PHP使用pdo连接access数据库并循环显示数据操作示

try {
$conn = new PDO("odbc:driver={microsoft aess driver (.mdb)};
       dbq=".realpath("MyDatabase.mdb"))
       or die("链接错误！");
//echo "链接成功！";
}
catch(PDOException $e){
  echo $e->getMessage();
}
$sql = "select  from users";

foreach ($conn->query($sql) as $row) {
$row["UserID"];
$row["UserName"];
$row["UserPassword"];
}

$rs = $conn->query($sql);
$rs->setFetchMode(PDO::FETCH_NUM);
while($row=$rs->fetch()){
$row[0];
$row[1];
$row[2];
}

<?php
//PDO::query()查询
$res = $db->query('select  from user');
$res->setFetchMode(PDO::FETCH_NUM); //数字索引方式
while ($row = $res->fetch()){
print_r($row);
}
?>

<?php
//PDO->exec()处理sql
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$res = $db->exec("insert into user(id,name) values('','php点点通')");
echo $res;
?>

<?php
//PDO::prepare()预处理执行查询
$res = $db->prepare("select  from user");
$res->execute();
while ($row = $res->fetchAll()) {
print_r($row);
}
?>

<?php
$res = $db->query('select  from user');
//获取指定记录里第二个字段结果
$col = $res->fetchColumn(1);
echo $col;
?>

<?php
$res = $db->query('select  from user');
$res_arr =$res->fetchAll();
print_r($res_arr);
?>