Hi guys,
This is my first blog,
so please correct my if I am wrong somewhere,
Here the simple but tricky question asked in many interviews
of salesforce because it’s a common scenario comes many times that’s why I’m
writing this,
Suppose you have to update a record in a trigger with
after update event then what happens???
Here example:
trigger
updateAccount on Account (after update) {
List<Account> accList = new List<Account>();
for (Account a : Trigger.new) {
// some logic……
//…………………………….
accList.add(a);
}
update acclist;
}
If you execute the above code then, the trigger is recursively
called and thoughts exception
“CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY,
updateAccount: maximum trigger depth exceeded ”
Because you trying to do updation in trigger which is also
updating same record so it called itself again and again and again upto its limit,
Here the solution of this problem,
1 1. Make a public class.
2 2.
In that class take a static Boolean variable.
3 3. Then create a static method, which has if
statement which returns true first time only.
Code:
-->> A class with static boolean variable and method:-
public
class runOnce{
public static Boolean firstRun =
false;
public static Boolean run(){
if(!firstRun){
firstRun = true;
return firstRun;
}
return false;
}
}
-->> Now change in
trigger,
trigger
updateAccount on Account (after insert, after update) {
if(runOnce.run()){
List<Account> accList = new
List<Account>();
for (Account a : [Select ID from
Account where Id in :Trigger.new]) {
// some logic……
//…………………………….
accList.add(a);
}
update acclist;
}
}
Hope it helps, Happy Coding...:)
Anurag Jain
