Collection
Collection
<?php
//1.创建PDO对象
$sql="SELECT * FROM `staff` WHERE `id`=:id ";//sql语句模板
// $sql = "SELECT * FROM `staff` WHERE `id`= :id ";
// $sql="select * from staff where id=:id";
$dsn='mysql:host=127.0.0.1;dbname=test';
$username='root';
$passod='root';
// $pdo=new PDO($dsn,$username,$passod);
try {
$pdo=new PDO('mysql:host=127.0.0.1;dbname=test','root','root');
} catch (PDOException $e) {
exit('PDO´´½¨²»³É¹¦'.$e->getMessage());
}
// $c=$pdo->query($sql);
// var_dump($c);
/* foreach ($c as $row) {
echo $row['name'].'=>'.$row['position'].'<br>';
}*/
//2.调用 prepare()创建预处理对象
$st=$pdo->prepare($sql);
$id=3;
$st->bindParam('id',$id,PDO::PARAM_INT);
//PDO::PARAM_INT,整数；定义PDO模板参数数据类型，默认为字符串。
//$st->bindValue('id',$id,PDO::PARAM_INT);//bindvalue不支持$id动态设置，bindParam支持$id动态设置
$st->execute();
$result=$st->fetch(PDO::FETCH_ASSOC);
print_r($result);
//查看预处理对象
//var_dump($st);
echo "<hr>";
$id=2;
$st->execute();
$result=$st->fetch(PDO::FETCH_ASSOC);
print_r($result);
//3.关闭PDO对象
$pdo=null;
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
</body>
</html>
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