将Zend模型定义为Singleton - Define a Zend Model as Singleton

Define a Zend Model as Singleton

本文关键字：Singleton 定义模型 Zend | 更新日期: 2023-09-27

我想把我的Zend模型作为Singleton，所以我这样做了:

class Social_Model_DbTable_Dossier extends Zend_Db_Table_Abstract {
private static $_instance;
public static function GetInstance() {
    if (!self::$_instance instanceof self) {
        self::$_instance = new self();
    }
    return self::$_instance;
}
private function __construct() {
    // put normal constructor code.
    // it will only ever be called once
}}

我像这样实例化我的模型:

        $dossiercasModel =  Social_Model_DbTable_Dossier::GetInstance();

但是这个错误发生了:

Fatal error: Access level to Social_Model_DbTable_Dossier::__construct() must be public (as in class Zend_Db_Table_Abstract)

当我把模型的构造函数作为公共时，它工作得很好，但这与单例的概念不一致!

过去，我通过创建一个表代理来提供缓存的表实例，从而绕过了必须这样做的问题。有点多。

一个简单的例子

class My_TableManager{
   protected static $_instance;
   protected $_tableCache = array();
   protected function __construct(){
   }
   public static function getInstance(){
       if (!isset(self::$_instance)) self::$_instance = new self();
   }
   public function getTable($tableName){
        if (!array_key_exists($tableName, $this->_tableCache)){
            // you can do fun stuff here like name inflection
            // Im assuming that tables will be suffixed with _Table
            $tableClass = "My_".$tableName."_Table";
            $this->_tableCache[$tableName] = new $tableClass();
        }
        return $this->_tableCache[$tableName];
   }
   public static function get($tableName){
        return self::getInstance()->getTable($tableName);
   }
}

要获取My_User_Table的实例，您可以:

$table = My_TableManager::get("My_User");

或

$table = My_TableManager::getInstnace()->getTable("My_Table");