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...

No comments posted yet

Your Answer:

Login to answer
344 Like 49 Dislike
Previous forums Next forums
Other forums

Passing variables with pagination - iterating through unique id per link
Hi everyone,
I have seen a few topics like this one. Still cant find the specific thing, so I am

pass form variables straight to email, no database required?
hello all,

im working on this form...

http://www.adobedayevents.com/project_request/pr

Unique Visitor Tracking
Hello. Currently, I run a voting site where voters are tracked by their IP address and can only vote

Problems with array
This code is the last lines in an upload script that uploads 4 images at the same time and writes th

Asset Transfer from One plant to another within same company code
Hi,

Please advise how to transfer one asset from one plant to another plant within same c

Parse XML
Good day,

I use oempro software and try to parse XMLReturn but it's not working for me, simpl

question about header() security
is is safe to just use the header() function to redirect someone if they are, say, not logged in? or

Search with relational database
Hey,

I have quite a complicated (for me anyway ) relational database for an apartments syste

Not loading image
When this function gets loaded it doesn't load the image just trying to figure out why.

Code:

How do I replace any number of character occurences with one occurrence?
How do I replace any number of character occurences with one occurrence?

Let's say I have:

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash