[{"data":1,"prerenderedAt":233},["ShallowReactive",2],{"tag-Cache-1":3},{"title":4,"articles":5,"hot_article":18,"month_arch":81,"total":229,"cover":230},"Cache - 独孤影的博客",[6],{"id":7,"title":8,"uri":8,"author":9,"tags":10,"created_at":15,"view_count":16,"content":17},12,"网站中Cache的使用","duguying",[11,12,13,14],"构架","Cache","网站","MVC","2014-09-23 01:01:51",5802,"\u003Cp>现在的许都网站都使用MVC构架，为了应对高并发，人们通常使用基于内存存取的Cache系统作为后端减压的应对方式。在网站的后端，主要涉及业务逻辑处理和数据库查询，而数据查询许多时候在高并发的状况下成为了性能的瓶颈。本文要讨论的是Cache如何使用才能够更加合理，更加有效。\u003C\u002Fp>\u003Cp>网站的MVC构架通常情况如下\u003Cbr\u002F>\u003Cimg src=\"\u002F\u002Fduguying.oss-cn-qingdao.aliyuncs.com\u002F2014\u002F9\u002F23\u002Fmvc_structure.png\" title=\"\" alt=\"mvc_structure.png\"\u002F>\u003Cbr\u002F>数据库(Database)处于最后端，其次是Model层，Model层是对数据库直接操作的一种封装，然后是Controller层，Controller层是专门处理业务逻辑的，获取数据是直接调用Model层中封装的各种方法，最外层是View层，负责显示数据到页面，Controller层处理完毕的的数据传到View层，由其渲染为静态页发送给用户浏览器。\u003Cbr\u002F>\u003C\u002Fp>\u003Cp>\u003Cstrong>构想一\u003C\u002Fstrong>，将Cache用于Model层中\u003Cbr\u002F>\u003Cimg src=\"\u002F\u002Fduguying.oss-cn-qingdao.aliyuncs.com\u002F2014\u002F9\u002F23\u002Fcache_in_model.png\" title=\"\" alt=\"cache_in_model.png\"\u002F>\u003Cbr\u002F>Cache用于Model层是将查询到的数据放置到Cache中，从而避免下次同样的数据需要再次去数据库执行SQL语句查询，而是直接从Cache中更快的读取数据(理论上某些SQL查询非常耗时，这样Cache效果更明显)。\u003Cbr\u002F>\u003C\u002Fp>\u003Cpre class=\"brush:go;toolbar:false\">\u002F\u002F 通过id获取文章-cached\nfunc GetArticle(id int) (Article, error) {\n\tvar err error\n\tvar art Article\n\n\tcache := config.GetCache("GetArticle.id." + fmt.Sprintf("%d", id))\n\tif cache != nil { \u002F\u002F check cache\n\t\tjson.Unmarshal([]byte(cache.(string)), &art)\n\t\treturn art, nil\n\t} else {\n\t\to := orm.NewOrm()\n\t\to.Using("default")\n\t\tart = Article{Id: id}\n\t\terr = o.Read(&art, "id")\n\n\t\tdata, _ := utils.JsonEncode(art)\n\t\tconfig.SetCache("GetArticle.id."+fmt.Sprintf("%d", id), data, 600)\n\t}\n\n\treturn art, err\n}\u003C\u002Fpre>\u003Cp>\u003Cstrong>构想二\u003C\u002Fstrong>，将Cache用于Controller层，甚至View层。\u003Cbr\u002F>\u003Cimg src=\"\u002F\u002Fduguying.oss-cn-qingdao.aliyuncs.com\u002F2014\u002F9\u002F23\u002Fcache_in_controller.png\" title=\"\" alt=\"cache_in_controller.png\"\u002F>\u003Cbr\u002F>若是将Cache用于Controller层，可以同时减轻业务逻辑处理和数据库查询。如果将Cache用于View层，甚至可以减轻模版的渲染工作，这样一来有点类似于全站静态化的感觉了，但是我并不觉得这是一个好方法，或许对于个别网站是可行的，但是对于大多数相对复杂的网站，这是完全不科学的方法。例如，一个论坛网站，某个页面有帖子正文，有回复，若是将这种页面放入Cache势必会导致不得不降低Cache过期时间，而最终的结果将会是Cache命中率极低，还不如不用Cache。\u003Cbr\u002F>\u003C\u002Fp>\u003Cp>对于我来说，我更偏向于在Model层使用Cache，因为这样会更加灵活能够定向的缓存该缓存的东西，而不是像方案二中外层的缓存使得数据块不易分离。\u003C\u002Fp>",{"title":19,"list":20},"最热文章",[21,27,33,39,45,51,57,63,69,75],{"id":22,"title":23,"uri":24,"author":9,"created_at":25,"view_count":26},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15573,{"id":28,"title":29,"uri":30,"author":9,"created_at":31,"view_count":32},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9253,{"id":34,"title":35,"uri":36,"author":9,"created_at":37,"view_count":38},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 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