How to remove data in three tables at once with the same key.

I am new to Oracle ADF, I have a requirement like these, I have three tables such as employee salaries, teams of all these have a common EmpNo as common attribute, I have the search form these returns all employees related to this search query, when I click on the button Delete the particular employee data should delete all tables of the three based on the EmpNo.



Any help is appreciated...

(1) the easiest way is to mark the constraints of foreign key to WAGES employees and TEAMS of EMPLOYEES like ON DELETE CASCADE. The DB server then removes the necessary lines each time you remove a line from the employee.

(2) another way is to implement a Before delete e-DB trigger on the EMPLOYEES table, where you can remove the related rows in other tables (have in mind that if you have foreign keys you can get an Exception Table mutation, so this approach is perhaps not very good).

(3) an ADF is to implement a custom EntityImpl class for the Employee entity and substitute the remove() method where you can find the related entities of TeamMember and salary (via EntityAssoc accessors) and call remove() methods too.

(4) another way of the ADF is to implement a custom EntityImpl class for the Employee entity and override the doDML() method where you can remove the lines needed in SALARIES and TEAMS through JDBC calls tables whenever a DELETE operation is performed on the Employee of the underlying entity.

Dimitar

Tags: Java

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