Question

我有connection.php文件：

<?php

       $dsn='mysql:host=localhost;dbname=sakila';
   $hostname='localhost';
   $username='root';
   $password='';
    $PDO_ob = new PDO($dsn, $username, $password);
   try {
        $PDO_ob = new PDO($dsn, $username, $password);
        $PDO_ob->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
          echo " connection success";
    } catch (PDOException $ex) {
        echo 'Connection failed: ' . $ex->getMessage();
    }
   ?>  
And functions.php  as :

    <?php 
    include "../category_prodct_pdo/connection.php";

    function get_products(){
        global $PDO_ob;


        $sql="SELECT * FROM products";
        $products=$PDO_ob->query($sql); 
        return $products;
    }
    ?>

当我删除行glopal $ PDO_op;我收到n错误消息＆＃34;未定义的变量：PDO_ob＆＃34; 我知道在函数中使用全局变量并不是最好的工具那么如何在不使用函数内部全局的情况下完成这项工作提前谢谢你

Answer 1

除了评论建议之外，我建议使用Class作为数据库连接并使用get实例函数。

final class DatabaseFactory
{
    public $pdo;
    public static function Instance()
    {
        static $inst = null;
        if ($inst === null) {
            $inst = new DatabaseFactory();
        }
        return $inst;
    }

    /**
     * Private ctor so nobody else can instantiate it
     *
     */
    private function __construct()
    {
         $dsn='mysql:host=localhost;dbname=sakila';
       $hostname='localhost';
       $username='root'; // avoid connecting with root user 
       $password='{put password for db connection, it is more secure}';
       try {
            $this->pdo = new PDO($dsn, $username, $password);
            $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
              echo " connection success";
        } catch (PDOException $ex) {
            echo 'Connection failed: ' . $ex->getMessage();
        }
    }
}

替换全局$ PDO对象以维护安全性

1 个答案: