Tree Issue--Data out of order?

Question

All,
I suspect this is more of a generic SQL question, but, anyhow, I'm trying to create a tree report of the items in our bills of materials. When I run the page, the tree is empty (not even a root). Trying to figure out what the problem is, I've copied the SQL into Toad and run it; the results seem to be scrambled, which I suspect is why the tree is failing. Here's the query:
select case when connect_by_isleaf = 1 then 0
            when level = 1             then 1
            else                           -1
       end as status,
       level,
       comp_item_number as title,
       null as icon,
       comp_inventory_item_id as value,
       null as tooltip,
       null as link
from apex.bom_tree_v
where organization_id = 126
start with comp_item_number = 'C70-1039'
connect by prior comp_inventory_item_id = parent_item_id
order siblings by comp_item_numberThe query returns 64 rows for my test item, which is correct, but the top-level item (level = 1) is returned as the 10th row (consistently), rather than the first. All of the documentation I've been able to find indicates that the rows should be returned in hierarchical order.
Anyone have any idea what I'm missing?
-David

Answer 1

Good afternoon David,
Trees in APEX are not even closely populated the same as in Forms. What I did was this:
<li>Query the top of your tree...
<li>Do a UNION ALL SELECT for the next level of your tree
<li> and repeat the UNION ALL SELECT for each indented level of your tree.
Mine looks something like this:
select 'A' id,
        null as pid,
        'Table Of Contents' name,
        NULL link,
        'f?p=&APP_ID.:1:&APP_SESSION.:CONTRACT,A' A1,
        'f?p=&APP_ID.:1:&APP_SESSION.:EXPAND,A' A2
   from dual
  union all
select ltrim(rtrim(to_char(toc_seq_id))) id,
        'A' pid,
        toc_description name,
        'f?p=&APP_ID.:1:&APP_SESSION.:::RP:TOCP:' || toc_seq_id link,
        'f?p=&APP_ID.:1:&APP_SESSION.:CONTRACT,' || TO_CHAR(toc_seq_id) ||'::RP:TOCP:' || TO_CHAR(toc_seq_id) A1,
        'f?p=&APP_ID.:1:&APP_SESSION.:EXPAND,' || TO_CHAR(toc_seq_id) ||'::RP:TOCP:' || TO_CHAR(toc_seq_id) A2
   from my_toc
  where state_id = :P1_STATE
    and toc_level = 1
    and (toc_seq_id < 9
      or  (toc_seq_id < 10 and :P1_User_Type = 2)
      or  (toc_seq_id < 10 and :P1_CUSTOM_USER = 'Y')
      or  (toc_seq_id < 15 and :P1_User_Type > 2 and :P1_CUSTOM_USER != 'Y'))
union all
select ltrim(rtrim(toc_seq_id)) id,
        ltrim(rtrim(toc_parent)) pid,
        toc_description name,
        'f?p=&APP_ID.:' || ltrim(rtrim(to_char((toc_parent+2)))) || ':&APP_SESSION.:::RP:P1_ENTRY_ID:' || toc_entry_id link,
        null a1,
        null a2
   from my_toc
  where state_id = :P1_STATE
    and toc_level = 2
    and (toc_parent < 9
      or (toc_parent = 9 and :P1_User_Type = 2)
      or  (toc_seq_id < 10 and :P1_CUSTOM_USER = 'Y')
      or  (toc_seq_id < 15 and :P1_User_Type > 2 and :P1_CUSTOM_USER != 'Y'))
order by 3,1The code that looks like this:
'f?p=&APP_ID.:' || ltrim(rtrim(to_char((toc_parent+2)))) || ':&APP_SESSION.:::RP:P1_ENTRY_ID:' || toc_entry_id link,is building a link to a page based on the value of the entry (:P1_ENTRY_ID) so the user can click on an entry and jump to that item.
My tree looks like this: (I can't paste an image, so I'll wing it with text - notice my tree started out with
entry zero [0] because I had to add it after the tree was built)
- Table of Contents
  + 0. First branch of my tree
  + 1. Second branch of my tree
  -  2. Third branch - expanded
     +  Entry 1 for third level
     +  Entry 2 for third level
  + 3. Fourth branch of my tree
  + 4. Fifth branch of my treeIt took me awhile to figure all of this out, but once I did, it began to make sense.
The whole idea is that each SELECT will select the next indented level in the tree. Then in the end, use ORDER BY 3,1 to order your tree properly by the parent and then the child within the parent.
I hope this makes sense and that it helps.
Good luck,
Don.
REWARDS: Please remember to mark helpful or correct posts on the forum, not just for my answers but for everyone! :)