python-django rest framework框架之分页

1. 以前django做的分页组件当数据量特别大的时候，性能不是很高，有以下三种方式处理：
        a. 记录当前访问页的最后一条数据id，往后取多少条
        b. 最多显示120页
        c. 对页码进行加密(只显示上一页，下一页)

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

    a. 基于limit offset做分页
        class P1(LimitOffsetPagination):

            max_limit = 3   #每页的最大条数
            default_limit = 2    #每页条数
            limit_query_param = ‘limit‘
            offset_query_param = ‘offset‘
                    
        #简单的分页
        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) # 不含上一页和下一页，要手动的在url中传参limit和offset来控制第几页
                # return p1.get_paginated_response(ser.data) # 含上一页和下一页
        #在公司中的分页简例    
        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.*** = 看源码自己实现
                except Exception as e:
                    ret.code= 1001
                    ret.error = ‘xxxx错误‘
                return Response(ret.__dict__)
                
    b. 基于页码的分页
        class P2(PageNumberPagination):
            # 每页显示的数据条数
            max_page_size = 5
            page_size = 2
            page_size_query_param = ‘size‘

            # 页码
            page_query_param = ‘page‘

        #用法和上面是一样的
        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.*** = 看源码自己实现
                except Exception as e:
                    ret.code= 1001
                    ret.error = ‘xxxx错误‘
                return Response(ret.__dict__)

    c. 基于Cursor的分页：记录最后一条数据的id，往后取多少条然后再进行加密
    
        class P3(CursorPagination):
            cursor_query_param = ‘cursor‘
            page_size = 2
            ordering = ‘id‘  #排序 也可以写成  -id 

        #用法和上面是一样的
        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.*** = 看源码自己实现
                except Exception as e:
                    ret.code= 1001
                    ret.error = ‘xxxx错误‘
                return Response(ret.__dict__)