Database.QueryLocator Class

The following table lists the method for the Database.QueryLocator class.

Name	Return Type	Description
`getQuery`	String	Returns the query used to instantiate the Database.QueryLocator object. This is useful when testing the `start` method. For example: System.assertEquals(QLReturnedFromStart. getQuery(), Database.getQueryLocator([SELECT Id FROM Account]).getQuery() ); You cannot use the `FOR UPDATE` keywords with a getQueryLocator query to lock a set of records. The `start` method automatically locks the set of records in the batch.
`iterator`	Database. QueryLocatorIterator	Returns a new instance of a query locator iterator. Warning To iterate over a query locator, save the iterator instance that this method returns in a variable and then use this variable to iterate over the collection. Calling `iterator` every time you want to perform an iteration can result in incorrect behavior because each call returns a new iterator instance. For an example, see Database.QueryLocatorIterator Class.