MVC缓存02,使用数据层缓存,添加或修改时让缓存失效
在"MVC缓存01,使用控制器缓存或数据层缓存"中,在数据层中可以设置缓存的有效时间。但这个还不够"智能",常常希望在编辑或创建的时候使缓存失效,加载新的数据。
□ 思路
1、缓存是以键值<string, object>存放的,在创建缓存的时候,先把IDictionary<int,T>作为缓存内容存储,int为T的主键。
2、EF上下文保存的时候时候把变化保存到数据库,并更新缓存中的内容。
● 先找出上下文中状态为added或modified的实体:var changeobjects
● 把变化保存数据到数据库:context.SaveChanges()
● 根据缓存key获取类型为IDictionary<int,T>的缓存内容:var cacheData = Cache.Get("vehicles") as Dictionary<int, Vehicle>;
● 最后遍历这些变化的实体,更新缓存项:cacheData[vehicle.Id] = vehicle;
□ 缓存接口
public interface ICacheProvider
{
object Get(string key);
void Set(string key, object data, int cacheTime);
bool IsSet(string key);
void Invalidate(string key);
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ 缓存接口实现
围绕using System.Runtime.Caching的MemoryCache.Default返回类型为ObjectCache的缓存属性实现缓存接口:获取缓存项、设置缓存、判断是否设置缓存、清空缓存。
using System;
using System.Runtime.Caching;
namespace MvcApplication1.Cache
{
public class DefaultCacheProvider : ICacheProvider
{
private ObjectCache Cache
{
get { return MemoryCache.Default; }
}
public object Get(string key)
{
return Cache[key];
}
public void Set(string key, object data, int cacheTime)
{
CacheItemPolicy policy = new CacheItemPolicy();
policy.AbsoluteExpiration = DateTime.Now + TimeSpan.FromMinutes(cacheTime);
Cache.Add(new CacheItem(key, data), policy);
}
public bool IsSet(string key)
{
return (Cache[key] != null);
}
public void Invalidate(string key)
{
Cache.Remove(key);
}
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ Model
public partial class Vehicle
{
public int Id { get; set; }
public string Name { get; set; }
public decimal Price { get; set; }
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ 针对Vehicle的Repositoy接口:
using System.Collections.Generic;
using MvcApplication1.Models;
namespace MvcApplication1.Repository
{
public interface IVehicleRepository
{
void ClearCache();
IEnumerable<Vehicle> GetVehicles();
void Insert(Vehicle vehicle);
void Update(Vehicle vehicle);
void SaveChanges();
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ 针对Vehicle的Repositoy接口实现:
using System.Collections.Generic;
using System.Data;
using System.Data.Entity.Infrastructure;
using System.Linq;
using MvcApplication1.Cache;
using MvcApplication1.Models;
namespace MvcApplication1.Repository
{
public class VehicleRepository : IVehicleRepository
{
protected DemoEntities DataContext { get; private set; }
public ICacheProvider Cache { get; set; }
public VehicleRepository() : this(new DefaultCacheProvider())
{
}
public VehicleRepository(ICacheProvider cacheProvider)
{
this.DataContext = new DemoEntities();
this.Cache = cacheProvider;
}
public void ClearCache()
{
Cache.Invalidate("vehicles");
}
public System.Collections.Generic.IEnumerable<Models.Vehicle> GetVehicles()
{
var vehicles = Cache.Get("vehicles") as IDictionary<int, Vehicle>;
if (vehicles == null)
{
vehicles = DataContext.Vehicle.ToDictionary(v => v.Id);
if (vehicles.Any())
{
Cache.Set("vehicles",vehicles,30);
}
}
return vehicles.Values;
}
public void Update(Vehicle vehicle)
{
if (vehicle != null)
{
DataContext.Set<Vehicle>().Attach(vehicle);
DataContext.Entry(vehicle).State = EntityState.Modified;
}
}
public void Insert(Vehicle vehicle)
{
DataContext.Set<Vehicle>().Add(vehicle);
}
public void SaveChanges()
{
//获取上下文中EntityState状态为added或modified的Vehicle
var changeobjects = DataContext.ChangeTracker.Entries<Vehicle>();
//把变化保存到数据库
DataContext.SaveChanges();
//更新缓存中相关的Vehicle
var cacheData = Cache.Get("vehicles") as Dictionary<int, Vehicle>;
if (cacheData != null)
{
foreach (var item in changeobjects)
{
var vehicle = item.Entity as Vehicle;
cacheData[vehicle.Id] = vehicle;
}
}
}
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
在保存缓存Cache.Set("vehicles",vehicles,30)之前,把从上下文获取到的数据转换成IDictionary<int,T>类型vehicles = DataContext.Vehicle.ToDictionary(v => v.Id);
