PHP - 使用命名空间创建 PDO 连接

Question

我有一个项目文件夹名称实用程序。 目录列表为：

- utilities
    - tli
        - database
            Connection.php
    index.php

Connection.php 是 PDOConnection。 代码是：

<?php

namespace app\tli\database;

use PDO;
use PDOException;

Class Connection
{
    private $server = "mysql:host=localhost;dbname=ytsurumaru_hanwa_coil_v.2";
    private $user = "root";
    private $pass = "";
    private $options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,);
    protected $con;

    public function openConnection()
    {
        try {
            $this->con = new PDO($this->server, $this->user, $this->pass, $this->options);
            return $this->con;
        } catch (PDOException $e) {
            return "There is some problem in connection: " . $e->getMessage();
        }
    }

    public function closeConnection()
    {
        $this->con = null;
    }
}

更新源

现在，我需要 index.php 中的这个 Connection 实例

<?php

namespace app;

use app\tli\database\Connection;
use PDOException as PDOEx;

require('tli/database/Connection.php');

try {
    $connection = new Connection(); // not found
    $connection->openConnection();
} catch (PDOEx $e) {
    echo $e->getMessage();
}

当我运行它时，

D:\wamp64\www\utilities\tli>php index.php

Warning: require(tli/database/Connection.php): failed to open stream: No such file or directory in D:\wamp64\www\utilities\tli\index.php on line 8

Fatal error: require(): Failed opening required 'tli/database/Connection.php' (include_path='.;C:\php\pear') in D:\wamp64\www\utilities\tli\index.php on line 8

如何解决，我的命名空间有问题吗？

Answer 1

这还不足以访问您的数据库连接吗？

require 'tli/database/Connection.php';

然后，由于您位于不同的名称空间并且没有别名，因此您应该在“try catch 块”中：

$connection = new Connection(); // not found

执行以下操作：

$connection = new \tli\database\Connection();

确保设置正确的路径。

或

您可以像这样使用不同的名称：

namespace app;
require 'tli/database/Connection.php';
use tli\database\Connection as MyConnection;
$connection = new MyConnection();

Answer 2

您需要使用其中的一个：

include('tli/database/Connection.php')
include_once('tli/database/Connection.php')
require('tli/database/Connection.php') 
require_once('tli/database/Connection.php')

或者，如果您想要更多自动化，请使用 autoloader。 你可能想看看this SO question 和所有相关的东西。