go beego orm 查询怎么只返回我想要的字段? 而不是全部返回?

//获取SKU列表
func (this *AdminRefundController) SKUList() {
    var msg = make(map[string]interface{})
    o := orm.NewOrm()
    var sku []models.TProduct
    _, err := o.QueryTable("TProduct").All(&sku)
    if err != nil {
        logs.Error(err)
        msg["code"] = 400
        msg["msg"] = "获取SKU失败"
        this.Data["json"] = msg
        this.ServeJSON()
        return
    }
    msg["code"] = 200
    msg["msg"] = "获取SKU成功"
    this.Data["json"] = &sku
    this.ServeJSON()
    return