一：filter查询可以方便的查询出我们需要使用的信息：

defblogdetail(request,aricle_id):

contenx={}

detail= contenx['detail'] = get_object_or_404(Blog,pk =aricle_id)

contenx['blog_previous'] = Blog.objects.filter(create_time__gt = detail.create_time).last()#得到上一页信息

contenx['blog_next'] = Blog.objects.filter(create_time__lt = detail.create_time).first()#下一页信息

contenx['detail'] =detailreturn render_to_response('blog/detail.html',contenx)

一、下面来看看：filter查询：

1.__contains(包含)

shell命令下查询：Blog.objects.filter(title__contains ="django")------------------>返回一个queryset[]查询(查询集)只能输入一个值。加上一个"i"后不区别大小写【sql等数据库中】

2.__in (其中之一，可以传入一个列表，传多个值。)

Blog.objects.filter(id__in = [3,6,9])

3.__range(一个范围，使用元祖)：

> Blog.objects.filter(id__range =(30,45))

二、前面讲的是包含的查询，下面来看看不包含的查询：

exclude方法为不包含的：

Blog.objects.exclude(id=3)

三、日期类型查询

Blog.objects.filter(create_time__year = 2018)------------->查询年为2018年的内容

Blog.objects.filter(create_time__month=3)----------------->查询月

四、日期查询类型只是筛选了条件，怎么让条件在前端显示呢？django提供了一个dates方法：

Blog.objects.dates('create_time', 'year','DESC')--------------------->分别为：时间字段，查询返回年year，年月month，年月日day，最后一个参数是排序方式ASC正序，DESC倒序。

defblog_with_date(request,year,month):

contenx={}

blogs= Blog.objects.filter(create_time__year = year ,create_time__month =month)

paginator= Paginator(blogs, settings.EACH_OF_BLOGS_NUMBER)#每10篇文章分一页

page_num = request.GET.get('page',1)#GET方法获得url参数?page1 page是参数需要带引号

page_of_blogs = paginator.get_page(page_num)#get_page方法处理用户输入的错误值

current_page_num = page_of_blogs.number#获得当前页

#比较截取到想要的那个数到最小值1时用小的值和1作比较生成一个从小到当前的值

range_page = list(range(max(current_page_num-2,1),current_page_num))+\

list(range(current_page_num, min(current_page_num+2,paginator.num_pages)+1))#range(当前到---->想要的那个值取到最后最小的那个值)

#添加省略号

if range_page[0]-1>=2:

range_page.insert(0,'...')if paginator.num_pages-range_page[-1]>=2:

range_page.append('...')#添加首页和尾页

if range_page[0]!=1:

range_page.insert(0,1)if range_page[-1]!=paginator.num_pages:

range_page.append(paginator.num_pages)

contenx['blogs_with_date'] = '%s年%s月'%(year,month)

contenx['blogs'] =page_of_blogs.object_list

contenx['page_of_blogs'] =page_of_blogs

contenx['range_page'] =range_page

contenx['blogtypes']= Blogtype.objects.all()#获取所有的分类

contenx['blog_dates'] = Blog.objects.dates('create_time','month','DESC')return render_to_response('blog/blog_with_date.html',contenx)

五、代码整理公共部分提取

from django.shortcuts importrender_to_response,get_object_or_404from .models importBlog,Blogtypefrom django.conf importsettingsfrom django.core.paginator importPaginator#Create your views here.#EACH_OF_BLOGS_NUMBER = 7

defget_blog_artacile_common_date(request,blogs):

paginator= Paginator(blogs, settings.EACH_OF_BLOGS_NUMBER)#每10篇文章分一页

page_num = request.GET.get('page',1)#GET方法获得url参数?page1 page是参数需要带引号

page_of_blogs = paginator.get_page(page_num)#get_page方法处理用户输入的错误值

current_page_num = page_of_blogs.number#获得当前页

#比较截取到想要的那个数到最小值1时用小的值和1作比较生成一个从小到当前的值

range_page = list(range(max(current_page_num-2,1),current_page_num))+\

list(range(current_page_num, min(current_page_num+2,paginator.num_pages)+1))#range(当前到---->想要的那个值取到最后最小的那个值)

#添加省略号

if range_page[0]-1>=2:

range_page.insert(0,'...')if paginator.num_pages-range_page[-1]>=2:

range_page.append('...')#添加首页和尾页

if range_page[0]!=1:

range_page.insert(0,1)if range_page[-1]!=paginator.num_pages:

range_page.append(paginator.num_pages)

contenx={}

contenx['page_of_blogs'] =page_of_blogs

contenx['blogs'] = page_of_blogs.object_list#获取符合参数所有的文章

#contenx['count'] = Blog.objects.all().count()

contenx['blog_dates'] = Blog.objects.dates('create_time','month','DESC')

contenx['range_page'] =range_page

contenx['blogtypes'] = Blogtype.objects.all()#获取所有的分类

returncontenxdefbloglist(request):

blogs=Blog.objects.all()

contenx=get_blog_artacile_common_date(request,blogs)return render_to_response('blog/list.html',contenx)defblog_with_type(request,typename_pk):

typename= get_object_or_404(Blogtype,pk = typename_pk)#拿到传入的类型参数

blogs = Blog.objects.filter(typename=typename)

contenx=get_blog_artacile_common_date(request,blogs)

contenx['typename'] = typename#显示分类列

return render_to_response('blog/blog_with_type.html',contenx)defblog_with_date(request,year,month):

blogs= Blog.objects.filter(create_time__year = year ,create_time__month =month)

contenx=get_blog_artacile_common_date(request,blogs)

contenx['blogs_with_date'] = '%s年%s月'%(year,month)return render_to_response('blog/blog_with_date.html',contenx)defblogdetail(request,aricle_id):

contenx={}

detail= get_object_or_404(Blog,pk =aricle_id)

contenx['blog_previous'] = Blog.objects.filter(create_time__gt = detail.create_time).last()#得到上一页信息

contenx['blog_next'] = Blog.objects.filter(create_time__lt = detail.create_time).first()#下一页信息

contenx['detail'] =detailreturn render_to_response('blog/detail.html',contenx)

