odbc errors

[eight02645999 at yahoo.com]

hi

i have a piece of code:
...

def connectdb(sql):
    import dbi
    import odbc
    import sys
    try:
        s = odbc.odbc('DSN=CONN;UID=user;PWD=pass')
        cur = s.cursor()
       # cur.execute("set nocount on")
        cur.execute(sql)
        while 1:
            rec = cur.fetchone()
            if not rec: break
    return rec
    except:
        print 'error while processing ', sys.exc_type,sys.exc_value
    s.close()
    cur.close()
    s = None
    cur = None

...
sql = r'update table set col = 'A' where user = "user1"'
connectdb(sql)


when i execute it from CGI, i encounter the following :
error while processing dbi.internal-error [MERANT][ODBC Sybase ASE
driver]Invalid cursor state. in FETCH None

but when i did check the table, the value of col is updated to 'A',
how can i suppress the above error message? or is there some other
things
that are wrong with the code.
thanks