Variable uses and placement

Posted on 16th Feb 2014 07:03 pm by admin

I'm new to PL/SQL and am trying to learn about variable valid uses/placement (any pointers to any docs is appreciated...)
All of the docs I've looked only mention declaration and assignment not valid placement.

When I use an input parameter to a cursor placement matters . I just don't understand why...

example... using the value "SCOTT" as an input parm to the c10 cursor replaces the "str_in" variable correctly and works...

1 declare
2 cursor c10(str_in IN varchar2) is
3 select username
4 from dba_users where username=str_in ;
5 begin
6 for r_c10 in c10('SCOTT') loop
7 dbms_output.put_line(r_c10.username);
8 end loop;
9* end;
SQL> /
SCOTT

PL/SQL procedure successfully completed.

However, when trying to replace another "word" it won't resolve the reference...

example... attempting to replace the from table_name as an input parm, no go...

1 declare
2 cursor c10(str_in IN varchar2) is
3 select username
4 from str_in where username='SCOTT' ;
5 begin
6 for r_c10 in c10('DBA_USERS') loop
7 dbms_output.put_line(r_c10.username);
8 end loop;
9* end;
SQL> /
from str_in where username='SCOTT' ;
*
ERROR at line 4:
ORA-06550: line 4, column 6:
PL/SQL: ORA-00942: table or view does not exist
ORA-06550: line 3, column 1:
PL/SQL: SQL Statement ignored
ORA-06550: line 7, column 26:
PLS-00364: loop index variable 'R_C10' use is invalid
ORA-06550: line 7, column 5:
PL/SQL: Statement ignored

Why can't it resolve the string ?

Any help is appreciated
dumb newbie...

Your Answer:

Login to answer

Other forums

Send current URL in URL with a $_GET variable problem.
Hello community,

I have created a function that gets the current variable of a page, example:

Random date selection
i want to select random date with time(hour+minutes+sec) where date is specified(10/22/2009) and tim

need help modifying script
Hi guys,

I'm fairly new to php and am having a bit of trouble modifying a script.

This

Small problem with image resize script
Hi!

I am a little bit new to php and I have an issue installing an image resize script I down

PHP mail() with images
I'm trying to get images to send along with my HTML e-mail sent through PHP mail(). I only tried vie

ctype() validation - allowing illegal characters
Hello,
I use ctype() to filter and validate a user form. However, I am trying to allow certain c

The page should be expire when cilck back button
hi,
i'm new to php world.
i create user registration page.
when i submit it,data goes to my

issues verifying if user is logged in
I am having issues when a user logs in via asp Login control, the IsAuthenticated still seems to com

how make 2 column in table with data tybe long row
hi every one

I want make in my table 2 column with data tybe long raw

how thi

Will an XHTML DOCTYPE interfere with my PHP if I'm not experienced enough?
I've read this article here: http://friendlybit.com/html/why-xhtml-is-a-bad-idea/

In a nutshe