (NOW());
        SET NEW.id = LAST_INSERT_ID();
    END

This produces the PK for the just inserted row. This does, however, create the problem that I can’t seem to figure out what that ID was. last_insert_id obviously returns nothing as the above statement wasn’t executed on what’s considered “the current connection”.

Is there a way to access the most recently inserted row on a connection without an auto-incrementing primary key?

Update: As a temporary(?) measure I’ve removed the trigger and now generate the ID by making the insert to master within my model. Just seems like it would be nicer if I could somehow return the value that the trigger set.

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1 Answer

  1. Editorial Team

    The doc does say, “For stored functions and triggers that change the [LAST_INSERT_ID] value, the value is restored when the function or trigger ends, so following statements do not see a changed value.”

    Try a stored procedure, which can do your two INSERTS and return the assigned ID.

    Or, give up on doing things the “Oracle way”, drink the MySql Kool-Aid, and just use an auto-incrementing id on the table.

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