php pdo 参数绑定

* 数据表

-- MySQL dump 10.16  Distrib 10.1.31-MariaDB, for osx10.6 (i386)
--
-- Host: localhost    Database: laravel
-- ------------------------------------------------------
-- Server version    10.1.31-MariaDB

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Table structure for table `users`
--

DROP TABLE IF EXISTS `users`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `users` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `password` varchar(60) NOT NULL,
  `remember_token` varchar(100) DEFAULT NULL,
  `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  PRIMARY KEY (`id`),
  UNIQUE KEY `users_email_unique` (`email`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `users`
--

LOCK TABLES `users` WRITE;
/*!40000 ALTER TABLE `users` DISABLE KEYS */;
INSERT INTO `users` VALUES (1,'mingzhanghui','xxx@qq.com','123456',NULL,'2018-06-30 16:00:00','2018-07-12 16:00:00'),(2,'username#0','0@qq.com','123456','ed3d2c21991e3bef5e069713af9fa6ca','2018-07-21 09:28:37','2018-07-21 09:29:37'),(3,'username#1','1@qq.com','123456','3416a75f4cea9109507cacd8e2f2aefc','2018-07-21 09:28:37','2018-07-21 09:29:37'),(4,'username#2','2@qq.com','123456','43ec517d68b6edd3015b3edc9a11367b','2018-07-21 09:28:37','2018-07-21 09:29:37'),(5,'username#3','3@qq.com','123456','182be0c5cdcd5072bb1864cdee4d3d6e','2018-07-21 09:28:37','2018-07-21 09:29:37'),(6,'username#4','4@qq.com','123456','2a38a4a9316c49e5a833517c45d31070','2018-07-21 09:28:37','2018-07-21 09:29:37'),(7,'username#5','5@qq.com','123456','ac627ab1ccbdb62ec96e702f07f6425b','2018-07-21 09:28:37','2018-07-21 09:29:37'),(8,'username#6','6@qq.com','123456','2a38a4a9316c49e5a833517c45d31070','2018-07-21 09:28:37','2018-07-21 09:29:37'),(9,'username#7','7@qq.com','123456','f033ab37c30201f73f142449d037028d','2018-07-21 09:28:37','2018-07-21 09:29:37'),(10,'username#8','8@qq.com','123456','03afdbd66e7929b125f8597834fa83a4','2018-07-21 09:28:37','2018-07-21 09:29:37'),(11,'username#9','9@qq.com','123456','33e75ff09dd601bbe69f351039152189','2018-07-21 09:28:37','2018-07-21 09:29:37');
/*!40000 ALTER TABLE `users` ENABLE KEYS */;
UNLOCK TABLES;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2018-07-22 12:07:18

* php 代码片段

<?php

$settings = [
    'host' => '127.0.0.1',
    'port'=> 3306,
    'name' => 'laravel',
    'username' => 'root',
    'password' => '',
    'charset' => 'utf8'
];
try {
    $pdo = new PDO(
        sprintf(
            'mysql:host=%s;dbname=%s;port=%d;charset=%s',
            $settings['host'],
            $settings['name'],
            $settings['port'],
            $settings['charset']
        ),
        $settings['username'],
        $settings['password']
    );
} catch (PDOException $e) {
    echo "Database connection failed: ".$e->getMessage();
    exit;
}

// $sql = 'SELECT * from users where email=:email';
$sql = 'SELECT * from users where id < :id';
$statement = $pdo->prepare($sql);

// $email = filter_input(INPUT_GET, 'email');
// $statement->bindValue(':email', '8@qq.com', PDO::PARAM_STR);
$statement->bindValue(':id', 8, PDO::PARAM_INT);
$statement->execute();

// while (($result = $statement->fetch(PDO::FETCH_ASSOC)) !== false) {
//     echo $result['email'].PHP_EOL;
// }
while (($o = $statement->fetchObject()) !== false) {
    echo $o->email.PHP_EOL;
}

// transanction
// $pdo->beginTransaction();
// ...
// $pdo->commit();

　　

* output

chenhuimingdeMacBook-Pro:database Mch$ php pdo.php

xxx@qq.com
0@qq.com
1@qq.com
2@qq.com
3@qq.com
4@qq.com
5@qq.com