Learning Apex Programming

Bigger, better, and batchier

The Database.Batchable interface can be a lifesaver when dealing with large datasets. As there is a limit on the number of callouts that can occur in a single transaction, the Batchable interface is often used to sync data with outside systems. In order to perform a callout from an implementation of the Database.Batchable interface, you need to make a small tweak to your class definition. In addition to implementing the Database.Batchable interface, you must also implement the Database.AllowCallouts interface, shown as follows:

//Apex Class that implements the Batchable interface
global class contactBatch implements Database.Batchable<SObject>, Database.AllowCallouts {
  ...
}

Your code to perform callouts can occur in ...