'Check if this credential has already been added to the database, if not add it in.'

def add_credential(self, url, username, password):

    cur = self.conn.cursor()
    cur.execute('SELECT    *    FROM    credentials    WHERE    LOWER(username)=LOWER(?)    AND    password=?', [url, username, password])
    results = cur.fetchall()
    if (not len(results)):
        cur.execute('INSERT    INTO    credentials    (username,    password)    VALUES    (?,?)', [username, password])
    cur.close()
