How can i Delete the data from three tables at a time using same key.

Question

I am New to Oracle ADF, I have a Requirement Like these, I have three tables like Employee,Salaries,Teams all of these are having one common EmpNo as common attribute, I have Search form these will return the all the employees related to that search query, when i click on Delete button the particular employe Data should delete from all the three tables based on the EmpNo.
Any Help is appreciable..

Answer 1

1) The easiest way is to mark the foreign key constraints from SALARIES to EMPLOYEES and from TEAMS to EMPLOYEES as ON DELETE CASCADE. The DB server will then delete the necessary rows whenever you delete an employee row.
2) Another way is to implement a Before-Delete-Row DB trigger on the EMPLOYEES table where you can delete the related rows in the other tables (have in mind, that if you have foreign keys you may get a Mutating Table Exception, so this approach might be not very good).
3) An ADF way is to implement a custom EntityImpl class for the Employee entity and to override the remove() method where you can lookup the related TeamMember and Salary entities (through EntityAssoc accessors) and invoke their remove() methods too.
4) Another ADF way is to implement a custom EntityImpl class for the Employee entity and to override the doDML() method where you can delete the necessary rows in SALARIES and TEAMS tables through JDBC calls whenever a DELETE operation is being performed on the underlying Employee entity.
Dimitar