Question

我的Django模型中有以下字段

class cube(models.Model):
    pid = models.IntegerField()
    lc = models.CharField(max_length=100)
    sid = models.IntegerField()
    st = models.IntegerField()
    wid = models.IntegerField()
    wt = models.IntegerField()

我有以下来自客户的输入集

input_set1对象 -

[{"sid":1,"st":7},{"sid":7,"st":5},{"sid":5,"st":9},{"sid":2,"st":7}]

input_set2 object -

[{"wid":3,"wt":5},{"wid":1,"wt":7},{"wid":4,"wt":8},{"wid":2,"wt":5},{"wid":5,"wt":5}]

以下是我的要求，即mysql表示法：

select pid,lc from cube
where (((sid=1) AND (st>=7)) AND ((sid=7) AND (sid>=5)) AND ((sid=5) AND 
(st>=9)) AND ((sid=2) AND (st>=7)))
AND (((wid=3) AND (wt>=5)) AND ((wid=1) AND (wt>=7)) AND ((wid=4) AND 
(wt>=8)) AND ((wid=2) AND (wt>=5)) AND ((wid=5) AND (wt>=5)))

输入{sid，st}和{wid，wt}集合每个最多可包含10个项目 - 像{sid，st}每个输入最多10个，{wid，wt}

相同

如何在django中编写这个sql表示法？

我想在我的视图中使用输入参数作为下面的列表，这样它对输入集来说是通用的 -

input_set1=[{1,7},{7,5},{5,9},{2,7}]
input_set2=[{3,5},{1,7},{4,8},{2,5},{5,5}]

fieldsReq=['pid','lc']
queryset=cube.objects.values_list(fieldsReq).filter(reduce(operator.and_, (Q(sid__contains=x) for x in ['3', '5', '6']),(Q(rt__contains=x) for x in ['4', '8', '3']))) #Am not sure how to write the condition here

我想将input_set1映射到{sid，st} 和input_set2到{wid，wt}，但发现写作有困难。

如何用Django表示法从mysql表中获取字段？

Answer 1

这是我对sid的尝试，它也适用于wid。

from django.db.models import Q

# original input
input = [{"sid":1,"st":7},{"sid":7,"st":5},{"sid":5,"st":9},{"sid":2,"st":7}]
# a list of Q objects
queries = [Q(sid=i['sid'], st__gte=i['st']) for i in input]
# 'AND' all conditions
sid_query = reduce(lambda x, y: x & y, queries)

fieldsReq=['pid','lc']
queryset=cube.objects.values_list(fieldsReq).filter(sid_query)

如何将列表作为输入过滤器写入django模型实例中的mysql表

1 个答案: