Bit #16 - Removing a row from a query collection without deleting it from the database

There are times when you want to remove a row from a query collection (the query result) without actually removing it from the database. The query collection - oracle.jbo.server.QueryCollection - gets popullated each time the View is executed - when the View's associated query is run, and represents the query result. While the Row.remove() will remove the query collection row it will also remove the underlying Entity row - for an Entity-based View - and post a deletion to the database. If your programming task requires that the row is removed from the query collection only, i.e. removing a table row in the UI without actually posting a delete to the database, use the Row method removeFromCollection() instead. Just be aware that each time the View is re-executed the Row will show up once again!

Example:

        // in the context of the ApplModuleImpl

        // remove the current row from the query collection
        EmployeesRowImpl employee = (EmployeesRowImpl)(this.getEmployees().getCurrentRow());
        employee.removeFromCollection();

        // the employee row has been removed from the result set and cannot be used anymore


Context:

Application Module Implementation Class
View Object Implementation Class