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

Passing Arguments to execlp()
I'm writing a program that mimics a unix shell. It's supposed to take commands with arguments and ex

Must be a string? Huh, what? HELP?
with the following script, I get
Fatal error: Property name must be a string in /home/content/e/

Shuffle Array
Hi,

I am writing a script for a game that needs players to randomly be assigned a target (ano

Creating a custom API
I'm creating a site, and I need to create a basic API. Unfortunately I have no idea where to start.

Keeping track of php uploads
Hello all.

I was looking at the way PHP handles file uploads.
It seems that PHP uses a tem

why does my session end?
my connect.php starts the session just so you know
i can navigate arround my site fine except whe

Dynamically set AccordianPane Header
I have an accordian on my master page. I'd like to be able to dynamically change the header on diff

MASS PM
Hello all, I'm trying to send mass private messages to users in my database but keep getting an erro

filesize() returns 0
I have a socket program that runs in an infinite loop, listening for connections, in this socket I h

"GROUP BY" in arrays
Well i'm looking to do something i usually could do easily using COUNT and GROUP BY if it was a sql