Solved

How do I prevent a recursive Interbase trigger

Posted on 2010-09-23
2
1,238 Views
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.
0
Comment
Question by:PilotAdmin
2 Comments
 
LVL 19

Accepted Solution

by:
NickUpson earned 500 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






0
 

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!
0

Featured Post

VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Database tuning – How to start and what to tune. This question is frequently asked by many people, both online and offline. There is no hard and fast rule-of-thumb for performance tuning, however, before beginning the tuning process one should a…
CCModeler offers a way to enter basic information like entities, attributes and relationships and export them as yEd or erviz diagram. It also can import existing Access or SQL Server tables with relationships.
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question