PDO连接类/代码和类设计

Question

我试图了解如何将PDO与"连接"类一起使用.

class db { 

    private static $dbh; 

    private function __construct(){}
    private function __clone(){} 

    public static function connect() { 
        if(!self::$dbh){ 
            self::$dbh = new PDO("mysql:host=localhost;dbname=database", "user", "password");
            self::$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
        } 
        return self::$dbh; 
    } 

    final public static function __callStatic( $chrMethod, $arrArguments ) {   
        $dbh = self::connect(); 
        return call_user_func_array(array($dbh, $chrMethod), $arrArguments);  
    }
} 

我从http://php.net/manual/en/book.pdo.php中取得了上述内容,稍微修改了变量,但我想知道如何连接到这个db类中的PDO连接对象？

$dbh = new db; //intiate connection???

$stmt = $dbh->prepare("SELECT * FROM questions WHERE id = :id"); // or should I do db::prepare.. ???
$stmt->bindParam(':id', $_GET['testid'], PDO::PARAM_INT);

if ($stmt->execute()) {
    while ($row = $stmt->fetch()){
        print_r($row);
    }
}

有什么想法吗？谢谢

Answer 1

这或多或少都是我这样做的.我不确定这是否是最佳方式,但它对我有用.

我的工厂类是我的代码的核心.从这里我生成我使用的所有课程.我的工厂类保存在单独的文件中factory.class.php.

通过拥有工厂类,我只需要包含一次类文件.如果我没有这个,我必须为每个必须使用它的文件包含我的类文件.如果我以后需要更新类文件名,我只需要在工厂类文件中进行更新.

创建工厂对象的另一个原因是减少数据库连接的数量.

我将每个类保存为单独的文件

工厂类

include_once('person.class.php');
include_once('tracking.class.php');
include_once('costAnalyzis.class.php');
include_once('activity.class.php');

class Factory {
  function new_person_obj($id = NULL) { return new Person(Conn::get_conn(), $id); }  
  function new_tracking_obj($id = NULL) { return new Tracking(Conn::get_conn(), $id); }
  function new_costAnalyzis_obj() { return new CostAnalyzis(Conn::get_conn()); }
  function new_activity_obj() { return new Activity(Conn::get_conn()); }
}    

连接类

// I have this class in the same file as Factory class
// This creates DB connection and returns any error messages
class Conn {
  private static $conn = NULL;

  private function __construct() {}

  private static function init() {
      $conf = self::config();
      try { 
        self::$conn = new PDO($conf['dsn'], $conf['user'], $conf['pass'], array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
      } 
      catch (PDOException $e) {
        // We remove the username if we get [1045] Access denied
        if (preg_match("/\b1045\b/i", $e->getMessage())) 
          echo "SQLSTATE[28000] [1045] Access denied for user 'name removed' @ 'localhost' (using password: YES)";
        else
          echo $e->getMessage();  
      }
  }

  public static function get_conn() {
    if (!self::$conn) { self::init(); }
    return self::$conn;
  }

  // I used to get login info from config file. Now I use Wordpress constants
  private static function config() {
    $conf = array();

    $conf['user']    = DB_USER; //$config['db_user'];
    $conf['pass']    = DB_PASSWORD; //$config['db_password'];
    $conf['dsn']     = 'mysql:dbname='.DB_NAME.';host='.DB_HOST;

    return $conf;
  }  
}

不同的类对象

这些是你的课程.这是您处理数据的地方在我自己的代码中,我使用的是三层体系结构,将表示分离,业务层和数据对象层.

class Person extends PersonDAO {

  function getPersonData($id) {
    $result = parent::getPersonData($id);

    // Here you can work with your data. If you do not need to handle data, just return result
    return $result;
  }
}


// I only have SQL queries in this class and I only return RAW results.
class PersonDAO {

  // This variable is also available from you mother class Person 
  private $db;

    // Constructor. It is automatically fired when calling the function.
    // It must have the same name as the class - unless you define 
    // the constructor in your mother class.
    // The &$db variable is the connection passed from the Factory class.
    function PersonDAO (&$db) {
      $this->db = &$db;
    }


  public function get_data($id) {
     $sql ="SELECT a, b, c
          FROM my_table
          WHERE id = :id";

     $stmt = $this->db->prepare($sql);
     $stmt->execute(array(':id'=> $id));
     $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

     return $result;
  }

  public function get_some_other_data() {
    $sql ="SELECT a, b, c
          FROM my_table_b";

    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);

    return $result;      
  }
}

为您的其他课程做同样的事情.

把它们放在一起

请注意,我们只包含一个文件,即工厂文件.所有其他类文件都包含在Factory类文件中.

// Include factory file
include_once('factory.class.php');

//Create your factory object
$person = Factory::new_person_obj();

//Get person data
$data = $person->getPersonData('12');

// output data
print_r($data);