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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
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<body>
<?php
//造DSN：驱动名：dbname=数据库名；host=服务器地址
$dsn="mysql:dbname=mydb;host=localhost";
$pdo=new PDO($dsn,"root","");
//写sql语句v
$sql="select * from Info";
//$v=$pdo->query();
//var_dump($v);
//foreach($v as $a)
//{
// echo $a[0];
//}
//预处理sql语句，先把sql语句放到服务器上等待我们给他指令去执行
$r=$pdo->query();
var_dump($r);
$stm=$pdo->prepare($sql);//准备一条sql语句
//执行SQL语句,执行成功返回true，失败返回false
if($stm->execute())
{
var_dump($stm->fetch());//1.逐行取数据
//var_dump($stm->fetchAll());//2.取所有的
//$stm->fetchColumn(1);//3.取某一列
//var_dump($stm->fetchObject());//4.返回对象
}
else
{echo "执行失败!";}
?>
</body>
</html>
时间： 2024-10-20 14:37:45