Help me on hierarchy

Question

My database versions is 9.2.0.8.0
I need a help on query the order of child records based on parent record and also i want to update the same
order, if any order of parent record changed like 2 to 3 or 1 to 3, i need to update associated record in inherited child record
and continuous records, if any order effects.
let me explain more clearly in data aspects.
here is my table
create table parent_child_link (pc_link_id number,
                                p_order number(9,4),
                                ch_id varchar2(10),
                                p_id number,
                                parent_p_id number,
                    used_date date,
constraint pk_parent_ch_link primary key (pc_link_id));--insert statements
---Parent
insert into parent_child_link values(201,1,'X101',1,null,'05-JAN-2010');
insert into parent_child_link values(202,2,'Y102',1,null,'05-JAN-2010');
insert into parent_child_link values(203,3,'Z103',1,null,'05-JAN-2010');
insert into parent_child_link values(204,4,'A104',1,null,'05-JAN-2010');
insert into parent_child_link values(205,5,'B105',1,null,'05-JAN-2010');
--child
--Inherited from parent record
insert into parent_child_link values(206,1,'E108',2,null,'15-JAN-2010');
insert into parent_child_link values(207,2,'X101',2,1,'05-JAN-2010');
insert into parent_child_link values(208,3,'Y102',2,1,'05-JAN-2010');
insert into parent_child_link values(209,4,'Z103',2,1,'05-JAN-2010');
insert into parent_child_link values(210,5,'A104',2,1,'05-JAN-2010');
insert into parent_child_link values(211,6,'B105',2,1,'05-JAN-2010');
insert into parent_child_link values(212,7,'C106',2,NULL,'15-JAN-2010');
---data looks like
PC_LINK_ID    P_ORDER CH_ID            P_ID PARENT_P_ID USED_DATE
       201          1 X101                1             05-JAN-10
       202          2 Y102                1             05-JAN-10
       203          3 Z103                1             05-JAN-10
       204          4 A104                1             05-JAN-10
       205          5 B105                1             05-JAN-10
       206          1 E108                2             15-JAN-10
       207          2 X101                2          1  05-JAN-10
       208          3 Y102                2          1  05-JAN-10
       209          4 Z103                2          1  05-JAN-10
       210          5 A104                2          1  05-JAN-10
       211          6 B105                2          1  05-JAN-10
       212          7 C106                2             15-JAN-10If i change the order of existing record in parent record,
update parent_child_link set p_order = 5 where pc_link_id = 204;
update parent_child_link set p_order = 4 where pc_link_id = 205;
INSERT into parent_child_link values (213,6,'ZZ11',1,NULL,'15-JAN-2010');
--Data looks like  for parent record
SQL> select * from parent_child_link where p_id = 1 order by p_order;
PC_LINK_ID    P_ORDER CH_ID            P_ID PARENT_P_ID USED_DATE
       201          1 X101                1             05-JAN-10
       202          2 Y102                1             05-JAN-10
       203          3 Z103                1             05-JAN-10
       205          4 B105                1             05-JAN-10
       204          5 A104                1             05-JAN-10
       213          6 ZZ11                1             15-JAN-10       So, my quesion is how do i query in same order for child records cascading this P_ID =1
with out changing order in chiid record
O/p look this
PC_LINK_ID    P_ORDER CH_ID            P_ID PARENT_P_ID USED_DATE
       206          1 E108                2             15-JAN-10
       207          2 X101                2          1  05-JAN-10
       208          3 Y102                2          1  05-JAN-10
       209          4 Z103                2          1  05-JAN-10
       211          5 B105                2          1  05-JAN-10 -- order changed in parent (update)
       210          6 A104                2          1  05-JAN-10 -- order changed in parent (update)
       213          7 ZZ11                2          1  15-JAN-10 -- New record inserted
       212          8 C106                2              15-JAN-10 -- order changed due to new record (update)and how i do update relative order in child records
--similarly if i insert new record in parent, i need to insert same record in child with appropriate order
and updating remaining records, if orders effects.
advance thx
chaitu
Edited by: user12212962 on Jan 15, 2010 11:02 AM
corrected values in parent_p_id field in sample data instead of 10, it should be 1
Edited by: user12212962 on Jan 15, 2010 11:43 AM

Answer 1

I need to update/insert all next level data, when i'm doing update/insert on main level.
Let say, a new record inserted in the main level p_id = 1, i need to insert same record in next level in appropriate position.
same thing for updated record in main level
help me on logic, how to write the code for this, i get all these update/new record's in PL/SQL table(collection object) from front end JAVA application as input parameter to my procedure.
i get only main level (i.e. p_id = 1) transaction records. based on these records, if any next level exists in that table, i need to update/insert records in these next levels as well as main level,
else need to update only main_level.
i've simple logic for processing main_level, but for next level how do i write logic
procedure process_parent_child_link(v_parent_child_link IN type_parent_child, status varchar2)
is
begin
for v_rec in v_parent_child_link.first..v_parent_child_link.last loop
      if v_rec.pc_link_id is null then
           --- insert main level
      --check for next levels
     for v1 in (select distinct p_id
                    from parent_child_link
                     start with parent_p_id =v_rec.p_id
                     connect by prior p_id = parent_p_id) loop
       --   insert next level
     end loop;
    else
           --update main level
           for v1 in (select distinct p_id
                    from parent_child_link
                     start with parent_p_id =v_rec.p_id
                     connect by prior p_id = parent_p_id) loop
                   --   update next level
             end loop;
        end if;
      end loop;
     end;