Trigger

Trigger-salesfroce

Trigger:

Trigger is also same as stored procedures and if whenever DML operation performed against s-object or view.

There are two types supported by salesforce

·        Object-level

·        record-level

Object-level:

In object-level triggers body of the trigger executed only ones for    

Object.

Record-level:

In record-level trigger body executed for each row (record) based on DMLStatements (input/output)

Qualifiers:

       Be entitled to a benefit or privilege by fulfilling a necessary condition

·         new

·         old

Level trigger

New- 

         Insert          

         Update    

Old-   

         Update       

         Delete

                                                 

Trigger actions:

·        before(old)

·        after(future)

Trigger are using in the collections are receives the data

·        List

·        Set

·        Map

·        For-each

·        For

Trigger Definition

trigger validateTimecard on Timecard__c(before insert, before update) {

 code block

}

Q: what are the trigger events? Next post

Trigger-salesfroce-1

Trigger Context Variables: 11

 Triggers define implicit variables that allow developers to access runtime context. These variables are contained in the System. Trigger class:

Note: is-Boolean (true/false)

Variable Usage:

isExecuting:

 Returns true if the current context for the Apex code is a trigger, not a Visualforce page, a Webservice, 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.