Trigger.New and Trigger.Old are both the context Variables which returns records in Lists. Trigger.New => works for the NEW values that are entering either it may be Insert or Update. Trigger.Old=> works for the OLD values that are already in the Fields, it may be to Delete or Update the records.
********************#########################*********************************** Trigger.old: Returns a list of the old versions of the sObject records.
Note that this sObject list is only available in the update and delete triggers.
Trigger.oldMap: A map of IDs to the old versions of the sObject records. Note that this map is only available in the update and delete triggers.
Trigger.new : Returns a list of the new versions of the sObject records. Note that this sObject list is only available in insert and update triggers, and the records can only be modified in before triggers.
Trigger.old : Returns a list of the old versions of the sObject records. Note that this sObject list is only available in update and delete triggers.
trigger MyTrigger on Account (before update) { List<Account> newTriggers = Trigger.new; List<Account> oldTriggers = Trigger.old; System.debug('We want to set the heap dump marker here'); }
Trigger.New and Trigger.Old are both the context Variables which returns records in Lists. Trigger.New => works for the NEW values that are entering either it may be Insert or Update. Trigger.Old=> works for the OLD values that are already in the Fields, it may be to Delete or Update the records.
********************#########################*********************************** Trigger.old: Returns a list of the old versions of the sObject records.
Note that this sObject list is only available in the update and delete triggers.
Trigger.oldMap: A map of IDs to the old versions of the sObject records. Note that this map is only available in the update and delete triggers.
Hi Arvind, Salesforce provides Trigger.OldMap where records with the older version (last version of record committed in the database) are stored in the map with key as their Salesforce record Ids.
Trigger.OldMap = Map<Id, OldVersionOfRecord>();
I have put an example below to show that how can we use Trigger.OldMap and Trigger.New context variables to compare the field values, because the Id of the record is common in both Trigger.OldMap and Trigger. New, that’s why we can use the record Id to get older and newer version of any record from these maps.
Here in this example, trigger compares the account number field’s old value with the new value. That is, trigger checks if the account number was changed. If the account number is changed the trigger assigns the Type field value as “prospect” else it assigns it a value as “Other“.
trigger Compare_OldandNewvalues on Account (before update) {
//Here we will iterate on trigger.new list, which already holds the new values of all records.
for (Account acc: Trigger.new) {
//Here we use the account id, to get the older version of record.
Account oldAccount = Trigger.oldMap.get(acc.ID);
//once we get the older version, we can get any field's value from older version to compare.
if(acc.AccountNumber != oldAccount.AccountNumber) {
//Here is some logic being performed on a condition basis.
System.debug('--*Account Number is changed*--');
System.debug('**Old Account Number :'+oldAccount.AccountNumber);
System.debug('**New Account Number :'+acc.AccountNumber);
acc.Type = 'Prospect';
}
else{
System.debug('--**Account Number has not been Updated**--');
acc.Type = 'Other';
}
}
}
Also, please note that the Trigger.oldMap is only available in the update and delete events and cannot be accessed in insert event triggers. Please mark as best answer if it helps you.
In Salesforce, Trigger.New and Trigger.Old are two context variables that provide access to the new and old versions of records in a trigger operation.
Trigger.New is a context variable that contains a list of new versions of records that are being inserted or updated in the trigger operation. This context variable is useful for accessing the updated fields and values of the new records.
On the other hand, Trigger.Old is a context variable that contains a list of old versions of records that were previously in the database before the trigger operation. This context variable is useful for accessing the fields and values of the records before they were updated or deleted.
Insummary, Trigger.New is used to access the new versions of records that are being processed in a trigger operation, while Trigger.Old is used to access the oldversions of the records before they were updated or deleted. These context variables are important for developing effective Salesforce triggers, as they enable you to compare the old and new versions of records and perform necessary actions based on the differences between them.
I recommend visiting https://arrify.com/triggers-in-salesforce/ to learn more about triggers in Salesforce. This article provides an ultimate guide on Salesforce triggers, including tips and best practices for trigger development.
Trigger.New and Trigger.Old are both the context Variables which returns records in Lists.
Trigger.New => works for the NEW values that are entering either it may be Insert or Update.
Trigger.Old=> works for the OLD values that are already in the Fields, it may be to Delete or Update the records.
********************#########################***********************************
Trigger.old: Returns a list of the old versions of the sObject records.
Note that this sObject list is only available in the update and delete triggers.
Trigger.oldMap: A map of IDs to the old versions of the sObject records. Note that this map is only available in the update and delete triggers.
suppose you have a custom object Custom_obj__c
Trigger.old means it is a List<Custom_obj__c>
Please mark as best answer if it helps you.
Thank You
All Answers
Trigger.old : Returns a list of the old versions of the sObject records. Note that this sObject list is only available in update and delete triggers.
https://developer.salesforce.com/forums/?id=906F00000008yMCIAY
Trigger.New and Trigger.Old are both the context Variables which returns records in Lists.
Trigger.New => works for the NEW values that are entering either it may be Insert or Update.
Trigger.Old=> works for the OLD values that are already in the Fields, it may be to Delete or Update the records.
********************#########################***********************************
Trigger.old: Returns a list of the old versions of the sObject records.
Note that this sObject list is only available in the update and delete triggers.
Trigger.oldMap: A map of IDs to the old versions of the sObject records. Note that this map is only available in the update and delete triggers.
suppose you have a custom object Custom_obj__c
Trigger.old means it is a List<Custom_obj__c>
Please mark as best answer if it helps you.
Thank You
Salesforce provides Trigger.OldMap where records with the older version (last version of record committed in the database) are stored in the map with key as their Salesforce record Ids.
Trigger.OldMap = Map<Id, OldVersionOfRecord>();
I have put an example below to show that how can we use Trigger.OldMap and Trigger.New context variables to compare the field values, because the Id of the record is common in both Trigger.OldMap and Trigger. New, that’s why we can use the record Id to get older and newer version of any record from these maps.
Here in this example, trigger compares the account number field’s old value with the new value. That is, trigger checks if the account number was changed.
If the account number is changed the trigger assigns the Type field value as “prospect” else it assigns it a value as “Other“.
Also, please note that the Trigger.oldMap is only available in the update and delete events and cannot be accessed in insert event triggers.
Please mark as best answer if it helps you.
Shubham Nandwana.
AppPerfect Corp.
salesforce@appperfect.com
408-252-4100
http://www.appperfect.com/services/salesforce/
Salesforce Development & Operations Experts
In Salesforce, Trigger.New and Trigger.Old are two context variables that provide access to the new and old versions of records in a trigger operation.
- Trigger.New is a context variable that contains a list of new versions of records that are being inserted or updated in the trigger operation. This context variable is useful for accessing the updated fields and values of the new records.
- On the other hand, Trigger.Old is a context variable that contains a list of old versions of records that were previously in the database before the trigger operation. This context variable is useful for accessing the fields and values of the records before they were updated or deleted.
In summary, Trigger.New is used to access the new versions of records that are being processed in a trigger operation, while Trigger.Old is used to access the old versions of the records before they were updated or deleted. These context variables are important for developing effective Salesforce triggers, as they enable you to compare the old and new versions of records and perform necessary actions based on the differences between them.I recommend visiting https://arrify.com/triggers-in-salesforce/ to learn more about triggers in Salesforce. This article provides an ultimate guide on Salesforce triggers, including tips and best practices for trigger development.