Procedure need for SQL Query (Oracle) - sql

Question

I am a bit stuck on this to be honest, and I cant find a nice solution. No solution at all.
I have this table actor(id,Actor_Name) where the name is formatted as Actor-01 .. etc:
id Actor_Name
--------------------
01 Actor-01
02 Actor-02
03 Actor-03
What I need is, to increase the name of every one of these actors by one, using a procedure . Like this:
id Actor_Name
--------------------
01 Actor-02
02 Actor-02
03 Actor-04
Probably I need some kind of iteration , and I have tried a bit with cursors, but its mostly a disaster. If Anyone could provide some neat solution , or something I would be really happy!

Answer 1

I don't think you need a cursor. I'm not 100% sure about desired format, but something like
select CAST(REGEXP_SUBSTR('Actor-01','[[:digit:]]+')as int) from dual; returns 1 that can be incremented and stored (for instance UPDATE table1 set col1 = 'Actor-0' || CAST(REGEXP_SUBSTR(col1,'[[:digit:]]+')as int)+1 WHERE ....

Answer 2

Here are some concepts that may point toward a workable solution.
You can use INSTR to find the position of the minus sign.
SELECT INSTR('ACTOR-74','-') FROM DUAL
You can use SUBSTR to pull off the DIGITS
SELECT SUBSTR('ACTOR-74', 6) FROM DUAL
You can use TO_NUMBER to turn the digits into a number
SELECT TO_NUMBER('1234') FROM DUAL
You can use concatenation to build a replacement value
SELECT SUBSTR('ACTOR-74',1,6) ||
TO_CHAR(74 + 1, '09') FROM DUAL
Which yields a value that can be used in the update.
UPDATE TABLE
SET ACTOR_NAME = the-replacement-value

Answer 3

Try something like (not tested)
update actor set actor_name = 'Actor-' || lpad( to_char( id + 1), 2, '0' );
commit;

Answer 4

No need for a procedure.
merge into actor
using (
select id,
substr(actor_name, 1, instr(actor_name, '-')) as name,
to_number(substr(actor_name, instr(actor_name, '-') + 1)) as nr
from actor
) t on (t.id = actor.id)
when matched then update
set actor_name = t.name || to_char(nr + 1, 'FM09');
SQLFiddle example: http://sqlfiddle.com/#!4/93c02/1

Answer 5

Another approach:
update (select id
, replace( Actor_name
, substr(actor_name, -2)
, To_char(to_number(substr(actor_name, -2)) + 1, 'fm00')
) as New_Actor_name
, Actor_name
from actor
) a
set a.actor_name = a.new_actor_name;
SQLFiddle Demo

Answer 6

Using a stored procedure for such a simple task seems like overkill.
update ACTOR
set substr(ACTOR_NAME,1,length(ACTOR_NAME)-2)||to_number(substr(ACTOR_NAME,-2,2))+1
where substr(ACTOR_NAME,-2,2) between '00' and '99'

Answer 7

You may have been close using a cursor, but probably didn't know that cursors are READ-ONLY by default. To toggle this behavior, use the for update option in your cursor defintion:
http://www.techonthenet.com/oracle/cursors/for_update.php
(an additional explanation of the for update clause)
Then when looping through the cursor, you need to also use a clause which allows you to update the record last fetched by the cursor: where current of
http://www.techonthenet.com/oracle/cursors/current_of.php
("where current of" examples)
This should work with both anonymous pl/sql blocks or by a stored procedure definition.