What is a trigger?

Pragya Keshap answered on December 17, 2021 Popularity 4/10 Helpfulness 1/10

answer What is a trigger?

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What is a trigger?

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What is a trigger?

Trigger is an event that causes the AWS lambda function to execute. Let’s understand this with an example of API gateway triggers. when an HTTP request comes to the system through the API gateway, then API gateway will trigger the AWS lambda function.

Programming model for AWS Lambda

The lambda programming model has three parts —

Trigger

Handler function

Code

https://medium.com/swlh/execute-a-basic-aws-lambda-function-without-any-triggers-a10af53b03e2

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Contributed on Feb 06 2023

Pragya Keshap

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mysql> SET @sum = 0;
mysql> INSERT INTO account VALUES(137,14.98),(141,1937.50),(97,-100.00);
mysql> SELECT @sum AS 'Total amount inserted';
+-----------------------+
| Total amount inserted |
+-----------------------+
|               1852.48 |
+-----------------------+

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Contributed on Dec 17 2021

Outstanding Osprey

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Trigger

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trigger OppoRecordUpdate on Account (After insert, After update) {
    List<Opportunity> newlist = new List<Opportunity>();
    Set<Id> newset = new Set<Id>();
    for(Account acc : Trigger.new){
         newset.add(acc.Id);
    }
    List<Account> Acclist = [Select Id,Name,(Select Id,Name From Contacts) From Account Where Id =: newset];
    for(Account ac : Acclist){
        for(Opportunity opp : ac.Opportunities){
        opp.Description = ac.Description;
        newlist.add(opp);
        }
    }
    update newlist;
}

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Contributed on Mar 23 2022

gajendra bisen

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trigger

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trigger OpportunityTrigger on Opportunity (before delete, after update) {
    // Run this code for before delete operation.
    if(Trigger.isBefore && Trigger.isDelete) {
        // Get the admin profile.
        Profile adminProfile = [Select Id From Profile Where Name = 'System Administrator' LIMIT 1];
        
        // Iterate through each opportunity and check if the current user's profile is admin
        // and if the opportunity is closed won or closed lost
        // throws the error if the above condition is true
        for(Opportunity opp : Trigger.old) {
            if(System.UserInfo.getProfileId() != adminProfile.Id && (opp.StageName == 'Closed Won' || opp.StageName == 'Closed Lost')) {
                opp.addError('You do not have necessary permissions to delete Closed opportunities.');
            }
        }
    }
    
    // Run this code whenever opportunity is updated
    if(Trigger.isAfter && Trigger.isUpdate) {
        // Get all the Closed Won opportunities which were updated
        List<Opportunity> oportunities = [Select Id, OwnerId, Name, StageName, Account.OwnerId, Owner.Email, Account.Owner.Email
                                          From Opportunity Where Id IN :Trigger.newMap.keySet()
                                          AND StageName='Closed Won'];
        
        if(!oportunities.isEmpty()) {
            // Create an empty list of mail messages which need to be sent.
            List<Messaging.SingleEmailMessage> mails = new List<Messaging.SingleEmailMessage>();
            
            for(Opportunity opp : oportunities) {
                Messaging.SingleEmailMessage emailMessage = new Messaging.SingleEmailMessage();
                
                // Check if Opportunity owner and account owner are same
                // if yes, then set only 1 email address to the 'To Address' so that 2 emails are not sent to the same owner
                // else add email of both owners
                // set subject and text body of the email as well and add the email to list of emails
                if(opp.OwnerId == opp.Account.OwnerId) {
                    emailMessage.setToAddresses(new List<String> {opp.Owner.Email});
                }
                else {
                    emailMessage.setToAddresses(new List<String> {opp.Owner.Email, opp.Account.Owner.Email});
                }
                emailMessage.setSubject('Opportunity - Closed Won');
                emailMessage.setPlainTextBody('Below Opportunity with Opportunity Id and Name is now Closed Won.\n' + 
                                              'Opportunity Id: ' + opp.Id + '\n' +
                                              'Name: ' + opp.Name);
                mails.add(emailMessage);
            }
            // Send list of emails
            Messaging.sendEmail(mails);            
        }
    }
}

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Contributed on Apr 25 2022

Nidhi Mehendale

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GET https://api.streamwish.com/api/file/direct_link?key=45bgyvhlr3nzrcnid&file_code={70bcab2a-70ec-4680-a44c-ee5a382654d5}

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Contributed on Feb 15 2024

Alfonso Lira Zavaleta

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What is a trigger?

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