Trigger.new
can be accessed in insert
, update
and undelete
triggers, and the records can only be modified in before triggers.
Trigger.old
can be accessed in update
and delete
triggers.
Here all the full details of all of the Trigger Context Variables taken from the Trigger Context Variables documentation.
All triggers define implicit variables that allow developers to access run-time context. These variables are contained in the System.Trigger
class.
isExecuting
Returns true
if the current context for the Apex code is a trigger, not a Visualforce page, a Web service, or an executeanonymous()
API call.
isInsert
Returns true
if this trigger was fired due to an insert operation, from the Salesforce user interface, Apex, or the API.
isUpdate
Returns true
if this trigger was fired due to an update operation, from the Salesforce user interface, Apex, or the API.
isDelete
Returns true
if this trigger was fired due to a delete operation, from the Salesforce user interface, Apex, or the API.
isBefore
Returns true
if this trigger was fired before any record was saved.
isAfter
Returns true
if this trigger was fired after all records were saved.
isUndelete
Returns true
if this trigger was fired after a record is recovered from the Recycle Bin (that is, after an undelete operation from the Salesforce user interface, Apex, or the API.)
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.
newMap
A map of IDs to the new versions of the sObject records.
Note that this map is only available in before update
, after insert
, and after update
triggers.
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.
oldMap
A map of IDs to the old versions of the sObject records.
Note that this map is only available in update
and delete
triggers.
size
The total number of records in a trigger invocation, both old and new.