?php
/***
 * @desc 工廠模式
 * ***/
interface DB{
  /*
   * @desc 接口類不體現(xiàn)具體實(shí)現(xiàn)，只是為了規(guī)范一套規(guī)則
   * **/
  public function conn();  
  public function add();
  public function delete();
  public function update();
  public function select();
  public function getLastSql();
}
/**
 * @desc 創(chuàng)建mysqlDb類
 * 接口是用來被實(shí)現(xiàn)的，并且每一個(gè)方法都必須要被實(shí)現(xiàn)
 * **/
class mysqlDb implements DB{
  public function conn(){
    echo "恭喜您，mysql數(shù)據(jù)庫連接成功";
  }
  public function add(){
  }
  public function delete(){
  }
  public function update(){
  }
  public function select(){
  }
  public function getLastSql(){
  }
}
/**
 * @desc 創(chuàng)建sqlServerDb 類
 * **/
class sqlServerDb implements DB{
  public function conn(){
    echo "恭喜您，sqlServer數(shù)據(jù)庫連接成功";
  }
  public function add(){
  }
  public function delete(){
  }
  public function update(){
  }
  public function select(){
  }
  public function getLastSql(){
  }
}
/**
 * @desc 創(chuàng)建一個(gè)數(shù)據(jù)庫工程類，用來生產(chǎn)對(duì)象
 * **/
class DbFactory{
  static $db = null;
  public static function getDb($type){
    switch($type){
      case 'mysql':
        self::$db = new mysqlDb();
        break;
      case 'sqlServer':
        self::$db = new sqlServerDb();
        break;  
    }
    return self::$db;
  }
}
//測(cè)試使用mysql來連接數(shù)據(jù)庫測(cè)試工程模式是否成功
$factory = new DbFactory();
$db = $factory->getDb('mysql');
$db->conn();