Batch Class Salesforce - Apex- Salesforce Development

Learn the batch class syntax by creating a first batch class in the developer console, implementing database.batch, and defining start, execute, and finish methods with practical examples.

This lecture explains the standard batch class structure in Apex, showing how start, execute, and finish methods use database query locator to fetch account records and test queries.

Create an instance of your batch class and run it from the anonymous window by calling database.executeBatch with the instance and, if needed, the batch size.

Open the setup, search for Apex Jobs, and view the status to verify batch class execution, including submitted time, completed time, and the job ID.

See how batch execution starts with the start method retrieving records, with debug logs showing the execute method work, and ends with the finished method, while batch size shapes calls.

Explore how a batch class updates the number of employees field on all account records to seven, illustrating the requirement implementation and alternatives like data loader.

Implement a Salesforce batch class to update account records, replacing data loader steps, by writing start, execute, and finish methods and updating the number of employees field.

Discover how the start method fetches records and passes them to execute via scope, enabling bulkification of account updates. Implement logic to loop over accounts, set fields, and update.

Learn to monitor Apex batch jobs by querying asynchronous job status with get job ID, track completed, processed, and total items, and email results when the batch finishes.

Break down a Salesforce batch class design to auto-create follow-up tasks for closed opportunities with no open tasks. Set the task due date to 15 days from today.

Implement a batch Apex class named opportunity task creation to generate follow-up tasks for closed opportunities lacking open tasks, with a 15-day due date and query-based processing.

Identify open tasks connected to opportunities, collect related IDs, query for open tasks, and create a new task only if no open task exists for that opportunity.

Create an Apex batch to generate open tasks linked to opportunities. Populate mandatory fields—status, subject, and priority—and set due dates 15 days from today, using bulkification and batched inserts.

Learn how batch class statuses in Salesforce indicate progress and outcomes, including completed, failed, aborted, and processing. Note that there is no fixed order, and check them in Apex Jobs.

Discover how the Apex flex queue restricts to five bad jobs running or queued, how excess jobs are held, and how priority reorder guides execution when resources free up.

Understand the batch class status lifecycle, from waiting for execution to queued and preparing. See how execution starts, processing proceeds, and outcomes like completed, failed, or aborted influence the lifecycle.

Apply best practices when writing batch classes to manage triggers, queues, and system limits, including five active jobs, asynchronous apex calls, and optimal batch size.

Learn why you cannot call a future method from a batch class and how to implement call out in batch processes, using a handler class and best practices.

Learn how batch classes run as independent transactions, with each batch resetting government limits and processing in batches. Understand what happens when a batch fails and how batches stay committed.

Explore how batch jobs in Salesforce run in discrete transactions, using batch size and a counter to track executions, and learn how stateful databases preserve batch state across runs.

Explore how stateful batch classes retain counters across batch executions using database.stateful, compare non-stateful behavior, and analyze finished method outputs to ensure correct batch processing.