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G!R! Interview Question :Reg: Triggers Scenario 1.
Hi All,
How can you handle a circular trigger? will you please explain with sample code please.
scenario: Having Object A and Object B.
In Object A, Lets field be Xyz................................................In Object B, having field ABC
I have written triggers in both objects so that,
If a event occurs in Object A, trigger fires and update a field or something else in Object B. Similarly If a event happens in Object B, ttrigger fires and update a field or something else in Object A-This is called Circluar trigger.
How can we controll this type of trigger.
Thanks
GIRI
The Apex documentation provides a good description of trigger recursion and how to prevent it:
http://www.salesforce.com/docs/developer/cookbook/Content/apex_controlling_recursive_triggers.htm
You can also find other great posts on this topic by doing a Google search for "recursive trigger salesforce".
Hi Chris,
Thnkas for your reply.
But there is difference between Recursive trigger and Circular trigger.
I have been encountered about both the recursive and circular triggers in Interview.
Recursive- event occurs in Object A, trigger fires and update happens in Object B, then again trigger fires in B and change happens in Object C...this is like serial trigger keeps on goes based on relationships.
Circular- between two objects
Correct me If I am Wrong
Hope this will work
Trigger for Object A:
trigger CircularTriggerA on ObjectA (after update) {
List<string> lst = new List<string>();
if(trigger.isupdate){
if(RecursionExampleHandler.isFirstTime){
RecursionExampleHandler.isFirstTime=false;
for(ObjectA obj:trigger.new){
if(obj.Xyz!=null){
lst.add(obj.id);
}
}
}
}
List<ObjectB> objB = new List<ObjectB>();
if(lst.size()>0){
for(ObjectB ob: [select id,ABC from ObjectB{
ob.ABC='anyvalue';
objB.add(ob);
}
}
update objB;
}
Trigger for Object B:
trigger CircularTriggerB on ObjectB (after update) {
List<string> lst = new List<string>();
if(trigger.isupdate){
if(RecursionExampleHandler.isFirstTime){
RecursionExampleHandler.isFirstTime=false;
for(ObjectB obj:trigger.new){
if(obj.ABC!=null){
lst.add(obj.id);
}
}
}
}
List<ObjectA> objA = new List<ObjectA>();
if(lst.size()>0){
for(ObjectA ob: [select id,xyz from ObjectA{
ob.xyz='anyvalue';
objA.add(ob);
}
}
update objA;
}
Recursion Handler class:
public class RecursionExampleHandler {
public static Boolean isFirstTime=True;
public static Boolean isFirstTime1=false;
}
}