Question

In an application I’m building I use a lot of insert on duplicate key updates. My issue is that in my application I kind of need to know whether or not it was an insert or an update so my code can make the appropriate decisions. Does anyone know how I can test for this?

I’m using perl’s DBI module if anyone knows a way specific to that. Thanks!

Answer 1

Per the documentation:

With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if
the row is inserted as a new row and 2 if an existing row is updated.

So, you should be able to check the return-value of the INSERT .. ON DUPLICATE KEY queries; if it’s 1, the row was inserted, if it is 2, it was updated.