使用beego开发时候需要注意的地方

一、多表查询的时候建议使用原生sql查询，若使用beego提供的orm表定义的方法查询，返回字段形式固定，对于有代码强迫症的小伙伴来说很别扭，请看下图：

func GetGoodsList(form *GoodsListForm) (err *utils.ControllerError, list *[]orm.Params) {
    var maps []orm.Params
    var returnp *utils.ControllerError
    o := orm.NewOrm()
    qs := o.QueryTable(new(Goods)).RelatedSel()
    var limit, offset int
    var errd error
    if form.Limit < 1 {
        limit = 20
    }
    if form.Offset < 1 {
        offset = 0
    }
    if len(form.GoodTypId) == 0 {
        _, errd = qs.Limit(limit, offset).OrderBy("Look").Values(&maps, "name", "GoodType__TypeId", "GoodType__TypeName", "Look", "GoodsId", "Price", "Discount", "ImageUrl", "StoreInfo__Amount", "StoreInfo__Left")
    } else {
        _, errd = qs.Filter("GoodType__TypeId", form.GoodTypId).Limit(limit, offset).OrderBy("Look").Values(&maps, "name", "GoodType__TypeId", "GoodType__TypeName", "Look", "GoodsId", "Price", "Discount", "ImageUrl", "StoreInfo__Amount", "StoreInfo__Left")
    }
    if errd != nil {
        returnp = utils.ErrDatabase
    } else {
        returnp = utils.Actionsuccess
    }
    return returnp, &maps
}

传入参数返回

{
    "code": 9000,
    "data": [
        {
            "Discount": 7,
            "GoodType__TypeId": "2018020209225223",
            "GoodType__TypeName": "保险推销",
            "GoodsId": "2018020209252238",
            "ImageUrl": "",
            "Look": 9,
            "Name": "成人意外险",
            "Price": 90,
            "StoreInfo__Amount": 350,
            "StoreInfo__Left": 350
        }
    ],
    "message": "获取信息成功"
}

返回字段都是大写，且关联表字段含有双_，对于这样的格式我只能呵呵了

如果采用原生SQL查询，请看一下代码

func GetGoodsList1(form *GoodsListForm) (err *utils.ControllerError, list *[]orm.Params) {
    var maps []orm.Params
    var returnp *utils.ControllerError
    var errd error
    limit, offset := form.Limit, form.Offset
    if limit < 1 {
        limit = 20
    }
    if offset < 1 {
        offset = 0
    }
    o := orm.NewOrm()
    if len(form.GoodTypId) > 0 {
        _, errd = o.Raw("SELECT T0.`name` `name`, T1.`type_id` `typeid`, T1.`type_name` `typename`, T0.`look` `look`, T0.`goods_id` `goodsid`, T0.`price` `price`, T0.`discount` `discount`, T0.`image_url` `imageurl`, T2.`amount` `amount`, T2.`left` `left` FROM `goods` T0 INNER JOIN `good_type` T1 ON T1.`id` = T0.`good_type_id` INNER JOIN `good_store` T2 ON T2.`id` = T0.`store_info_id` WHERE T1.`type_id` = ? ORDER BY T0.`look` ASC LIMIT ? OFFSET ?", form.GoodTypId, limit, offset).Values(&maps)
    } else {
        _, errd = o.Raw("SELECT T0.`name` `name`, T1.`type_id` `typeid`, T1.`type_name` `typeName`, T0.`look` `look`, T0.`goods_id` `goodsid`, T0.`price` `price`, T0.`discount` `discount`, T0.`image_url` `imageurl`, T2.`amount` `amount`, T2.`left` `left` FROM `goods` T0 INNER JOIN `good_type` T1 ON T1.`id` = T0.`good_type_id` INNER JOIN `good_store` T2 ON T2.`id` = T0.`store_info_id` ORDER BY T0.`look` ASC LIMIT ? OFFSET ?", limit, offset).Values(&maps)
    }
    if errd != nil {
        returnp = utils.ErrDatabase
    } else {
        returnp = utils.Actionsuccess
    }
    return returnp, &maps
}

传入参数返回

{
    "code": 9000,
    "data": [
        {
            "amount": "350",
            "discount": "7",
            "goodsid": "2018020209252238",
            "imageurl": "",
            "left": "350",
            "look": "9",
            "name": "成人意外险",
            "price": "90",
            "typeid": "2018020209225223",
            "typename": "保险推销"
        }
    ],
    "message": "获取信息成功"
}

采用原生SQL可以随意修改返回参数的名称了，再也不用担心有代码强迫症的伙伴BB了