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HomeBackend DevelopmentPHP TutorialPHP实现链式操作的核心思想_PHP

PHP 链式操作的实现

 

代码如下:


 $db->where()->limit()->order();
 

在 Common 下创建 Database.php。

链式操作最核心的地方在于:在方法的最后 return $this;

Database.php:

<&#63;php
namespace Common;

class Database{
  function where($where){
    return $this;  //链式方法最核心的地方在于:在每一个方法之后 return $this
  }
  function order($order){
    return $this;
  }
  function limit($limit){
    return $this;
  }
}

index.php:

<&#63;php
define('BASEDIR',__DIR__); //定义根目录常量
include BASEDIR.'/Common/Loader.php';
spl_autoload_register('\\Common\\Loader::autoload');

$db = new \Common\Database(); 

//传统的操作需要多行代码实现
//$db->where('id = 1');
//$db->where('name = 2');
//$db->order('id desc');
//$db->limit(10);

//使用链式操作,一行代码解决问题
$db->where('id = 1')->where('name = 2')->order('id desc')->limit(10);

在使用链式操作时,ide(netbeans 会给出自动提示):

 

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