python-django rest framework框架之分頁

1. 以前django做的分頁組件當數據量特別大的時候，性能不是很高，有以下三種方式處理：
        a. 記錄當前訪問頁的最后一條數據id，往后取多少條
        b. 最多顯示120頁
        c. 對頁碼進行加密(只顯示上一頁，下一頁)

2.rest framework分頁
    from rest_framework.pagination import LimitOffsetPagination,PageNumberPagination,CursorPagination

    a. 基於limit offset做分頁
        class P1(LimitOffsetPagination):

            max_limit = 3   #每頁的最大條數
            default_limit = 2    #每頁條數
            limit_query_param = 'limit'
            offset_query_param = 'offset'
                    
        #簡單的分頁
        class IndexView(views.APIView):
            def get(self,request,*args,**kwargs):
                user_list = models.UserInfo.objects.all()
                p1 = P1()
                page_user_list = p1.paginate_queryset(queryset=user_list, request=request, view=self)
                ser = IndexSerializer(instance=page_user_list, many=True)
                return Response(ser.data) # 不含上一頁和下一頁，要手動的在url中傳參limit和offset來控制第幾頁
                # return p1.get_paginated_response(ser.data) # 含上一頁和下一頁
        #在公司中的分頁簡例    
        class IndexView(views.APIView):
            def get(self,request,*args,**kwargs):
                ret = BaseResponse()
                try:
                    user_list = models.UserInfo.objects.all()
                    p1 = P1()
                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)
                    ser = IndexSerializer(instance=page_user_list,many=True)
                    ret.data = ser.data
                    ret.next = p1.get_next_link()
                    ret.*** = 看源碼自己實現
                except Exception as e:
                    ret.code= 1001
                    ret.error = 'xxxx錯誤'
                return Response(ret.__dict__)
                
    b. 基於頁碼的分頁
        class P2(PageNumberPagination):
            # 每頁顯示的數據條數
            max_page_size = 5
            page_size = 2
            page_size_query_param = 'size'

            # 頁碼
            page_query_param = 'page'

        #用法和上面是一樣的
        class IndexView(views.APIView):
            def get(self,request,*args,**kwargs):
                ret = BaseResponse()
                try:
                    user_list = models.UserInfo.objects.all()
                    p1 = P2()
                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)
                    ser = IndexSerializer(instance=page_user_list,many=True)
                    ret.data = ser.data
                    ret.next = p1.get_next_link()
                    ret.*** = 看源碼自己實現
                except Exception as e:
                    ret.code= 1001
                    ret.error = 'xxxx錯誤'
                return Response(ret.__dict__)

    c. 基於Cursor的分頁：記錄最后一條數據的id，往后取多少條然后再進行加密
    
        class P3(CursorPagination):
            cursor_query_param = 'cursor'
            page_size = 2
            ordering = 'id'  #排序 也可以寫成  -id 

        #用法和上面是一樣的
        class IndexView(views.APIView):
            def get(self,request,*args,**kwargs):
                ret = BaseResponse()
                try:
                    user_list = models.UserInfo.objects.all()
                    p1 = P3()
                    page_user_list = p1.paginate_queryset(queryset=user_list,request=request,view=self)
                    ser = IndexSerializer(instance=page_user_list,many=True)
                    ret.data = ser.data
                    ret.next = p1.get_next_link()
                    ret.*** = 看源碼自己實現
                except Exception as e:
                    ret.code= 1001
                    ret.error = 'xxxx錯誤'
                return Response(ret.__dict__)