分页

Django的分页器（paginator）

view

 django.shortcuts <span style="color: #008000;">#<span style="color: #008000;"> Create your views here.

<span style="color: #0000ff;">from app01.models <span style="color: #0000ff;">import *

<span style="color: #0000ff;">from django.core.paginator <span style="color: #0000ff;">import<span style="color: #000000;"> Paginator,EmptyPage,PageNotAnInteger
<span style="color: #0000ff;">def<span style="color: #000000;"> index(request):
</span><span style="color: #800000;"&gt;'''</span><span style="color: #800000;"&gt;
批量导入数据:

Booklist=[]
for i in range(100):
    Booklist.append(Book(title="book"+str(i),price=30+i*i))
Book.objects.bulk_create(Booklist)
</span><span style="color: #800000;"&gt;'''</span>

<span style="color: #800000;"&gt;'''</span><span style="color: #800000;"&gt;
分页器的使用:
book_list=Book.objects.all()

paginator = Paginator(book_list,10)

print("count:",paginator.count)           #数据总数
print("num_pages",paginator.num_pages)    #总页数
print("page_range",paginator.page_range)  #<a href="/tag/yema/" target="_blank" class="keywords">页码</a>的列表



page1=paginator.page(1) #第1页的page对象
for i in page1:         #遍历第1页的所有数据对象
    print(i)

print(page1.object_list) #第1页的所有数据


page2=paginator.page(2)

print(page2.has_next())            #是否有<a href="/tag/xiayiye/" target="_blank" class="keywords">下一页</a>
print(page2.next_page_number())    #<a href="/tag/xiayiye/" target="_blank" class="keywords">下一页</a>的<a href="/tag/yema/" target="_blank" class="keywords">页码</a>
print(page2.has_prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s())        #是否有<a href="/tag/shangyiye/" target="_blank" class="keywords">上一页</a>
print(page2.prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s_page_number()) #<a href="/tag/shangyiye/" target="_blank" class="keywords">上一页</a>的<a href="/tag/yema/" target="_blank" class="keywords">页码</a>



# 抛错
#page=paginator.page(12)   # error:EmptyPage

#page=paginator.page("z")   # error:PageNotAnInteger

</span><span style="color: #800000;"&gt;'''</span><span style="color: #000000;"&gt;


book_list</span>=<span style="color: #000000;"&gt;Book.objects.all()

paginator </span>= Paginator(book_list,10<span style="color: #000000;"&gt;)
page </span>= request.GET.get(<span style="color: #800000;"&gt;'</span><span style="color: #800000;"&gt;page</span><span style="color: #800000;"&gt;'</span>,1<span style="color: #000000;"&gt;)
currentPage</span>=<span style="color: #000000;"&gt;int(page)


</span><span style="color: #0000ff;"&gt;try</span><span style="color: #000000;"&gt;:
    </span><span style="color: #0000ff;"&gt;print</span><span style="color: #000000;"&gt;(page)
    book_list </span>=<span style="color: #000000;"&gt; paginator.page(page)
</span><span style="color: #0000ff;"&gt;except</span><span style="color: #000000;"&gt; PageNotAnInteger:
    book_list </span>= paginator.page(1<span style="color: #000000;"&gt;)
</span><span style="color: #0000ff;"&gt;except</span><span style="color: #000000;"&gt; EmptyPage:
    book_list </span>=<span style="color: #000000;"&gt; paginator.page(paginator.num_pages)


</span><span style="color: #0000ff;"&gt;return</span> render(request,<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;index.html</span><span style="color: #800000;"&gt;"</span>,{<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;book_list</span><span style="color: #800000;"&gt;"</span>:book_list,<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;paginator</span><span style="color: #800000;"&gt;"</span>:paginator,<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;currentPage</span><span style="color: #800000;"&gt;"</span>:currentPage})</pre>
<div class="cnblogs_code_toolbar">

