PHPCMS V9代码解析： $this->cdb = pc_base::load_model('admin_model');

PHPCMS V9代码解析：
$this->cdb = pc_base::load_model('admin_model');

调用：

/**

* 加载数据模型

* @param string $classname 类名

*/

public static function load_model($classname) {

return self::_load_class($classname,'model');

}


这个时候传输参数‘model’，继续调用_load_class：


/**

* 加载类文件函数

* @param string $classname 类名

* @param string $path 扩展地址

* @param intger $initialize 是否初始化

*/

private static function _load_class($classname, $path = '', $initialize = 1) {

static $classes = array();

if (empty($path)) $path = 'libs'.DIRECTORY_SEPARATOR.'classes';



$key = md5($path.$classname);

if (isset($classes[$key])) {

if (!empty($classes[$key])) {

return $classes[$key];

} else {

return true;

}

}

if (file_exists(PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php')) {

include PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php';

$name = $classname;

if ($my_path = self::my_path(PC_PATH.$path.DIRECTORY_SEPARATOR.$classname.'.class.php')) {

include $my_path;

$name = 'MY_'.$classname;

}

if ($initialize) {

$classes[$key] = new $name;

} else {

$classes[$key] = true;

}

return $classes[$key];

} else {

return false;

}

}

通过include 引入model文件夹下的源代码类admin_model.

具体源代码如下：

<?php

defined('IN_PHPCMS') or exit('No permission resources.');

pc_base::load_sys_class('model', '', 0);

class admin_model extends model {

public function __construct() {

$this->db_config = pc_base::load_config('database');

$this->db_setting = 'default';

$this->table_name = 'admin';

parent::__construct();

}

}

?>

父类 mode的关键源代码为：

<?php
/**
 *  model.class.php 数据模型基类
 *
 * @copyright (C) 2005-2010 PHPCMS
 * @license http://www.phpcms.cn/license/
 * @lastmodify 2010-6-7
 */
pc_base::load_sys_class('db_factory', '', 0);
class model {
//数据库配置
protected $db_config = '';
//数据库连接
protected $db = '';
//调用数据库的配置项
protected $db_setting = 'default';
//数据表名
protected $table_name = '';
//表前缀
public  $db_tablepre = '';
public function __construct() {
if (!isset($this->db_config[$this->db_setting])) {
$this->db_setting = 'default';
}
$this->table_name = $this->db_config[$this->db_setting]['tablepre'].$this->table_name；

$this->db_tablepre = $this->db_config[$this->db_setting]['tablepre'];
$this->db = db_factory::get_instance($this->db_config)->get_database($this->db_setting);

}

在类db_factory 中使用静态方法获取数据库连接实例，

final class db_factory {
/**
* 当前数据库工厂类静态实例
*/
private static $db_factory;
/** * 数据库配置列表 */
 protected $db_config = array();
 /** * 数据库操作实例化列表 */
 protected $db_list = array();
 /** * 构造函数 */
 public function __construct()
 { }