The “Key Exists” Validator is validator that can be defined at either the entity level or the attribute level but pertains to an entity object attribute to check whether a key exists based on a primary key, foreign key or an alternate key. The “Key Exists” validator will check first the cache querying rows not committed yet to the database and if the key is not found in the cache will run a check in the database.
So let’s start by creating a new ADF Fusion Web Application and create the basic business components that we will be using in this demo, two entity objects based on the Countries and Regions HR tables, their associated view objects and a default application module. Read the complete article here.
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