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Trigger created. The update that failed earlier works now as follows: benchmark@ORA10G> update table 2 ( 3 select parts 4 from components_or_view 5 where component_id = 1 6 ) 7 set part_desc = part_desc || ' or'; 2 rows updated. However, there is more to come. What if we want to replace all parts of a component The following update replaces the entire parts column of the view components_or_view. This fails because we still do not have a trigger on the object view per se (remember, the previous trigger was on the nested table column parts of the object view the difference will be clear in a moment). benchmark@ORA10G> declare 2 l_parts part_type_tab; 3 begin 4 select parts 5 into l_parts 6 from components_or_view 7 where component_id = 1; 8 9 for i in 1 .. l_parts.count 10 loop 11 l_parts(i).part_desc := l_parts(i).part_desc || 'changed'; 12 end loop; 13 14 update components_or_view

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Here s an example of what an update query using this strategy might look like: update authors set au_lname = @au_lname, au_fname = @au_fname, phone = @phone, address = @address, city = @city, state = @state, zip = @zip, contract = @contract WHERE au_id = '123123' and au_lname = @org_au_lname and au_fname = @org_au_fname and phone = @org_phone and (address = @org_address or (address is null and @org_address is null)) and city = @org_city or (city is null and @org_city is null)) and state = @org_state or.

15 set parts = l_parts 16 where component_id = 1; 17 end; 18 / declare * ERROR at line 1: ORA-01732: data manipulation operation not legal on this view ORA-06512: at line 14 For this update to work, we need to create an instead of trigger on the object view that enables update on the object view itself. The logic of the trigger is explained in the interspersed comments. benchmark@ORA10G> create or replace trigger components_or_view_io_update 2 instead of update on components_or_view 3 begin 4 --dbms_output.put_line( 'old component_id: ' ||:old.component_id ); 5 --dbms_output.put_line( 'new component_id: ' ||:new.component_id ); If we are updating the column component_name, we simply update the corresponding relational table component_rel as follows: 6 7 8 9 10 11 case when( updating('COMPONENT_NAME') ) then update components_rel set component_name = (:new.component_name ) where component_id = :old.component_id; when( updating( 'PARTS' ) ) then

Before we begin, let s look more closely at some terminology: Processes are, in the context of this chapter, standard operating system (OS) processes Each instance of the NET CLR runs in its own process, and multiple instances of the NET CLR will often be running on the same machine Threads are, in the context of this chapter, standard NET threads On most implementations of NET these correspond to operating system threads Each NET process has many threads running within the one process Concurrent programs are ones with multiple threads of execution, each typically executing different code, or are at different execution points within the same code Simultaneous execution may be simulated by scheduling and descheduling the threads, which is done by the OS For example, most operating system services and GUI applications are concurrent Parallel programs are one or more processes or threads executing simultaneously.

On the other hand, if we are updating the column parts, then the logic is slightly more complex. Our first step is to remove all records from parts such that they were in the old set but are not there in the new set of records: 16 17 18 19 20 21 22 23 24 25 delete from parts_rel where part_id in ( select part_id from TABLE( cast( :old.parts as part_type_tab ) ) minus select part_id from TABLE( cast( :new.parts as part_type_tab ) ) );