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Re: trigger with condition
Posted by: Martin Tomczyk
Date: November 30, 2013 04:03PM

HI Peter,

ok. I changed some stuff and hopefully done it right :)
The JOIN and my whole concept were wrong I think. I would have needed a full outer join anyway (If I'm right :))
But I started to go the direction you leaded me to with NEW extension of TRIGGER.
So the new code doing it's job the way I want to.
Maybe you could give some comments. I would really appreciate it.
To summarize the task:
#####################DB-SOURCE#####################|		|################DB-DESTINATION###################
#source table (structure identical to destination)#|		|####table (structure identical to source)########
#_______id______|_______introtext_________________#|		|#______id______|___introtext____________________#
#	1	|	varchar of id1 in source  #|---|	|#	1	|   varchar of id1 in destination#
#	2	|	varchar of id2 in source  #|   |------->|#	2	|   varchar of id2 in destination#
#	3	|	varchar of id3 in source  #|		|#	3	|   varchar of id3 in destination#
The only thing that should happen when the trigger fires is that
only the introtext of id=1 in source table
should be copied to
the introtext of id=2 in destination table
And that only if introtext of id=1 in source table is changed.
In any other cases nothing happens. So the code is:
 
	BEGIN
	IF NEW.id = 1 THEN
	UPDATE db_destination.table_content custom_destination
	SET custom_destination.introtext = NEW.introtext
	WHERE custom_destination.id = 2;
	END IF;
	END

Thanks a lot.
Martin



Edited 1 time(s). Last edit at 11/30/2013 04:16PM by Martin Tomczyk.

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