<?php

/**
 * 教师班级关系管理模型类
 * @author jiangfei
 * @date 2015-08-19 10:30:00
 * @company 上海风车教育有限公司.
 */

class TeacherToClass extends MyActiveRecord{
	
	public $class_name;
	
	public static function model($className = __CLASS__){
		return parent::model($className);
	}

	public function tableName(){
		return 'teacher_class_relation';
	}
	
	// 通过教师id获取当前学期执教的班级
	public function getClassByTeacher($sid,$tid){
		$sql 	= 	'SELECT c.class_name FROM '.$this->tableName().' as tcr left join class as c on c.class_id = tcr.class_id where tcr.semester_id="'.$sid.'" and tcr.teacher_id  = "'.$tid.'"';
		$list 	= 	$this->findAllBySql($sql);
		$str	=	'';
		if (empty($list)) {
			$str	=	'暂无';
		} else {
			foreach ($list as $vv) {
				$str.=$vv->class_name.',';
			}
			$str	=	rtrim($str,',');
		}
		return $str;
	}

	public function getTeacher($sql){
		$info = $this->getDbConnection()->createCommand($sql)->queryRow();
		return $info;
	}
}