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How do I prevent a recursive Interbase trigger

Posted on 2010-09-23
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Last Modified: 2013-12-09
How do I update multiple rows in a table using a trigger without encounting a recursive trigger scenario? For instance, you change the price for an item in Group 1, the idea would be for the trigger to set the price for every other item in the table in Group 1 to the same price. However, this is an easy scenario to encounter a recursive trigger when running an update statement on the same table. Any ideas on how to accomplish this with a trigger or trigger/procedure?

Example:

Item     Price     Group
Item1   1.00      1
Item2   2.00      2
Item3   1.00      1

Edit price for Item 1 to 3.00 should also change Item3 to 3.00.
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Question by:PilotAdmin
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NickUpson earned 1500 total points
ID: 33752300
in an after update trigger

if exists (select 1 from mytable where group = new.group and price <> new.price)) then
  update mytable set price = new.price where group = new.group;

this is untested pseudo code, but you should get the idea






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Author Closing Comment

by:PilotAdmin
ID: 33798466
After update suggestion worked.. had to manage it a bit different due to the example I provided being a little oversimplified (we have a lot more going on in the price table that I didn't go into), but it did get me going down the right track. Thanks!
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