Source
100     * this should include quotes.
101     *
102     * @param $value mixed The value to check
103     * @return string The encoded value
104     */
105    function prepValueForDB($value) {
106       if($value === null || $value === "" || $value === false) {
107          return "null";
108       } else {
109          return "'" . addslashes($value) . "'";
110       }
111    }   
112    
113    /**
114     * Prepare the current field for usage in a
115     * database-manipulation (works on a manipulation reference).