List: From: Artem Koutchine Date: January 26 2001 6:02pm Subject: Re: If exists UPDATE else INSERT I've seen something about this in the manual. At the moment the problem was how to call such an SQL command (like REPLACE for DELETE/INSERT).

I wonder if it was implemented in 3. Audio Ucenje Engleskog Jezika on this page. 23.32 or is it only in 4.x? ----- Original Message ----- From: 'Jan Willamowius' To: Sent: Friday, January 26, 2001 7:34 PM Subject: If exists UPDATE else INSERT >I'm have a lot of queries where i have to check if a record exists >and if it does, increment a counter in it (most of the time).

Need For Speed Rivals Tpb Torrent more. If exists then update else insert. ELSE insert into users. Update Query in Mysql is very slow and need help in writing stored procedures code for getting. Update, Else Insert, followed by addition of IDs to linking table. ON DUPLICATE KEY UPDATE for your first query.

If it doesn't >exist I insert a new record with counter=1 (this case is rare). >>Right now I do a select form Perl and then do one or the other. >To speed things up I could always do an INSERT IGNORE and always an UPDATE. >This would save one statement on the INSERT case, but that is rare anyway.

>>I'd really like to do this in one (fast) statement, since this is a >real time application with literally milions of UPDATEs that come in >this way every day. >>Would it be possible to write a UDF to do this? >>Cheers, >Jan >-- >Jan Willamowius, jan@ stripped, >Caution: Penguin Inside!

>>-------------------------------------------------------------------- - >Before posting, please check: >(the manual) >(the list archive) >>To request this thread, e-mail >To unsubscribe, e-mail >Trouble unsubscribing? Try: >>Thread • • Re: If exists UPDATE else INSERT Artem Koutchine 26 Jan • •.

Programa Ares Exe Gratis. The way I always do it (assuming the data is never to be deleted, only inserted) is to • Firstly do an insert, if this fails with a unique constraint violation then you know the row is there, • Then do an update Unfortunately many frameworks such as Hibernate treat all database errors (e.g. Unique constraint violation) as unrecoverable conditions, so it isn't always easy. (In Hibernate the solution is to open a new session/transaction just to execute this one insert command.) You can't just do a select count(*).

As even if that returns zero, and therefore you choose to do an insert, between the time you do the select and the insert someone else might have inserted the row and therefore your insert will fail. Hi Adrian, I'm just thinking about a case where the UPDATE statement is only valid if the data has not changed since the attempted INSERT, and there are multiple processes performing the inserts and updates. Unless all inserts and updates to the table are synchronized, sometimes the UPDATE may succeed and sometimes it may fail depending on how the processes interleave. It seemed like such a corner case to me until I was required to perform UPDATEs that are only valid if the state of the data since the last read is still the same. – Feb 25 '13 at 15:13.