How to suppy and get the results from a procedure dynamically.

Question

Hi all,
I have a simple procedure, which should prompt five times for
values and display the values dynamically. but it is not
behaving like that. while compilation it is asking for the
value, once i enter the value , it is prompted that procedure
created. while executing, it is diplaying all five same values
what i have entered at compilation time. Please check out. Here
is the code.
create or replace procedure test is
t_var integer;
t_count integer := 0;
begin
loop
t_var := &r;
dbms_output.put_line('The value is: ' || t_var);
If t_count = 5 Then
     Exit;
End If;
t_count := t_count + 1;
end loop;
End;
Regards,
G. Rajakumar.

Answer 1

See now what happens is
When u use &variable in sql or plsql it tries to substitute with
the value held by that variable. If it dosent find that value in
that session then it prompts for one. (that is why ur proc asks
for value only once)
What happens in your proc is
fisrt time it will ask for &r value, but subsequent i will not
ask because when second time it tries to do &r in your prog it
finds the value that u had entered above. Also as u said that
prog takes the input and dosent show anything this is cos sql
engine takes the value and compiles the proc it actucally shows
when u run it. U can have look at the below executed program
In this once u have eneterd say value 199 then it display 199
for those many number of times. I hope this answers your
question.
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure test is
2 t_var integer;
3 t_count integer := 0;
4 begin
5 loop
6 t_var := &r;
7 dbms_output.put_line('The value is: ' || t_var);
8 If t_count = 5 Then
9 Exit;
10 End If;
11 t_count := t_count + 1;
12 end loop;
13* End;
SQL> /
Enter value for r: 12
old 6: t_var := &r;
new 6: t_var := 12;
Procedure created.
SQL> exec test
The value is: 12
The value is: 12
The value is: 12
The value is: 12
The value is: 12
The value is: 12
PL/SQL procedure successfully completed.
SQL>