paginator

How to implement a paginator that doesn't call count(*)

好久不见. 提交于 2021-02-18 05:11:50
问题 I am working on a django website that has a MySQL innodb backend. We have hundreds of thousands of records in several of our tables and this is causing some site stability/performance issues in the admin. Specifically, django likes to make count(*) queries when creating the paginators, and this is causing lots of problems. With Django 1.3.x, they started to allow for custom pagination classes to be provided. So, I'm interested in finding a way to appropriately speed up or eliminate these

How to implement a paginator that doesn't call count(*)

纵饮孤独 提交于 2021-02-18 05:09:46
问题 I am working on a django website that has a MySQL innodb backend. We have hundreds of thousands of records in several of our tables and this is causing some site stability/performance issues in the admin. Specifically, django likes to make count(*) queries when creating the paginators, and this is causing lots of problems. With Django 1.3.x, they started to allow for custom pagination classes to be provided. So, I'm interested in finding a way to appropriately speed up or eliminate these

django进阶

≡放荡痞女 提交于 2021-02-14 23:17:16
Model 到目前为止,当我们的程序涉及到数据库相关操作时,我们一般都会这么搞: 创建数据库,设计表结构和字段 使用 MySQLdb 来连接数据库,并编写数据访问层代码 业务逻辑层去调用数据访问层执行数据库操作 import MySQLdb def GetList(sql): db = MySQLdb.connect(user='root', db='wupeiqidb', passwd='1234', host='localhost') cursor = db.cursor() cursor.execute(sql) data = cursor.fetchall() db.close() return data def GetSingle(sql): db = MySQLdb.connect(user='root', db='wupeiqidb', passwd='1234', host='localhost') cursor = db.cursor() cursor.execute(sql) data = cursor.fetchone() db.close() return data    django为使用一种新的方式,即:关系对象映射(Object Relational Mapping,简称ORM)。   PHP:activerecord   Java:Hibernate

tp5的 LayUI分页样式实现

落爺英雄遲暮 提交于 2021-02-12 08:28:49
1.先配置你的分页参数: //分页配置 'paginate' => [ 'type' => 'Layui' , 'var_page' => 'page' , 'list_rows' => 15 , 'newstyle' => true , ], 2. 下载文件(Layui.php),并复制到 \thinkphp\library\think\paginator\driver 3. 模板文件里正常使用分页即可 PHP: // 获取分页显示 $page = $inquiry_list->render(); // 模板变量赋值 $this->assign('list', $inquiry_list); $this->assign('page', $page); HTML: <div class="layui-box layui-laypage layui-laypage-default">{$page}</div>  分页源码:Layui.php <?php namespace think\paginator\driver; use think\Paginator; class Layui extends Paginator { /** * 上一页按钮 * @param string $text * @return string */ protected function

Pagination分页

ⅰ亾dé卋堺 提交于 2021-01-14 10:14:40
基本语法 下面展示Paginator的基本使用 >>> from django.core.paginator import Paginator >>> objects = ['john', 'paul', 'george', 'ringo'] >>> p = Paginator(objects, 2) >>> p.count 4 >>> p.num_pages 2 >>> type(p.page_range) <class 'range_iterator'> >>> p.page_range range(1, 3) >>> page1 = p.page(1) >>> page1 <Page 1 of 2> >>> page1.object_list ['john', 'paul'] >>> page2 = p.page(2) >>> page2.object_list ['george', 'ringo'] >>> page2.has_next() False >>> page2.has_previous() True >>> page2.has_other_pages() True >>> page2.next_page_number() Traceback (most recent call last): ... EmptyPage: That page contains no

Django与ajax、分页器

瘦欲@ 提交于 2021-01-07 05:48:57
ajax简单数据响应 ajax请求,后台只需要返回信息,所以不会出现render、redirect 模板层: $('.btn').click( function () { $.ajax({ url: '/ajaxload/' , // 请求路径 type: 'get|post' , // 请求方式 data: { // get和post都以data字典方式携带数据 usr: 'abc' , pwd: '123' , }, success: function (data) { // data为string类型数据 }, error: function (e) { // 请求失败分支 } }) }) view层: def ajax_load(request): if request.is_ajax(): if request.method == ' GET ' : usr = request.GET.get( ' usr ' , None) pwd = request.GET.get( ' pwd ' , None) if request.method == ' POST ' : usr = request.POST.get( ' usr ' , None) pwd = request.POST.get( ' pwd ' , None) return HttpResponse( '

Python学习(四十一)—— Djago进阶

女生的网名这么多〃 提交于 2021-01-02 19:18:57
一、分页 Django的分页器(paginator) view from django.shortcuts import render,HttpResponse # Create your views here. from app01.models import * from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger def index(request): ''' 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) ''' ''' 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) #页码的列表 page1=paginator.page(1)

原生js删除元素

萝らか妹 提交于 2020-11-24 03:04:07
//删除id var idObject = document.getElementById('sidebar'); if (idObject != null) idObject.parentNode.removeChild(idObject); //通过class获取元素 paras = document.getElementsByClassName('paginator'); for(i=0;i<paras.length;i++){ //删除元素 元素.parentNode.removeChild(元素); if (paras[i] != null) paras[i].parentNode.removeChild( paras[i]); } //清空一个元素,即删除一个元素的所有子元素 function removeAllChild() { var div = document.getElementById("div1"); while(div.hasChildNodes()) //当div下还存在子节点时 循环继续 { div.removeChild(div.firstChild); } } 原理很简单,就是不断的判断要清空的div还有没有子节点,有的话就删除一个子节点(这里是它的首个子节点),直到删除完毕为止。 //封装的方法 function removeElement(

Angular Material Paginator is undefined

别来无恙 提交于 2020-08-09 17:20:44
问题 I use Angular Material (MatTable, MatPaginator). when i log in to my application and my component view is loaded, i get the following error in my browser debugger: ERROR TypeError: "_this._paginator is undefined; can't access its "pageIndex" property" ExampleDataSource http://localhost:4200/main.js:1446 __tryOrUnsub http://localhost:4200/vendor.js:160732 next http://localhost:4200/vendor.js:160670 _next http://localhost:4200/vendor.js:160603 next http://localhost:4200/vendor.js:160578

PHP: Generate Laravel Paginator Secure (HTTPS) Links

感情迁移 提交于 2020-07-15 02:07:45
问题 I'm developing an app using Laravel 4.2 over HTTPS with secure routes and redirects. I'm using Paginator to paginate results, but the links rendered in the view points to the http pages, how can we force Paginator to generate https links? 回答1: I had this issue today and found this global solution. In your AppServiceProvider::boot method you can add the following to force https on pagination links $this->app['request']->server->set('HTTPS','on'); 回答2: If your current page is served over HTTPS,