加入收藏 | 设为首页 | 会员中心 | 我要投稿 李大同 (https://www.lidatong.com.cn/)- 科技、建站、经验、云计算、5G、大数据,站长网!
当前位置: 首页 > 大数据 > 正文

【django后端分离】mysql原生查询命令后,RawQueryset类型的自定

发布时间:2020-12-15 17:09:15 所属栏目:大数据 来源:网络整理
导读: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 fro

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
            (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
         Response(json_data)

 返回给前端的json格式:
{
    : [
        {
            ": Sloggers Women's Waterproof Rain and Garden Shoe with Comfort Insole,Blue Swirls,Size 6,Style 5117SWL06,https://images-na.ssl-images-amazon.com/images/I/41CSEL0bHeL._SS36_.jpg: null,1)">B077TDGR51B01H7X9ASA": 6666662019-12-02
        },{
            S1loggers Women's Waterproof Rain and Garden Shoe with Comfort Insole,1)">B077TDGR53B01H7X9ASBS2loggers Women's Waterproof Rain and Garden Shoe with Comfort Insole,1)">B077TDGR52B01H7X9ASC": 22019-12-03
        }
    ]
}

?

?

(编辑:李大同)

【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容!

    推荐文章
      热点阅读