$parent :
$results :
$primary_key :
__construct( $sql, $bind, $parent, $pk = Null)
rewind()
current()
next()
key()
valid()
count()
offsetSet( $offset, $value)
offsetUnset( $offset)
map( $valattr, $keyattr = Null)
offsetGet( $offset)
offsetExists( $offset)
__get( $name)
__isset( $name)
__set( $name, $value)
__unset( $name)