Dbi.Mysql using parameters error - beginner simple problem

Dear Friends,
First Thanks for taking your valuable time.
quick look  so you don't have to read the whole email if it is an 
obvious error-
The error message is as follows: Error: Illegal keyword given: Mark. 
[condition type: program error]

  this function gives the previous error.  

 (defun get-user (db first second)
    (sql " format nil select UserName, Pwd from Login where UserName = 
'~a' and Pwd = '~a'"
              first second
             :db db)
     (mysql-insert-id db))

I call the function this way: (get-user db 'Mark 'Peg)

The error message is as follows: Error: Illegal keyword given: Mark. 
[condition type: program error]
Any resources for code examples or documentation on using dbi.mysql??


 I have Allegro CL installed in my Linux Machine and have tried to use 
Allegro Serve with MySQL to create a web application. All is going ok so 
far but... (ha ha) Here is my problem, I have two functions one for 
inserting and one for looking up a login user through MySQL. The insert 
works but the lookup won't accept my parameters for the select statement.
   Here are the two functions with the function calls i make to lisp in 
emacs. Can you see where the problem is?? i use dbi.mysql and put in 
this function call (setq db (connect :user "markandeya" :password 
"service" :database "CallMaint")).
 this connects me to my Mysql database and is working.

this function works
(defun add-user (db first second)
     (sql (format nil "insert into Login (UserName, Pwd) values('~a','~a')"
            first  second
             :db db))
     (mysql-insert-id db))

i call the function this way: (add-user db 'Mark 'Peg)
 

  this function gives errors  
 (defun get-user (db first second)
    (sql " format nil select UserName, Pwd from Login where UserName = 
'~a' and Pwd = '~a'"
              first second
             :db db)
     (mysql-insert-id db))

I call the function this way: (get-user db 'Mark 'Peg)

The error message is as follows: Error: Illegal keyword given: Mark. 
[condition type: program error]

Thank you for any help or suggestions on database programming through Mysql.
Markandeya