thinkphp 多对多关联模型(转)

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<?php

 class UserModel extends RelationModel{

     protected $_link=array(

       "group"=>array(

           "mapping_type"=>MANY_TO_MANY,

           "foreign_key"=>"uid",//中间表的字段

           "relation_foreign_key"=>"gid",//中间表的字段

           "relation_table"=>"think_user_group"

     )

     );

 }

?>

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<?php

// 本类由系统自动生成，仅供测试用途

class IndexAction extends Action {

    public function index(){

        $db=D("user");

        $list=$db->relation(true)->select();

        echo "<pre>";

        print_r($list);

    }

}