What are the context variables in apex trigger in salesforce | apex trigger | salesforce development
In an Apex trigger in Salesforce, context variables provide essential information about the records being processed, enabling dynamic and responsive code. Key context variables include Trigger.new, which contains the list of new records being inserted or updated, and Trigger.old, which holds the old versions of records before an update or delete operation. Maps of these records, Trigger.newMap and Trigger.oldMap, allow quick access by record IDs. The variables Trigger.isInsert, Trigger.isUpdate, Trigger.isDelete, and Trigger.isUndelete help identify the type of operation that triggered the execution. Additionally, Trigger.isBefore and Trigger.isAfter determine whether the trigger runs before or after the records are saved to the database. Trigger.size gives the total number of records processed, supporting bulk operations. These context variables are crucial for writing effective and context-aware triggers.
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