pdo的基本使用
查询数据用query
$dsn = "mysql:host=127.0.0.1;dbname=php7";
$pdo = new PDO($dsn, 'root', 'root');
$pdo->query('set names utf8');
$result = $pdo->query('select * from day1');
$result->setFetchMode(PDO::FETCH_ASSOC);//为语句设置默认的获取模式。
$result_arr=$result->fetchAll();
print_r($result_arr);
//建立一个表单页面
<html>
<table>
<form action="form.php" method='post'>
<input type='text' name='name'/>
<input type='password' name='pwd'/>
<input type='submit' value='登陆'>
</form>
</table>
</html>
//跳转到另外一个表单（form.php）页面，进行pdo各项的使用，并且用pdo进行各种处理
<?php
$dsn = "mysql:host=127.0.0.1;dbname=php7";//连接数据库
$db = new PDO($dsn,'root','root');//数据库账号密码
$name=$_POST['name'];//接值
//$name="zhangsan' or 'a' ='a";
$pwd=$_POST['pwd'];
$sql="select * from pdo1 where name='$name' and pwd ='$pwd'";
$sql="select * from pdo1 where name =? and pwd =?";
$stmt = $db->prepare($sql);
$exeres = $stmt->execute(array($name, $pwd));
if ($exeres) {
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
print_r($row);
}
}
//引入sql
$dsn = "mysql:host=127.0.0.1;dbname=php7"; $db = new PDO($dsn,'root','root'); $name="zhangsan' or 'a' ='a"; $pwd=$_POST['pwd']; $sql="select * from pdo1 where name='$name' and pwd ='$pwd'";