Apex Intermediate Progress | ( Lessons)

Lesson: 02 | Types of Triggers

Notes

Before triggers are used to update or validate record values before they’re saved to the database.
After triggers are used to access field values that are set by the system (such as a record's Id or LastModifiedDate field), and to affect changes in other records. The records that fire the after trigger are read-only.

Examples:

trigger myAccountTrigger on Account(before insert) {
    for(Account acc: Trigger.New){
        acc.Description ='Test Description';
    }

}

new:

Returns a list of the new versions of the sObject records.
This sObject list is only available in insert, update, and undelete triggers, and the records can only be modified in before triggers.

Trigger.new is a list

Trigger.new[0] or Trigger.new.get(0) is the first record of the Trigger.new list.

trigger myAccountTrigger on Account(before insert)
{
   System.debug(Trigger.New[0].Name + ' is created. ');                              
}

Trigger.new is ussually used in for each loop:

trigger myAccountTrigger on Account(before insert)
{
    for(Account ac : Trigger.new) {
        System.debug(ac+' has been created. ');
    }                             
}

Account ac = new Account(Name='Blue Hotel');
insert ac;

old:

Returns a list of the old versions of the sObject records.
This sObject list is only available in update and delete triggers.

trigger AccountTrigger on Account (before update) {    
    
    System.debug(Trigger.Old[0].Name + ' is updated to: ' + Trigger.New[0].Name);
    
}

Account ac = [SELECT Id, Name from Account WHERE Name ='Blue Hotel' LIMIT 1];
ac.Name='New Blue Hotel';

update ac;

Exercises

#	Exercise
1	Create a Lead Trigger that updates the value of Rating
2	Create a trigger which updates the description of the related opportunities of an account whose probability is greater than 50:
3	Update Description when an Account is created or updated
4	Update Account's Billing Country as USA for America or AMERICA values
5	Automatically Copy Mailing Address to Other Address When "Mailing Address Is Same As Other Address" is Checked
6	Update billing country to USA if entered as America
7	Create a trigger that determines if the account name has changed
8	Create a contact related to Account if Create Contact Field is Checked
9	Update the description of the related opportunities of an account
10	Create an Opportunity related to Account Object
11	Update Annual Revenue
12	Avoid deletion of the account with a contact
13	Update Contact Description Upon Insertion or Update
14	Create Opportunity On Lead Conversion
15	UpdateAccountBillingAddress
16	Delete Inactive Accounts
17	Debug the number of Deleted Accounts
18	Update description when the Name of an Account is updated
19	Update Phone Number of the Contacts when an Account is updated
20	Prevent Duplicate Contact Creation
21	Prevent Account Deletion
22	Updating Last Contact Date on Account When Contacts Are Added or Updated in Salesforce
23	Automatically Set Case Status and Priority for Email-Originated Cases
24	Automatically Set Lead Rating Based on LeadSource
25	Automatically Create Associated Contact Record for New Account
26	Automatically Create Associated Contact Record for New Consulting Account
27	Automatically Create Multiple Contact Records Based on Number of Contacts Specified on Account Object
28	Update Account with Latest Opportunity Amount
29	Update Opportunity Stages on Account Deactivation

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Apex Intermediate

A. Apex DML Operations (8 lessons)

B. Apex Classes (17 lessons)

C. Apex Triggers (9 lessons)

D. Apex Exceptions (11 lessons)

E. Asynchronous Apex (6 lessons)

F. SOSL (10 lessons)

G. Testing Apex (9 lessons)

H. Apex Fast Recap (142 lessons)

I. Build Apex Coding Skills (64 lessons)

J. Miscellaneous (17 lessons)

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Lesson: 02 | Types of Triggers

Notes

new:

old:

Apex Intermediate