□ HomeController
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models;
using MvcApplication1.Repository;
namespace MvcApplication1.Controllers
{
public class HomeController : Controller
{
public IVehicleRepository Repository { get; set; }
public HomeController(IVehicleRepository repository)
{
this.Repository = repository;
}
public HomeController() : this(new VehicleRepository())
{
}
public ActionResult Index()
{
return View(Repository.GetVehicles());
}
[HttpPost]
public ActionResult Index(FormCollection form)
{
Repository.ClearCache();
return RedirectToAction("Index");
}
public ActionResult Edit(int id)
{
var vehicle = Repository.GetVehicles().Single(v => v.Id == id);
return View(vehicle);
}
[HttpPost]
public ActionResult Edit(Vehicle vehicle)
{
Repository.Update(vehicle);
Repository.SaveChanges();
return RedirectToAction("Index");
}
public ActionResult Create()
{
return View(new Vehicle());
}
[HttpPost]
public ActionResult Create(Vehicle vehicle)
{
Repository.Insert(vehicle);
Repository.SaveChanges();
return RedirectToAction("Index");
}
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ Home/Index.cshtml
@model IEnumerable<MvcApplication1.Models.Vehicle>
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<style type="text/css">
table td {
border-collapse: collapse;
border: solid 1px black;
}
</style>
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<th>编号</th>
<th>车型</th>
<th>价格</th>
<th></th>
</tr>
@foreach (var vehicle in Model)
{
<tr>
<td>@vehicle.Id.ToString()</td>
<td>@vehicle.Name</td>
<td>@string.Format("{0:c}",vehicle.Price)</td>
<td>
@Html.ActionLink("编辑", "Edit", new { id=vehicle.Id })
</td>
</tr>
}
</table>
@using (Html.BeginForm())
{
<input type="submit" value="使缓存失效重新获取数据库数据" id="InvalidButton" name="InvalidButton"/>
}
<p>
@Html.ActionLink("创建", "Create")
</p>
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
□ Home/Create.cshtml
展开@model MvcApplication1.Models.Vehicle @{
ViewBag.Title = "Create";
Layout = "~/Views/Shared/_Layout.cshtml";
} <h2>Create</h2> @using (Html.BeginForm()) {
@Html.ValidationSummary(true) <fieldset>
<legend>Vehicle</legend> <div class="editor-label">
@Html.LabelFor(model => model.Name)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Name)
@Html.ValidationMessageFor(model => model.Name)
</div> <div class="editor-label">
@Html.LabelFor(model => model.Price)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Price)
@Html.ValidationMessageFor(model => model.Price)
</div> <p>
<input type="submit" value="Create" />
</p>
</fieldset>
} @section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
□ Home/Edit.cshtml
展开@model MvcApplication1.Models.Vehicle @{
ViewBag.Title = "Edit";
Layout = "~/Views/Shared/_Layout.cshtml";
} <h2>Edit</h2> @using (Html.BeginForm()) {
@Html.ValidationSummary(true) <fieldset>
<legend>Vehicle</legend> @Html.HiddenFor(model => model.Id) <div class="editor-label">
@Html.LabelFor(model => model.Name)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Name)
@Html.ValidationMessageFor(model => model.Name)
</div> <div class="editor-label">
@Html.LabelFor(model => model.Price)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Price)
@Html.ValidationMessageFor(model => model.Price)
</div> <p>
<input type="submit" value="Save" />
</p>
</fieldset>
} @section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
□ 结果:
创建或修改之前:
编辑更新:
创建:
编辑创建成功后:
□ 参考资料
※ DATA CACHING WITH .NET 4.0 AND ASP.NET MVC – PART 2
MVC缓存02,使用数据层缓存,添加或修改时让缓存失效的更多相关文章
- MVC缓存,使用数据层缓存,添加或修改时让缓存失效
在"MVC缓存01,运用控制器缓存或数据层缓存"中,在数据层中可以设置缓存的有用时刻.但这个还不够"智能",常常期望在修改或创立的时分使缓存失效,加载新的数据. ...
- spring mvc 的jpa JpaRepository数据层 访问方式汇总
本文转载至:http://perfy315.iteye.com/blog/1460226 AppleFramework在数据访问控制层采用了Spring Data作为这一层的解决方案,下面就对Spri ...
