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<?php
namespace Wikimedia\Rdbms;
use stdClass;
class MssqlResultWrapper extends ResultWrapper {
/** @var int|null */
private $seekTo = null;
/**
* @return stdClass|bool
*/
public function fetchObject() {
$res = $this->result;
if ( $this->seekTo !== null ) {
$result = sqlsrv_fetch_object( $res, stdClass::class, [],
SQLSRV_SCROLL_ABSOLUTE, $this->seekTo );
$this->seekTo = null;
} else {
$result = sqlsrv_fetch_object( $res );
}
// Return boolean false when there are no more rows instead of null
if ( $result === null ) {
return false;
}
return $result;
}
/**
* @return array|bool
*/
public function fetchRow() {
$res = $this->result;
if ( $this->seekTo !== null ) {
$result = sqlsrv_fetch_array( $res, SQLSRV_FETCH_BOTH,
SQLSRV_SCROLL_ABSOLUTE, $this->seekTo );
$this->seekTo = null;
} else {
$result = sqlsrv_fetch_array( $res );
}
// Return boolean false when there are no more rows instead of null
if ( $result === null ) {
return false;
}
return $result;
}
/**
* @param int $row
* @return bool
*/
public function seek( $row ) {
$res = $this->result;
// check bounds
$numRows = $this->db->numRows( $res );
$row = intval( $row );
if ( $numRows === 0 ) {
return false;
} elseif ( $row < 0 || $row > $numRows - 1 ) {
return false;
}
// Unlike MySQL, the seek actually happens on the next access
$this->seekTo = $row;
return true;
}
}
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