php连接access数据库为什么老是出错？

程序如下，运行的时候老是提示错误(数据库没有密码和用户名设置):
Fatal error: Uncaught exception 'com_exception' with message 'Source: Microsoft OLE DB Provider for ODBC Drivers
Description: Operation was canceled.' in C:\Documents and Settings\han0000t\workspace\hantao\access.php:19
Stack trace:
#0 C:\Documents and Settings\han0000t\workspace\hantao\access.php(19): com->open('driver=microsof...')
#1 {main}
  thrown in C:\Documents and Settings\han0000t\workspace\hantao\access.php on line 19
有谁知道错在哪里，以及如何修改么？
先谢谢啦，
<?php

    $conn = new com("ADODB.Connection");
    $connstr = "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=".realpath("db/hallo.mdb");
    $conn->Open($connstr);
    $rs=new com("ADODB.RecordSet");
    $rs->Open("select * from news",$conn,1,1);
    while(!$rs->eof)
    {
    $f=$rs->Fields("title");
    echo $f->value ."<br>";
    $rs->MoveNext();
    }
    $rs->close();
   
    ?>
<?php  
$dbc=new com("adodb.connection");
$dbc->open("driver=microsoft access driver (*.mdb);dbq=".realpath("db/hallo.mdb"));
//$rs=$dbc->Execute("select * from news");
$i=0;
while(!  $rs->eof)  {  
echo  $rs->Fields("title")->value."<br/>";  
$rs->MoveNext();  
}

?><br>
<br>

<?php
$conn = new com("ADODB.Connection");  
$connstr = "DRIVER={Microsoft Access Driver (*.mdb)};DBQ=".realpath("db/hallo.mdb");  
$conn->Open($connstr);  
$rs  =  new  com("ADODB.RecordSet");  
$rs->Open("select  *  from  news",$conn,1,1);
while(!  $rs->eof)  {  
echo  $rs->Fields["title"]->value."<br/>";  
$rs->MoveNext();  
}
?>

[ 本帖最后由 天各一方2010 于 2011-3-25 17:55 编辑 ]