Become an Expert in Salesforce Apex Triggers | JanBask Training

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Essentials to Become an Expert in Salesforce
Apex Triggers
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Introduction
Triggers are scripts in Apex that get executed
either before or post the happening of specific
DML (data manipulation language) events.
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objective

• Introduction
• Key Points of Triggers
• Trigger Syntax Code
• Events in Trigger Syntax
• Types of Triggers
• Key Consideration
• Trigger Exceptions
• Bulk Triggers
• Context Variables
• Conclusion

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Key Points of Triggers
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Trigger Syntax Code
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Events in Trigger Syntax

• Before insert
• Before update
• Before delete
• After insert
• After update
• After delete
• After undelete

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Types of Triggers
After Triggers They are used for accessing the
field values which are earmarked by the system.
It is also useful in affecting changes in other
records. Every record which actually fires the
after the trigger is a read-only record.
Before Triggers They are basically used for both
the validation and update of various values
before they have been saved in the database.
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Key Consideration

• Upsert triggers are used for firing triggers both
  prior to the insert and even post the insert. It
  can also fire before or after the update
  triggers, whichever scenario fits better.
• Merge triggers, likewise are used for firing both
  before and after the delete for the records which
  are losing. It can also fire for both prior to
  and post the update triggers for the records
  which are winning.
• It has been seen that the triggers that are
  executed post records are not deleted only end up
  working with certain particular objects.
• There is no recording of the field history till
  the trigger ends.
• The tracking of field history is subject to the
  permissions of the user, and if the latter does
  not have the suitable permissions but ends up in
  activating the trigger which makes some change to
  the object or field which has tracking enabled
  for history, no changes will be made in the
  history.
• All kinds of callouts have to be made
  asynchronously from a trigger so as not to block
  the trigger process until there is no response
  for the external service.

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Trigger Exceptions

• Triggers are also used for the prevention of DML
  operations from taking place by calling on the
  addError() method either on a record or a field.
  
• New Records in both the insert and update
  triggers, and also on Trigger.
• Old Records in delete triggers, the custom error
  message shows up on the interface of the
  application, and it is also logged.

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Bulk Triggers
Bulk triggers are helpful in the handling of both
solo record updates and other kinds of bulk
operations, for instance

• Import of Data
• Bulk API calls on the Lightning platform
• Bulk or mass actions
• Other kinds of recursive methods in Apex can call
  DML statements in bulk

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Context Variables

• isExecuting
• isInsert
• isUpdate
• isDelete / isUndelete
• isBefore / isAfter
• new / old
• newMap / oldMap
• operationType
• size

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Conclusion

• Knowledge of the basic aspects of the Apex
  triggers by taking some suitable training and
  certifications
• So you are able to address the core issues in the
  same
• JanBask Training has state of the art training
  modules which address all these core points along
  with many other vital aspects of Salesforce to
  prepare you for the future.

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