在 php 中使用 PDO 连接到数据库

Connecting to database with PDO in php

我为项目中的数据库连接编写了这个小 class:

 <?php
    class DatabaseUtility{

        private $dsn, $username, $password, $database, $pdo;

        public function __construct($host = 'localhost', $username = 'root', $password = '', $database){
            $this->dsn = "mysqli:dbname=$database;host:$host";
            $this->username = $username;
            $this->password = $password;
            $this->database = $database;
        }

        public function connect(){
            try{
                $this->pdo = new PDO($this->dsn,$this->username,$this->password,null);
                $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                $this->pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
            } catch(PDOException $err){
                die($err->getMessage());
            }
        }

        public function prepareStatment($query){
            $this->pdo->prepare($query);
        }

    }
?>

这就是我的使用方式:

<?php
    require 'DatabaseUtility.php';
    $db = new DatabaseUtility('localhost','root','','apex');
    $db->connect();
    $statment = $db->prepareStatment("Select offer_id from offer_images where img_id = :img_id");

?>

但我收到以下错误:

Could not find driver

我是 PDO 的新手所以请指导我我做错了什么?这种方法对于安全快速的数据库是否可行 activity?

更新: 我现在使用这些代码行来使用我的 DatabaseUtility class 但出现错误:

 <?php
        require 'DatabaseUtility.php';
        $id= 25;
        $db = new DatabaseUtility('localhost','root','','apex');
        $db->connect();
        $statment = $db->prepareStatment("Select offer_id from offer_images where img_id = :img_id");
       $statment->bindParam("img_id", $id ,PDO::PARAM_INT);
        $statment->execute();
        print_r($statment);
    ?>

错误是:

call to a member function bindParam() on a non-object in this line:
$statment->bindParam("img_id", $id ,PDO::PARAM_INT);

所以你似乎在混合 MYSQL as database with the MYSQL API's in PHP e.g. PDO, mysqli_*mysql_*

您使用 PDO 作为 API 连接到您的 MYSQL 数据库。但是你的 connection 字符串中有一些小错误:

                        //vvvvv < -- > vvvvvvvvv
$this->dsn = "mysqli:host=$host;dbname:$database";
                 //^ ^^^^ < - > ^^^^^^^ must be a equal sign
                 //| Your database is MYSQL so remove the i

您的 prepareStatment() 方法似乎没有返回任何内容。

public function prepareStatment($query){
    return $this->pdo->prepare($query);
}

这就是 $statment = $db->prepareStatment("Select offer_id from offer_images where img_id = :img_id"); 返回 false 的原因。