Question

我已在我的项目中为我的数据库连接编写了这个小类：

 <?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);
        }

    }
?>

这就是我使用它的方式：

<?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，所以请指导我做错了什么？这种方法对于安全快速的数据库活动是否合适？

更新我现在使用这些代码行来使用我的DatabaseUtility类，但是出现了错误：

 <?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);

Answer 1

您似乎没有在prepareStatment()方法中返回任何内容。

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

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

用php中的PDO连接到数据库

1 个答案: