Question

I have a table called login with a username and password both encrypted by using ENCRYPTBYPASSPHRASE

However when I insert a new login account I want to check wether the new login username doesn’t exist already.

How can I check wether a username already exists in the database?

I’ve tried stuff like select * from login where username = encryptbypassphrase('username', 'passphrase') but that came out negative.

Answer 1

I would expect something like these to be used:

--- For INSERT
insert into login
  (username, encryptedphrase)
values
  ('username', encryptbypassphrase('username', 'passphrase'))

--- Checking a specific username, passphrase combination:
select * 
from login 
where username = 'username' 
  and encryptedphrase = 
      encryptbypassphrase(username, 'passphrase')

--- Checking if a specific username already exists:
select exists
       ( select * 
         from login 
         where username = 'username' 
       ) userexists