Trigger Events :
Events are the database activities which fires a trigger, this again is required for a trigger. So by this we can say Trigger is Apex Code that gets executed before and after of these operations.
- Insert : Before and After
- Update : Before and After
- Delete : Before and After
- Merge : Not directly, but both insert and delete trigger get fired for winning and losing records.
- Upsert : Not directly, but both insert and update trigger gets fired
- Undelete : After
Trigger Events : Before Insert , After Insert , Before Update , After Update
Trigger Context Variables :
Trigger.New
Trigger.Old
Trigger.NewMap
Trigger.OldMap
Trigger.isinsert
Trigger.Isupdate
Trigger.isDelete
Trigger.isbefore
Trigger.isafter
Variable | Description |
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. |
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.) |
Structure trigger like this :
Writing single trigger on a object is preferable always . Please make sure your using the trigger events conditions and manage your code well .
before update , after delete , before delete )
{
if (Trigger.isBefore)
{
if (Trigger.isInsert)
{
// Logic to be executed for Before Insert
}
if (Trigger.isupdate)
{
// Logic to be executed for Before Update
}
if (Trigger.isDelete)
{
// Logic to be executed for Before Delete
}
}
if (Trigger.isAfter)
{
if (Trigger.isInsert)
{
// Logic to be executed for After Insert
}
if (Trigger.isupdate)
{
// Logic to be executed for After Update
}
if (Trigger.isDelete)
{
// Logic to be executed for After Delete
}
}
}
Thank you
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