on update current_timestamp with SQLite

Question

I want to update a field with the current timestamp whenever the row is updated.

In MySQL I would do, when declaring the table

LastUpdate TIMESTAMP D         


        

Answer 1

John is correct about the default SQLite settings, this trigger leads to an infinite loop. To avoid recursion, use the WHEN clause.

Following will work even if the recursive_triggers setting is on:

PRAGMA recursive_triggers=1;     --- test

CREATE TRIGGER [UpdateLastTime]
    AFTER UPDATE
    ON package
    FOR EACH ROW
    WHEN NEW.LastUpdate < OLD.LastUpdate    --- this avoid infinite loop
BEGIN
    UPDATE Package SET LastUpdate=CURRENT_TIMESTAMP WHERE ActionId=OLD.ActionId;
END;