原来代码：

defbloglist(request):

blogs=Blog.objects.all()

paginator= Paginator(blogs, settings.EACH_OF_BLOGS_NUMBER)#每10篇文章分一页

page_num = request.GET.get('page',1)#GET方法获得url参数?page1 page是参数需要带引号

page_of_blogs = paginator.get_page(page_num)#get_page方法处理用户输入的错误值

current_page_num = page_of_blogs.number#获得当前页

#比较截取到想要的那个数到最小值1时用小的值和1作比较生成一个从小到当前的值

range_page = list(range(max(current_page_num-2,1),current_page_num))+\

list(range(current_page_num, min(current_page_num+2,paginator.num_pages)+1))#range(当前到---->想要的那个值取到最后最小的那个值)

#添加省略号

if range_page[0]-1>=2:

range_page.insert(0,'...')if paginator.num_pages-range_page[-1]>=2:

range_page.append('...')#添加首页和尾页

if range_page[0]!=1:

range_page.insert(0,1)if range_page[-1]!=paginator.num_pages:

range_page.append(paginator.num_pages)

contenx={}

contenx['page_of_blogs'] =page_of_blogs

contenx['blogs'] = page_of_blogs.object_list#获取符合参数所有的文章

#contenx['count'] = Blog.objects.all().count()

contenx['blog_dates'] = Blog.objects.dates('create_time','month','DESC')

contenx['range_page'] =range_page

contenx['blogtypes'] = Blogtype.objects.all()#获取所有的分类

return render_to_response('blog/list.html',contenx)defblog_with_type(request,typename_pk):

contenx={}

typename= get_object_or_404(Blogtype,pk = typename_pk)#拿到传入的类型参数

blogs = Blog.objects.filter(typename=typename)

paginator= Paginator(blogs, settings.EACH_OF_BLOGS_NUMBER)#每10篇文章分一页

page_num = request.GET.get('page',1)#GET方法获得url参数?page1 page是参数需要带引号

page_of_blogs = paginator.get_page(page_num)#get_page方法处理用户输入的错误值

current_page_num = page_of_blogs.number#获得当前页

#比较截取到想要的那个数到最小值1时用小的值和1作比较生成一个从小到当前的值

range_page = list(range(max(current_page_num-2,1),current_page_num))+\

list(range(current_page_num, min(current_page_num+2,paginator.num_pages)+1))#range(当前到---->想要的那个值取到最后最小的那个值)

#添加省略号

if range_page[0]-1>=2:

range_page.insert(0,'...')if paginator.num_pages-range_page[-1]>=2:

range_page.append('...')#添加首页和尾页

if range_page[0]!=1:

range_page.insert(0,1)if range_page[-1]!=paginator.num_pages:

range_page.append(paginator.num_pages)

contenx['page_of_blogs'] =page_of_blogs

contenx['blogs'] = page_of_blogs.object_list#获取符合参数所有的文章

#contenx['count'] = Blog.objects.all().count()

contenx['range_page'] =range_page

contenx['typename'] = typename#显示分类列

contenx['blogtypes']= Blogtype.objects.all()#获取所有的分类

contenx['blog_dates'] = Blog.objects.dates('create_time','month','DESC')return render_to_response('blog/blog_with_type.html',contenx)defblog_with_date(request,year,month):

contenx={}

blogs= Blog.objects.filter(create_time__year = year ,create_time__month =month)

paginator= Paginator(blogs, settings.EACH_OF_BLOGS_NUMBER)#每10篇文章分一页

page_num = request.GET.get('page',1)#GET方法获得url参数?page1 page是参数需要带引号

page_of_blogs = paginator.get_page(page_num)#get_page方法处理用户输入的错误值

current_page_num = page_of_blogs.number#获得当前页

#比较截取到想要的那个数到最小值1时用小的值和1作比较生成一个从小到当前的值

range_page = list(range(max(current_page_num-2,1),current_page_num))+\

list(range(current_page_num, min(current_page_num+2,paginator.num_pages)+1))#range(当前到---->想要的那个值取到最后最小的那个值)

#添加省略号

if range_page[0]-1>=2:

range_page.insert(0,'...')if paginator.num_pages-range_page[-1]>=2:

range_page.append('...')#添加首页和尾页

if range_page[0]!=1:

range_page.insert(0,1)if range_page[-1]!=paginator.num_pages:

range_page.append(paginator.num_pages)

contenx['blogs_with_date'] = '%s年%s月'%(year,month)

contenx['blogs'] =page_of_blogs.object_list

contenx['page_of_blogs'] =page_of_blogs

contenx['range_page'] =range_page

contenx['blogtypes']= Blogtype.objects.all()#获取所有的分类

contenx['blog_dates'] = Blog.objects.dates('create_time','month','DESC')return render_to_response('blog/blog_with_date.html',contenx)