《PHP學習：如何讓CI框架支持service層》要點：
本文介紹了PHP學習：如何讓CI框架支持service層，希望對您有用。如果有疑問，可以聯系我們。
大家知道CodeIgniter框架式MVC分層的,通常大家把業務邏輯寫到Controller中,而Model只負責和數據庫打交道.PHP實戰
但是隨著業務越來越復雜,controller越來越臃腫,舉一個簡單的例子,比如說用戶下訂單,這必然會有一系列的操作：更新購物車、添加訂單記錄、會員添加積分等等,且下訂單的過程可能在多種場景出現,如果這樣的代碼放controller中則很臃腫難以復用,如果放model會讓持久層和業務層耦合.現在公司的項目就是,很多人將一些業務邏輯寫到model中去了,model中又調其它model,也就是業務層和持久層相互耦合.這是極其不合理的,會讓model難以維護,且辦法難以復用.PHP實戰
是不是可以考慮在controller和model中加一個業務層service,由它來負責業務邏輯,封裝好的調用接口可以被controller復用.PHP實戰
這樣各層的任務就明確了：
Model(DAO):數據持久層的工作,對數據庫的操作都封裝在這.
Service ： 業務邏輯層,負責業務模塊的邏輯應用設計,controller中就可以調用service的接口實現業務邏輯處理,提高了通用的業務邏輯的復用性,設計到具體業務實現會調用Model的接口.
Controller ：控制層,負責具體業務流程控制,這里調用service層,將數據返回到視圖
View ： 負責前端頁面展示,與Controller緊密聯系.PHP實戰
基于上面描述,實現過程：
(1)讓CI能夠加載service,service目錄放在application下,因為CI系統沒有service,則在application/core下新建擴展MY_Service.phpPHP實戰
代碼如下:
<?php
class MY_Service
{
??? public function __construct()
??? {
??????? log_message('debug', "Service Class Initialized");
??? }
??? function __get($key)
??? {
??????? $CI = & get_instance();
??????? return $CI->$key;
??? }
}
(2)擴展CI_Loader實現,加載service,在application/core下新建MY_Loader.php文件：PHP實戰
代碼如下:
<?php
class MY_Loader extends CI_Loader
{
??? /**
? * List of loaded sercices
? *
? * @var array
? * @access protected
? */
?protected $_ci_services = array();
?/**
? * List of paths to load sercices from
? *
? * @var array
? * @access protected
? */
?protected $_ci_service_paths??= array();
??? /**
???? * Constructor
???? *
???? * Set the path to the Service files
???? */
??? public function __construct()
??? {
??????? parent::__construct();
??????? $this->_ci_service_paths = array(APPPATH);
??? }
??? /**
???? * Service Loader
???? *
???? * This function lets users load and instantiate classes.
? * It is designed to be called from a user's app controllers.
? *
? * @param?string?the name of the class
? * @param?mixed?the optional parameters
? * @param?string?an optional object name
? * @return?void
???? */
??? public function service($service = '', $params = NULL, $object_name = NULL)
??? {
??????? if(is_array($service))
??????? {
??????????? foreach($service as $class)
??????????? {
??????????????? $this->service($class, $params);
??????????? }
??????????? return;
??????? }
??????? if($service == '' or isset($this->_ci_services[$service])) {
??????????? return FALSE;
??????? }
??????? if(! is_null($params) && ! is_array($params)) {
??????????? $params = NULL;
??????? }
??????? $subdir = '';
??????? // Is the service in a sub-folder? If so, parse out the filename and path.
??????? if (($last_slash = strrpos($service, '/')) !== FALSE)
??????? {
??????????????? // The path is in front of the last slash
??????????????? $subdir = substr($service, 0, $last_slash + 1);
??????????????? // And the service name behind it
??????????????? $service = substr($service, $last_slash + 1);
??????? }
??????? foreach($this->_ci_service_paths as $path)
??????? {
??????????? $filepath = $path .'service/'.$subdir.$service.'.php';
??????????? if ( ! file_exists($filepath))
??????????? {
??????????????? continue;
??????????? }
??????????? include_once($filepath);
??????????? $service = strtolower($service);
??????????? if (empty($object_name))
??????????? {
??????????????? $object_name = $service;
??????????? }
??????????? $service = ucfirst($service);
??????????? $CI = &get_instance();
??????????? if($params !== NULL)
??????????? {
??????????????? $CI->$object_name = new $service($params);
??????????? }
??????????? else
??????????? {
??????????????? $CI->$object_name = new $service();
??????????? }
??????????? $this->_ci_services[] = $object_name;
??????????? return;
??????? }
??? }
}
(3)簡單例子實現：
控制器中調用service ：PHP實戰
代碼如下:
<?php
class User extends CI_Controller
{
??? public function __construct()
??? {
??
??????? parent::__construct();
??????? $this->load->service('user_service');
??? }
??? public function login()
??? {
??????? $name = 'phpddt.com';
??????? $psw = 'password';
??????? print_r($this->user_service->login($name, $psw));
??? }
}
service中調用model ：PHP實戰
代碼如下:
<?php
class User_service extends MY_Service
{
??? public function __construct()
??? {
??????? parent::__construct();
??????? $this->load->model('user_model');
??? }
??? public function login($name, $password)
??? {
??????? $user = $this->user_model->get_user_by_where($name, $password);
??????? //.....
??????? //.....
??????? //.....
??????? return $user;
??? }
}
model中你只跟db打交道：PHP實戰
代碼如下:
<?php
class User_model extends CI_Model
{
??? public function __construct()
??? {
??????? parent::__construct();
??? }
??? public function get_user_by_where($name, $password)
??? {
??????? //$this->db
??????? //......
??????? //......
??????? return array('id' => 1, 'name' => 'mckee');
??? }
}
基本實現思路便是這樣的.PHP實戰
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