Meta Title integrity

<span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;h4</span><span style="color: #0000ff;"&gt;></span><a href="/tag/fenye/" target="_blank" class="keywords">分页</a>器<span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;h4</span><span style="color: #0000ff;"&gt;></span>
<span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;ul</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;

    {% for book in book_list %}
         </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span>{{ book.title }} -----{{ book.price }}<span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
    {% endfor %}

 </span><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;ul</span><span style="color: #0000ff;"&gt;></span>


<span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;ul </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="pagination"</span><span style="color: #ff0000;"&gt; id</span><span style="color: #0000ff;"&gt;="pager"</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;

             {% if book_list.has_prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s %}
                </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="/index/?page={{ book_list.prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s_page_number }}"</span><span style="color: #0000ff;"&gt;></span><a href="/tag/shangyiye/" target="_blank" class="keywords">上一页</a><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
             {% else %}
                </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="prev<a href="/tag/IoU/" target="_blank" class="keywords">IoU</a>s disabled"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="#"</span><span style="color: #0000ff;"&gt;></span><a href="/tag/shangyiye/" target="_blank" class="keywords">上一页</a><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
             {% endif %}


             {% for num in paginator.page_range %}

                 {% if num == currentPage %}
                   </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="item active"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="/index/?page={{ num }}"</span><span style="color: #0000ff;"&gt;></span>{{ num }}<span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
                 {% else %}
                   </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="item"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="/index/?page={{ num }}"</span><span style="color: #0000ff;"&gt;></span>{{ num }}<span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;

                 {% endif %}
             {% endfor %}



             {% if book_list.has_next %}
                </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="next"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="/index/?page={{ book_list.next_page_number }}"</span><span style="color: #0000ff;"&gt;></span><a href="/tag/xiayiye/" target="_blank" class="keywords">下一页</a><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
             {% else %}
                </span><span style="color: #0000ff;"&gt;<</span><span style="color: #800000;"&gt;li </span><span style="color: #ff0000;"&gt;class</span><span style="color: #0000ff;"&gt;="next disabled"</span><span style="color: #0000ff;"&gt;><</span><span style="color: #800000;"&gt;a </span><span style="color: #ff0000;"&gt;href</span><span style="color: #0000ff;"&gt;="#"</span><span style="color: #0000ff;"&gt;></span><a href="/tag/xiayiye/" target="_blank" class="keywords">下一页</a><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;a</span><span style="color: #0000ff;"&gt;></</span><span style="color: #800000;"&gt;li</span><span style="color: #0000ff;"&gt;></span><span style="color: #000000;"&gt;
             {% endif %}

        </span><span style="color: #0000ff;"&gt;</</span><span style="color: #800000;"&gt;ul</span><span style="color: #0000ff;"&gt;></span>

</div>

</body>
</html>

扩展

book_list</span>=<span style="color: #000000;"&gt;Book.objects.all()

paginator </span>= Paginator(book_list,15<span style="color: #000000;"&gt;)
page </span>= request.GET.get(<span style="color: #800000;"&gt;'</span><span style="color: #800000;"&gt;page</span><span style="color: #800000;"&gt;'</span>,1<span style="color: #000000;"&gt;)
currentPage</span>=<span style="color: #000000;"&gt;int(page)

</span><span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;  如果页数十分多时，换另外一种<a href="/tag/xianshi/" target="_blank" class="keywords">显示</a>方式</span>
<span style="color: #0000ff;"&gt;if</span> paginator.num_pages>30<span style="color: #000000;"&gt;:

    </span><span style="color: #0000ff;"&gt;if</span> currentPage-5<1<span style="color: #000000;"&gt;:
        pageRange</span>=range(1,11<span style="color: #000000;"&gt;)
    </span><span style="color: #0000ff;"&gt;elif</span> currentPage+5><span style="color: #000000;"&gt;paginator.num_pages:
        pageRange</span>=range(currentPage-5,paginator.num_pages+1<span style="color: #000000;"&gt;)

