One_time only procedure

Question

hi,
what is use of one_time_only procedure,
i have example in which implemented in package .
example..
create or replace package ase
is
do1 number;
end ase;
create or replace package body ase
is
begin
select sal into do1 from emp where empno=7369;
end ase;
variable a number
exec :a := ase.do1;
print a
A
1300
what is purpose of one time procedure please any one help....

Answer 1

Hi,
Like Someoneelse, I'm not sure what you're asking.
There are no procedures of any kind in that package.
When you have a BEGIN section in the package body, then that section is executed once per session, the first time you reference the package. Typically, it is used for set-up, often of package variables 9as in your example) or global temporary tables that are needed elsewhere in the package. If there was something special about employee 7369's salary, and you had to reference that over and over in the package, then it would make sense to declare a package variable (such as do1, though I would suggest a more descriptive name), and set it in the BEGIN section, especially if you can assume that value will not change in the course of the session.
I have one package that sends e-mails where I do exactly that. The name of the e-mail server is located in a table. (I don't want to hard-code it in the package, because my Development database can;t use the same e-mail server as my Production database, and they change about once a year anyway.) I read the name iof the e-mail server once, when I call the package; it looks up the value in the table, and I never have to touch that table again for the rest of the session.
It looks like this "one_time only procedure" question got posted 3 times. That's probably not your fault; this site can be very flaky. To save time and confusion for everyione (including yourself), please mark the other threads
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Edited by: Frank Kulash on Mar 29, 2011 12:52 PM
Added e-mial server example.