Apex Trigger Events|Apex Trigger Exaples

Trigger Examples:

What is Trigger? Trigger is piece of code that is executes before and after a record is Inserted/Updated/Deleted from the force.com database.

Trigger Events: Before Insert, Before Update, Before Delete, After Insert, After Update, After Delete and after undelete.

Example 1:
trigger trigEventsTest on Department__c (before insert,after insert,before update,after update) {
if(Trigger.isInsert)
{
system.debug(‘***IsINSERT*****’);
}
if(Trigger.isUpdate)
{
system.debug(‘******IsUpdate*****’);
}
if(Trigger.isBefore && Trigger.isInsert)
{
system.debug(‘****IsBefore and IsInsert*****’);
}
if(Trigger.isAfter && Trigger.isInsert)
{
system.debug(‘*******IsAfter and IsInsert*****’);
}
if(Trigger.isBefore && Trigger.isUpdate)
{
system.debug(‘*****Before Update******’);
}
}

Example 2:
Account with Multiple Contacts:
trigger Con5Insert on Account (after insert) {
if(Trigger.isAfter)
{
system.debug(‘****New Account Record is ******’+Trigger.new);
Contact objContact ;
List<Contact> lstcon = new List<Contact>();
for(Integer i=1;i<=5;i++)
{
objContact = new Contact(lastname=’AAAAAAAAA’+string.valueof(i),AccountId=Trigger.new[0].Id);
lstcon.add(objContact);
}
system.debug(‘****List Of Contacts *****’+lstcon.size());
insert lstCon;
} }

Example 3:
Trigger.new and Trigger.old
trigger trigEventsTest on Department__c (before update,after update) {
If(Trigger.new[0].name != Trigger.new[0].name)
{
system.debug(‘*****Value Changed******’);
}
else
{
system.debug(‘*****Value did not change******’);
}
}

Example 4:
Add Error:
trigger trigEventsTest on Department__c (before insert) {
if(Trigger.new[0].name==’India’)
{
Trigger.new[0].name.addError(‘Name should not be India’);
}
}

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