Add new Validation to Seeded Page

Question

Hi All,
I have a seeded HR Page which uses a non-EO based VO. I want to add some validation to see if the new row being added already exists for the employee. I believe I would need a VVO and VAM to check this.
Since there is no EO to add business logic to, I am thinking of adding it to the CO as I want the to throw an error if the record info already exists.
1) create a VVO and VAM in custom package as xx.oracle.apps.per....schema.server
2) extend the CO , in processFormRequest() , capture the parameters to pass to the VVO,
where do I write the initQuery()/executeQuery() for this VO or call this VVO from ?
what are the exact steps to help achieve this validation or a better way to do it.
Thanks
Shankar

Answer 1

Write this code in processFormRequest()
String procedure = "begin package.Procedure(param1 => :1, param2 => :2); end;";
OADBTransactionImpl oadbtransactionimpl = (OADBTransactionImpl)rootAM.getOADBTransaction();
OracleCallableStatement oraclecallablestatement = (OracleCallableStatement)oadbtransactionimpl.createCallableStatement(procedure, -1);
oraclecallablestatement.set<Parameter>(1, param1);
oraclecallablestatement.set<Parameter>(1, param2);
oraclecallablestatement.execute();
This code you can use , you can some help from developer guide.
Thanks