RowID , RowNum and Number Key???

Question

Dear Gurus
I have a Little problem which I want to know for my personal knowledge and share with forum.
I have recently developed small scale Inventory Management System using Form6i and Database 9.2. I have created three tables for cash sale e.g. CashMaster, Cashdetail and Cashdetdetail. Also for credit sale, three table
CreditMaster, CreditDetail and Creditdetdetail and so on (lots of other tables, just for this problem I am considering two types of tables Cash and Credit).
As the name suggested CashMaster is Master table, CashDetail is Detail table of CashMaster and CashDetDetail is again Detail table of CashMaster (One Master 2 Details Logic).
I have used trigger at CashMaster block level to calculate and populate the Cash Bill No to three tables as follow
(I didnot used sequence to generate CashBillNo as controling it a bit dificult and then you hae to put further check on Form success & saving it .... )
Trigger Name:When New Block Instance
Level: Block Level
Item: CSBILLNO (CashMaster Bill No)
select (nvl(max(csbillno), 0) + 1) into :cashmaster.csbillno from cashmaster;
select (nvl(max(csbillno), 0) + 1) into :cashdetail.csbillno from cashmaster;
select (nvl(max(csbillno), 0) + 1) into :cashdetdetail.csbillno from cashmaster;
Compile and save it and there are no issues. Even while executing the form there is NO ISSUE (All Master Detail & Detail are taking input and saving it).
But when I look into these tables in database using the cammand
SQL> select rowid, rownum, csbillno from cashmaster;
It generates following output
ROWID ROWNUM CSBILLNO
AAAHbhAABAAAMZCAAA 1 3
AAAHbhAABAAAMZCAAB 2 1
AAAHbhAABAAAMZCAAC 3 2
AAAHbhAABAAAMZCAAD 4 4
Similarly it is doing with CreditMaster. After 4 or 5 records it starts Aappending the records rightly at right place as shown above in record 4 (Rowid, RowNum and Record no should be equal or Something else ).
I want to know why it is happening and what is the solution.
Thanks in advance!!!
Best Regards
Thunder

Answer 1

try the following
create table p1 (id number, dscr varchar2(8));
begin
fo i in 1 .. 70000 loop
insert into p1 (id, dscr) values (i,i);
end loop;
commit;
end;
try from a gui sql (such as sql developer, toad)
select rowid, rownum, id, dscr;
truncate p1;
re populate the table using the above script
chk again the data
drop table p1;
repeat
i think you'll be suprised of what the db is doing...
WE (developers-dba) have no control of where exactly the data are going to be stored in the tablespace/block/file
the only way to be sure from forms and any other front end tool about the order
of the the records that will be displayed to end user
is to use explicitly the "order by" clause
(or the order property of the block from builder)
the order of that the forms will submit the insert stmnts depends where commit_form/commit is used
if you use commit_form on a when-new-record-instance at the form level
will commit each record after any navigation to a different record/block
if you have on a form 2 unrelated blocks and you make
insert into first block
update into second block
delete first block
insert second block
and then either the user presses commit or upon trigger exec
forms will submit all the changes of one block
and then all the changes of the other
if you want a mechanism to ensure that data are displayed in the same order they are inserted in the db
you have to use extra column to hold a sequence and/or timestamp