Question

我使用Slim Framework在PHP中构建了一个简单的RESTful API。我还是OOP的新手。我有一个使用PDO查询数据库的路由。现在我想用更多路由扩展API，但我需要连接到不同的数据库。

示例路线：

$app->get('/usados/carrocarias', 'authenticate', function() {
        $response = array();
        $db = new DbHandler();

        // fetching all carrocarias
        $carrocarias = $db->getCarrocariasUsados();

        $response["error"] = false;
        $response["carrocarias"] = array();

        array_walk_recursive($carrocarias, function(&$val) {
            $val = utf8_encode((string)$val);
        });

        array_push($response["carrocarias"], $carrocarias);

        echoRespnse(200, $response, "carrocariasoutput");
    })->via('GET', 'POST');

我的DbHandler课程：

class DbHandler {

private $conn;

function __construct() {
    require_once dirname(__FILE__) . '/DbConnect.php';
    // opening db connection
    $db = new DbConnect();
    $this->conn = $db->connect();
}
...
}

我的DbConnect文件：

class DbConnect {

private $conn;

function __construct() {        
}

/**
 * Establishing database connection
 * @return database connection handler
 */
function connect() {
    include_once dirname(__FILE__) . '/Config.php';

    // Connecting to mysql database
    $this->conn = new PDO("dblib:host=".DB_HOST.";dbname=".DB_NAME.";charset=UTF-8", DB_USERNAME, DB_PASSWORD);
    $this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // returing connection resource
    return $this->conn;
}
}

DB_HOST，DB_NAME，DB_USERNAME和DB_PASSWORD在Config.php中定义。我知道我需要为其他数据库添加其他凭据到Config.php。

如何修改我的类和路由，以便我可以传递一个变量来决定连接哪个数据库？

编辑：我正在用我认为的解决方案来完成我的问题。至少对我来说，我希望它可以帮助我做其他新手。不知道这是不是最好的做法。

我的DBConnect.php

<?php

class DbConnect {

private $conn;
public $selDatabase;

function __construct($strServer) {
    $this->selDatabase = $strServer;
}

/**
 * Establishing database connection
 * @return database connection handler
 */
function connect() {
    include_once dirname(__FILE__) . '/Config.php';

    try {
        switch($this->selDatabase) {
            case 'mysql-localhost':
                $this->conn = new PDO('mysql:host=localhost;dbname=task_manager','root', 'mkecdapl');
                break;

            case 'sqlsrv-localhost':
                $this->conn = new PDO("sqlsrv:server=".DB_HOST.";Database=".DB_NAME_NOVOS.";charset=UTF-8", DB_USERNAME, DB_PASSWORD) or die("failed to connect");
                break;

            case 'dbusados-localhost':
                $this->conn = new PDO("sqlsrv:server=".DB_HOST.";Database=".DB_NAME_USADOS, DB_USERNAME, DB_PASSWORD) or die("failed to connect");
                break;
            case 'dbusados':
                $this->conn = new PDO("dblib:host=".DB_HOST.";dbname=".DB_NAME_USADOS, DB_USERNAME, DB_PASSWORD) or die('failed to connect');
                break;

            case 'dbnovos-localhost':
                $this->conn = new PDO("sqlsrv:server=".DB_HOST.";Database=".DB_NAME_NOVOS, DB_USERNAME, DB_PASSWORD) or die("failed to connect");
                break;
            case 'dbnovos':
                $this->conn = new PDO("dblib:host=".DB_HOST.";dbname=".DB_NAME_NOVOS, DB_USERNAME, DB_PASSWORD) or die('failed to connect');
                break;
            case 'dbnovas':
                $this->conn = new PDO("dblib:host=".DB_HOST.";dbname=".DB_NAME_NOVAS, DB_USERNAME, DB_PASSWORD) or die('failed to connect');
                break;
        }

        $this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        // returing connection resource
        return $this->conn;

    } catch (PDOException $e) {
        echo "DataBase Error: ".$e->getCode()." ".$e->getMessage();
    }
}

}

＆GT;

我的DBHandler是一样的。区别在于我的路线。而不是：

$db = new DbHandler();

我使用相应的数据库名称调用相同的方法：

$db = new DbHandler('dbusados');

Answer 1

将每个数据库连接添加为$ app对象的依赖项。

您可以设置不同的静态方法来返回正确的PDO对象。

$app->db1 = DbConnect::getDatabase1;

class DbHandler {

private $conn;

public static function  getDatabase1() {
    require_once dirname(__FILE__) . '/DbConnect_Database1.php';
    // opening db connection
    $db = new DbConnect();
    $db->conn = $db->connect();
    return $db;
}
...
}

如何使用SLIM管理PHP PDO中的多个数据库连接

1 个答案: