【django后端分离】mysql原生查询命令后，RawQueryset类型的自定义序列化返回json格式

1：设置mysql原生分页

# 监控系统首页显示分页
def MyPagination(limitid,offsetid):
    limitid =str(limitid)
    offsetid =str(offsetid)

　　 # 这里是mysql原生代码
    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


# 用于测试调用
ret = MyPagination(1,2)
print(ret)


返回结果是： # 这里只是确认下参数是否被调用进去
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;   # 从第1个取 取2个

2：GET请求连接上找到传入的limit与offset:

from utils import orm  # 导入上面的分页连接，带参数调用这个方法


# 从第offsetid开始取，取limitid个
        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：序列化查询的RawQueryset类型，返回json格式：

# 序列化
        json_data = {}
        data_list = []
        for obj in obj_rawqueryset:
            data = {}     # 要在遍历里面创建字典用于存数据
            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)

# 返回给前端的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"
        }
    ]
}