ThinkPHP/Library/Think/Model/ViewModel.class.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think\Model;
use Think\Model;
/**
 * ThinkPHP视图模型扩展 
 */
class ViewModel extends Model {

    protected $viewFields = array();

    /**
     * 自动检测数据表信息
     * @access protected
     * @return void
     */
    protected function _checkTableInfo() {}

    /**
     * 得到完整的数据表名
     * @access public
     * @return string
     */
    public function getTableName() {
        if(empty($this->trueTableName)) {
            $tableName = '';
            foreach ($this->viewFields as $key=>$view){
                // 获取数据表名称
                if(isset($view['_table'])) { // 2011/10/17 添加实际表名定义支持 可以实现同一个表的视图
                    $tableName .=   $view['_table'];
                    $prefix     =   $this->tablePrefix;
                    $tableName  =   preg_replace_callback("/__([A-Z_-]+)__/sU", function($match) use($prefix){ return $prefix.strtolower($match[1]);}, $tableName);
                }else{
                    $class  =   $key.'Model';
                    $Model  =  class_exists($class)?new $class():M($key);
                    $tableName .= $Model->getTableName();
                }
                // 表别名定义
                $tableName .= !empty($view['_as'])?' '.$view['_as']:' '.$key;
                // 支持ON 条件定义
                $tableName .= !empty($view['_on'])?' ON '.$view['_on']:'';
                // 指定JOIN类型 例如 RIGHT INNER LEFT 下一个表有效
                $type = !empty($view['_type'])?$view['_type']:'';
                $tableName   .= ' '.strtoupper($type).' JOIN ';
                $len  =  strlen($type.'_JOIN ');
            }
            $tableName = substr($tableName,0,-$len);
            $this->trueTableName    =   $tableName;
        }
        return $this->trueTableName;
    }