php读取access数据库

<?php
//读取mdb数据库
$conn = new com("ADODB.Connection");
$connstr = "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=". realpath("../mydata.mdb");
$conn->Open($connstr);
$rs = new com("ADODB.RecordSet");
$rs->Open("select * from userinfo",$conn,1,1);
while(! $rs->eof) {
  $f = $rs->Fields(1);
  echo $f->value;
  echo " 　". $rs->Fields(2)->value;
  $rs->MoveNext();
}
?>