Check ID Exist and delete record in PL SQL - oracle

Question

What I have to do is, whenever a STORE_CODE is entered it will check in the db and delete the store code. SO for that, I have written a procedure which is as below
PROCEDURE DELETE_STORE_INFO
(
P_STORE_CODE IN NVARCHAR2
)
AS
BEGIN
UPDATE TBL_RRSOC_STORE_INFO set ISACTIVE = 'N' where STORE_CODE = P_STORE_CODE;
END DELETE_STORE_INFO;
But here what missing is
what if the user enter the wrong store_code and does the operation so what it will do. how to check with that part ?
I guess something for COUNT wont work at this stage. Kindly suggest

Answer 1

You want to use SQL%ROWCOUNT to find out how many rows were affected by the previous SQL statement:
PROCEDURE DELETE_STORE_INFO
(
P_STORE_CODE IN NVARCHAR2
)
AS
BEGIN
UPDATE TBL_RRSOC_STORE_INFO
SET ISACTIVE = 'N'
WHERE STORE_CODE = P_STORE_CODE;
IF SQL%ROWCOUNT = 0 THEN
-- DBMS_OUTPUT.PUT_LINE( 'Store code does not exist.' );
RAISE_APPLICATION_ERROR( -20000, 'Store code does not exist.' );
END IF;
END DELETE_STORE_INFO;
/
You can use DBMS_OUTPUT.PUT_LINE( string ) to output to the SQL console (if you are calling this from an external language like PHP or Java then you will not see the output and you may not see it in the console if you have SET SERVEROUTPUT OFF).
You could also use RAISE_APPLICATION_ERROR( error_code, error_message ) to raise an exception if something invalid happens.
Alternatively you could return a status in an OUT parameter:
PROCEDURE DELETE_STORE_INFO
(
P_STORE_CODE IN NVARCHAR2,
O_STATUS OUT NUMBER
)
AS
BEGIN
UPDATE TBL_RRSOC_STORE_INFO
SET ISACTIVE = 'N'
WHERE STORE_CODE = P_STORE_CODE;
IF SQL%ROWCOUNT = 0 THEN
o_status := 0;
ELSE
o_status := 1;
END IF;
END DELETE_STORE_INFO;
/

Answer 2

Generally contract for your procedure is: caller gives some store_code and procedure guarantee that there is no active store with such code. What if caller gives the wrong store_code? It means there is no such store, so contract is accomplished. You should do nothing, no more :)
But if you wish to check whether update found the record or not, you can add something like
if sql%notfound then
dbms_output.put_line('There is no such store!');
end if;
immediately after update statement.
Especially for MT: just check simple script
create table t$(id integer);
insert into t$ values(1);
set serveroutput on
begin
update t$ set id = 2 where id = 1;
if sql%notfound
then dbms_output.put_line('#1: not found');
else dbms_output.put_line('#1: found');
end if;
update t$ set id = 4 where id = 3;
if sql%found then
dbms_output.put_line('#2: found');
else dbms_output.put_line('#2: not found');
end if;
end;
/
drop table t$;
My results are
Connected to Oracle Database 12c Enterprise Edition Release 12.1.0.2.0
#1: found
#2: not found
PL/SQL procedure successfully completed

Answer 3

There are something missunderstand in your request: you said you want to delete it but in the code, you just updated the store as incative.
Here is the proceure with both situation. You choose the right one:
CREATE OR REPLACE PROCEDURE DELETE_STORE_INFO (P_STORE_CODE IN NVARCHAR2) AS
n_count number;
BEGIN
select count(1) INTO n_count from TBL_RRSOC_STORE_INFO where STORE_CODE = p_store_code;
if n_count > 0 then
UPDATE TBL_RRSOC_STORE_INFO set ISACTIVE = 'N' where STORE_CODE = P_STORE_CODE;
-- or for deletion
-- DELETE TBL_RRSOC_STORE_INFO set ISACTIVE = 'N' where STORE_CODE = P_STORE_CODE;
else
DBMS_OUTPUT.PUT_LINE('the required store was not found');
end if;
END DELETE_STORE_INFO;