    </span><span style="color: #0000ff;"&gt;else</span><span style="color: #000000;"&gt;:
        pageRange</span>=range(currentPage-5,currentPage+5<span style="color: #000000;"&gt;)

</span><span style="color: #0000ff;"&gt;else</span><span style="color: #000000;"&gt;:
    pageRange</span>=<span style="color: #000000;"&gt;paginator.page_range


</span><span style="color: #0000ff;"&gt;try</span><span style="color: #000000;"&gt;:
    </span><span style="color: #0000ff;"&gt;print</span><span style="color: #000000;"&gt;(page)
    book_list </span>=<span style="color: #000000;"&gt; paginator.page(page)
</span><span style="color: #0000ff;"&gt;except</span><span style="color: #000000;"&gt; PageNotAnInteger:
    book_list </span>= paginator.page(1<span style="color: #000000;"&gt;)
</span><span style="color: #0000ff;"&gt;except</span><span style="color: #000000;"&gt; EmptyPage:
    book_list </span>=<span style="color: #000000;"&gt; paginator.page(paginator.num_pages)


</span><span style="color: #0000ff;"&gt;return</span> render(request,locals())</pre>

django.utils.deprecation django.shortcuts class Md1(MiddlewareMixin):

</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_request(self,request):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md1请求</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)

def process_response(self,request,response):
print("Md1返回")
return response

class Md2(MiddlewareMixin):

</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_request(self,request):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md2请求</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)<br />        <span style="color: #008000;"&gt;#<span style="color: #008000;"&gt;return HttpResponse("Md2中断")</span></span>
</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_response(self,response):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md2返回</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
    </span><span style="color: #0000ff;"&gt;return</span> response</pre>

django.utils.deprecation django.shortcuts class Md1(MiddlewareMixin):

</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_request(self,request):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md1请求</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
    </span><span style="color: #008000;"&gt;#</span><span style="color: #008000;"&gt;return HttpResponse("Md1中断")</span>
<span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_response(self,response):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md1返回</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
    </span><span style="color: #0000ff;"&gt;return</span><span style="color: #000000;"&gt; response

</span><span style="color: #ff0000;"&gt;def process_view(self,callback_kwargs):
    print("Md1view")

class Md2(MiddlewareMixin):

</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_request(self,request):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md2请求</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
    </span><span style="color: #0000ff;"&gt;return</span> HttpResponse(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md2中断</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
</span><span style="color: #0000ff;"&gt;def</span><span style="color: #000000;"&gt; process_response(self,response):
    </span><span style="color: #0000ff;"&gt;print</span>(<span style="color: #800000;"&gt;"</span><span style="color: #800000;"&gt;Md2返回</span><span style="color: #800000;"&gt;"</span><span style="color: #000000;"&gt;)
    </span><span style="color: #0000ff;"&gt;return</span><span style="color: #000000;"&gt; response

</span><span style="color: #ff0000;"&gt;def process_view(self,callback_kwargs):
    print("Md2view")</span></pre>

def process_request(self,callback_kwargs): # return HttpResponse("hello") response=callback(request,*callback_args,**callback_kwargs) return response</pre>

def process_request(self,response): print("Md1返回") return response def process_view(self,callback_kwargs): # return HttpResponse("hello") # response=callback(request,**callback_kwargs) # return response print("md1 process_view...") def process_exception(self): print("md1 process_exception...")

def process_request(self,request): print("Md2请求") # return HttpResponse("Md2中断") def process_response(self,response): print("Md2返回") return response def process_view(self,callback_kwargs): print("md2 process_view...") def process_exception(self): print("md1 process_exception...")</pre>

Django---分页器、中间件

分页

Django的分页器（paginator）

view

index.html:

扩展

中间件

中间件的概念

自定义中间件

process_request，process_response

process_view

process_exception

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