- mvc EF 从数据库更新实体,添加视图实体时添加不上的问题
视图对象没有一列为非null的,解决办法,在视图中,将某一列排除为null的可能,比如:isnull(te,1),即可.
- XML中 添加或修改时 xmlns="" 怎么删除
//创建节点时 记得加上 ---> xmldoc.DocumentElement.NamespaceURI XmlElement url = xmldoc.CreateElement(&quo ...
- [开源]OSharpNS 步步为营系列 - 2. 添加业务数据层
什么是OSharp OSharpNS全称OSharp Framework with .NetStandard2.0,是一个基于.NetStandard2.0开发的一个.NetCore快速开发框架.这个 ...
- Caffe实现多标签输入,添加数据层(data layer)
因为之前遇到了sequence learning问题(CRNN),里面涉及到一张图对应多个标签.Caffe源码本身是不支持多类标签数据的输入的. 如果之前习惯调用脚本create_imagenet.s ...
- php yaf框架扩展实践五——数据层
从狭义角度上来理解数据层就是数据库,比较广义的理解来看数据库.远程数据.文件等都可以看做数据层.项目初期的时候一般单一的数据库就可以了,随着流量的增大就要对数据层做很多的改进,例如增加从库分散读压力, ...
- MVC缓存01,使用控制器缓存或数据层缓存
对一些浏览频次多.数据量大的数据,使用缓存会比较好,而对一些浏览频次低,或内容因用户不同的,不太适合使用缓存. 在控制器层面,MVC为我们提供了OutputCacheAttribute特性:在数据 ...
- [NewLife.XCode]数据层缓存(网站性能翻10倍)
NewLife.XCode是一个有10多年历史的开源数据中间件,支持nfx/netcore,由新生命团队(2002~2019)开发完成并维护至今,以下简称XCode. 整个系列教程会大量结合示例代码和 ...
随机推荐
- BZOJ1455——罗马游戏
1.题目大意:维护一个数据结构,可以实现合并操作,还能询问最小值 2.分析:这种问题当然是可并堆啦 随便写了一个左偏树QAQ #include <cstdio> #include < ...
- iOS 不规则的ImageView
http://blog.csdn.net/kevinpake/article/details/41205715 我们在做iOS开发的时候,往往需要实现不规则形状的头像,如: 那如何去实现? 通常图片都 ...
- jQuery源码笔记(一):jQuery的整体结构
jQuery 是一个非常优秀的 JS 库,与 Prototype,YUI,Mootools 等众多的 Js 类库相比,它剑走偏锋,从 web 开发的实用角度出发,抛除了其它 Lib 中一些中看但不实用 ...
- Oracle Redo
Redo log 重做日志在Oracle数据库中,有一种日志文件叫做重做日志文件,他就是大家俗称的:redolog.在redolog中又分为两种:在线重做日志与归档日志. ONLINE Redo lo ...
- 在Fedora 20 上安装Mysql并初始化root密码
[root@localhost ~]# yum -y install community-mysql-server #安装数据库 已加载插件:langpacks, refresh-packagekit ...
- SNMP详解
简单网络管理协议(SNMP)是TCP/IP协议簇的一个应用层协议.在1988年被制定,并被Internet体系结构委员会(IAB)采纳作为一个短期的网络管理解决方案:由于SNMP的简单性,在Inter ...
- 剑指Offer 二叉树中和为某一值的路径(dfs)
题目描述 输入一颗二叉树和一个整数,打印出二叉树中结点值的和为输入整数的所有路径.路径定义为从树的根结点开始往下一直到叶结点所经过的结点形成一条路径. 思路: 递归,然后深搜,因为题目定义的, ...
- windows添加linux 启动引导项
需要软件: EasyBCD 下载地址: http://pan.baidu.com/s/1c20v1GO 在windows 下安装上述软件. 然后打开,语言的话现在中文即可. 可以看到如下画面: 1.选 ...
- 关于ubuntukylin安装后界面中英文混杂的问题
起因 一直使用的是ubuntu原版的系统,ubuntukylin出来后也没用使用过.一次去其论坛逛了一圈之后决定使用一下. 安装后的截面和ubuntu原版的差不多,还是挺漂亮的. 但是有一个问题是,安 ...
- 数据库多对多关联表(Python&MySQL)
Python Python对MySQL数据库操作使用的是sqlalchemy这个ORM框架 #一本书可以有多个作者,一个作者又可以出版多本书 from sqlalchemy import Table, ...