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     ->join('B b','a.status=b.status')
     ->field('a.name,b.status')
     ->select();

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class UserModel extends Model
{
    //hasOne¹ØÁªÅÌÎÊ
    public function order()
    {
        return $this->hasOne('OrderModel','user_id','id');
    }
}

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class UserModel extends Model
{
    //hasMany¹ØÁªÅÌÎÊ
    public function order()
    {
        return $this->hasMany('OrderModel','user_id','id');
    }
}

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class UserModel extends Model
{
    //belongsToMany¹ØÁªÅÌÎÊ
    public function goods()
    {
        return $this->belongsToMany('GoodsModel','user_goods','goods_id','user_id');
    }
}

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