预处理语句

预处理语句

优点：效率高 （用于执行多个相同的 SQL 语句，并且执行效率更高）、 安全（防止 MySQL 注入）

<?php

$dsn = 'mysql:host = localhost;dbname=user;charset=utf8';
try{
    $pdo = new PDO($dsn,'root','123456');
    $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e)
{
    die('数据库连接失败'.$e->getMessage());
}

try{
    /*
     $sql ='insert into user(name, password, money) value(?,?,?)';
    $stmt = $pdo->prepare($sql);
    $stmt->bindparam(1,$name);
    $stmt->bindparam(2,$pwd);
    $stmt->bindparam(3,$money); */

    /*$sql ='insert into user(name, password, money) value(:name, :password, :money)';
    $stmt = $pdo->prepare($sql);*/
    /*$stmt->bindparam(':name',$name);
    $stmt->bindparam(':password',$pwd);
    $stmt->bindparam(':money',$money);

    $name= '赵本山';
    $pwd = '12345';
    $money = 1500;

    $stmt->execute();

    $name = '小沈阳';
    $pwd = 'abcde';
    $money = 2000;

    $stmt->execute();

    $stmt->execute([':name' => '刘备',':password'=>'123456',':money'=>'2000']);

    $stmt->execute(['张飞','abc456','2000']);

    $stmt = $pdo->prepare('delete from user where id = ?');
    $stmt ->execute([1]);*/

    $stmt = $pdo->prepare('update user set name= :name where id= :id');
    $stmt->execute([':name'=>'关羽',':id'=>'4']);
}catch(PDOException $e){
    echo $e->getMessage();
}