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

Keeping data in form
How can I keep whatever I write in the form?

Using real time in php
I'm very average at PHP and im looking to introduce time to something on my site.
Its a sports si

Putting double spaces instead of single spaces
Im looking at trying to replace all single spacing between fields with double spacing

At pres

Displaying a clickable playername
I am going wrong somewhere with the mysql_query, can someone please put me straight?

$playern

Get dump of MySQL DB from Live Site
I'm after an easy, but secure way of generating and importing a MySQL dump from a remote server.

Transaction variant for VA02 not working
My requirement is to have transaction for user to only add the output and print a sales order.

Executing an exe
Hi. I have some bizarre problem with exec (other any other method) to launch exe's. I am making a ga

Help with email validation please...
Hi,
Please could you help.
I have a register.php login page where users register, the detail

2 things: enter doesn't work in IE & empty form
i have this search form that works well except for 2 things.

1) on IE when i hit enter instea

Echo multiple lines of html code
Hi guys,

I would like to know if there is a way to echo multiple lines of html codes.

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