如何在Django中计算PostgreSQL数据库中的行数?

问题描述 投票:1回答:1

如何在Django中计算PostgreSQL数据库中的行数并使用highchart显示?

例子:我想显示从7.00am到7.00am的记录行数。我想显示从早上7.00到第二天早上7.00的记录行数。

模型:Django.com

from django.db import models
   from datetime import datetime, date

class hujan(models.Model):
    id = models.AutoField(primary_key=True)
    tanggal = models.DateTimeField(auto_now_add=True)
    dtinms = models.IntegerField()
    hujan = models.FloatField()

serializers:

from rest_framework import serializers
from .models import hujan, cahayasuhukelembapan

class hujanSerializer(serializers.ModelSerializer):
    class Meta:
        model = hujan
        fields = ('tanggal','dtinms','hujan')

视图。

from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse, JsonResponse
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.renderers import TemplateHTMLRenderer
from .models import hujan
from .serializers import hujanSerializer

def homePageView(request):
  return render(request,'homepage.html')

class hujanlistall(APIView):
    def get(self, request):
        Hujan = hujan.objects.all()
        serializer = hujanSerializer(Hujan, many=True)
        return JsonResponse(serializer.data,safe=False)
django postgresql django-rest-framework
1个回答
0
投票

修改 "views.py "文件。

import datetime
class hujanlistall(APIView):
    def get(self, request):
        Hujan = hujan.objects.filter(tanggal__range = (datetime.datetime.combine(start_date,datetime.time.min),datetime.datetime.combine(end_date, datetime.time.max)))
        RowCount = len(Hujan)
        serializer = hujanSerializer(Hujan, many=True)
        return JsonResponse(serializer.data,safe=False)
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