PDO链接方法

<?php

//定义数据源
$dsn = "mysql:dbname=mydb;host=localhost";
//$dsn = "sqlsrv:dbname=mydb;host=localhost";

//造pdo对象
$pdo = new PDO($dsn,"root","123");

//写SQL语句
$sql = "select * from Info";

//准备执行SQL语句
$st = $pdo->prepare($sql);

//执行预处理语句
if($st->execute())
{
    /*while($attr = $st->fetch())
    {
        print_r($attr);
        echo "<br>";
    }*/

    //从结果集中取所有数据，返回二维数组
    //print_r($st->fetchAll(PDO::FETCH_NUM));

    //从结果集中取一条数据中的某一列，返回字符串
    //var_dump($st->fetchColumn(1));

    //从结果集中取一条数据，返回一个实体类的对象
    //var_dump($st->fetchObject());

}
else
{
    echo "执行失败！";
}

?>