SQL SERVER - How add new user to DB and how add him admin rights

This code:

1. Create new login.
2. Add new user for this login to DB.
3. Set full admin rights for this user.

/* -- new admin user login - creation */

if not exists 
  ( select 'x'  
    from master.sys.server_principals
    where
    lower( name ) = 'framework_admin' 
  )
begin
  create login framework_admin with password = 's5gh7f5s3', default_database = [master];
end;

/* -- add user for created login to DB */

if not exists
  ( select 'x' 
    from sys.database_principals
    where
    lower( name ) = 'framework_admin'
  )
begin
  use framework;
  create user framework_admin for login framework_admin;
end;

/* -- add all rights */

use framework;
exec sp_addrolemember N'db_owner', N'framework_admin';