【django后端分離】mysql原生查詢命令后，RawQueryset類型的自定義序列化返回json格式

1：設置mysql原生分頁

# 監控系統首頁顯示分頁
def MyPagination(limitid,offsetid):
    limitid =str(limitid)
    offsetid =str(offsetid)

　　 # 這里是mysql原生代碼
    show_goods =  "select dal_keywordtable.* from (select asin, min(ranking) as minRanking from `dal_keywordtable` GROUP BY asin) t2 LEFT JOIN dal_keywordtable on t2.asin = dal_keywordtable.asin and t2.minRanking = dal_keywordtable.ranking limit  " + limitid + " offset " + offsetid + ";"
    return show_goods


# 用於測試調用
ret = MyPagination(1,2)
print(ret)


返回結果是： # 這里只是確認下參數是否被調用進去
select dal_keywordtable.* from (select asin, min(ranking) as minRanking from `dal_keywordtable` GROUP BY asin) t2 LEFT JOIN dal_keywordtable on t2.asin = dal_keywordtable.asin and t2.minRanking = dal_keywordtable.ranking limit  1 offset 2;   # 從第1個取 取2個

2：GET請求連接上找到傳入的limit與offset:

from utils import orm  # 導入上面的分頁連接，帶參數調用這個方法


# 從第offsetid開始取，取limitid個
        limitid = request._request.GET.get("limit")
        offsetid = request._request.GET.get("offset")
        raw_Pagination =MyPagination(limitid,offsetid)
        obj_rawqueryset = models.KeyWordTable.objects.raw(raw_Pagination) # 得到

3：序列化查詢的RawQueryset類型，返回json格式：

# 序列化
        json_data = {}
        data_list = []
        for obj in obj_rawqueryset:
            data = {}     # 要在遍歷里面創建字典用於存數據
            print(obj)
            data["goods_title"] = obj.goods_title
            data["src"] = obj.src
            data["single_keyword"] = obj.single_keyword
            data["asin"] = obj.asin
            data["seed_asin"] = obj.seed_asin
            data["ranking"] = obj.ranking
            data["position"] = obj.position
            data["time"] = obj.time.strftime('%Y-%m-%d')
            data_list.append(data)
        json_data['data'] = data_list
        return Response(json_data)

# 返回給前端的json格式：
{
    "data": [
        {
            "goods_title": "Sloggers Women's Waterproof Rain and Garden Shoe with Comfort Insole, Blue Swirls, Size 6, Style 5117SWL06",
            "src": "https://images-na.ssl-images-amazon.com/images/I/41CSEL0bHeL._SS36_.jpg",
            "single_keyword": null,
            "asin": "B077TDGR51",
            "seed_asin": "B01H7X9ASA",
            "ranking": 666666,
            "position": null,
            "time": "2019-12-02"
        },
        {
            "goods_title": "S1loggers Women's Waterproof Rain and Garden Shoe with Comfort Insole, Blue Swirls, Size 6, Style 5117SWL06",
            "src": "https://images-na.ssl-images-amazon.com/images/I/41CSEL0bHeL._SS36_.jpg",
            "single_keyword": null,
            "asin": "B077TDGR53",
            "seed_asin": "B01H7X9ASB",
            "ranking": 666666,
            "position": null,
            "time": "2019-12-02"
        },
        {
            "goods_title": "S2loggers Women's Waterproof Rain and Garden Shoe with Comfort Insole, Blue Swirls, Size 6, Style 5117SWL06",
            "src": "https://images-na.ssl-images-amazon.com/images/I/41CSEL0bHeL._SS36_.jpg",
            "single_keyword": null,
            "asin": "B077TDGR52",
            "seed_asin": "B01H7X9ASC",
            "ranking": 2,
            "position": null,
            "time": "2019-12-03"
        }
    ]
}