PL/SQL Function to check user name and password

Question

Hi,
I am new to PL/SQL. I have a table that stores user name and password. I want to write a PL/SQL function that checks if the entered user name and password is correct, by validation against the values in the table... Can someone help me with the code? Both user name and password is varchar2

Answer 1

First of all, I believe you mean a procedure that would check the application username and password. Fot, if you mean a PL/SQL procedure, that runs in the database, and that means it has to be executed after the client application is connected to the database.
Maybe you need a procedure like this:
procedure check_pass(p_user varchar2, p_pass varchar2) is
pragma autonomous_transaction;
v_passwd varchar2(200);
begin
select passwd into v_passwd
from password_table
where user_name=p_user;
if v_passwd!=p_pass then
update password_table set
last_unsucc_logon=sysdate
,unsucc_logon_n=nvl(unsucc_logon_n,0)+1
where user_name=p_user;
commit;
raise_application_error(-20101,'Invalid username/password!');
end if;
exception
when no_data_found then
raise_application_error(-20101,'Invalid username/password!');
end;
Study this piece of code and see if this will do.