yii2的 数据缓存-片段缓存-片段缓存-HTTP缓存

数据缓存：将一些 PHP 变量存储到缓存中，使用时再从缓存中取回。

如：页面中显示博客文章总数

片段缓存：缓存页面内容中的某个片段。

如：一个页面显示了逐年销售额的摘要表格，可以把表格缓存下来，以消除每次请求都要重新生成表格的耗时。

如：标签云，见如下代码

页面缓存：在服务器端缓存整个页面的内容。随后当同一个页面被请求时，内容将从缓存中取出，而不是重新生成。

HTTP缓存：利用客户端缓存去节省相同页面内容的生成和传输时间。

总结：

frontend/Controller/PostController.php

 ['class' => VerbFilter::className(),'actions' => ['delete' => ['POST'],],],'access' =>['class' => AccessControl::className(),'rules' =>[['actions' => ['index'],'allow' => true,'roles' => ['?'],],['actions' => ['index', 'detail'],'allow' => true,'roles' => ['@'],],],],'pageCache'=>['class'=>'yii\filters\PageCache','only'=>['index'],'duration'=>600,'variations'=>[Yii::$app->request->get('page'),Yii::$app->request->get('PostSearch'),],'dependency'=>['class'=>'yii\caching\DbDependency','sql'=>'select count(id) from post',],],'httpCache'=>['class'=>'yii\filters\HttpCache','only'=>['detail'],'lastModified'=>function ($action,$params){$q = new \yii\db\Query();return $q->from('post')->max('update_time');},'etagSeed'=>function ($action,$params) {$post = $this->findModel(Yii::$app->request->get('id'));return serialize([$post->title,$post->content]);},'cacheControlHeader' => 'public,max-age=600',],];}/*** Lists all Post models.* @return mixed*/public function actionIndex(){$tags=Tag::findTagWeights();$recentComments=Comment::findRecentComments();$searchModel = new PostSearch();$dataProvider = $searchModel->search(Yii::$app->request->queryParams);return $this->render('index', ['searchModel' => $searchModel,'dataProvider' => $dataProvider,'tags'=>$tags,'recentComments'=>$recentComments,]);}/*** Displays a single Post model.* @param integer $id* @return mixed*/public function actionView($id){return $this->render('view', ['model' => $this->findModel($id),]);}/*** Creates a new Post model.* If creation is successful, the browser will be redirected to the 'view' page.* @return mixed*/public function actionCreate(){$model = new Post();if ($model->load(Yii::$app->request->post()) && $model->save()) {return $this->redirect(['view', 'id' => $model->id]);} else {return $this->render('create', ['model' => $model,]);}}/*** Updates an existing Post model.* If update is successful, the browser will be redirected to the 'view' page.* @param integer $id* @return mixed*/public function actionUpdate($id){$model = $this->findModel($id);if ($model->load(Yii::$app->request->post()) && $model->save()) {return $this->redirect(['view', 'id' => $model->id]);} else {return $this->render('update', ['model' => $model,]);}}/*** Deletes an existing Post model.* If deletion is successful, the browser will be redirected to the 'index' page.* @param integer $id* @return mixed*/public function actionDelete($id){$this->findModel($id)->delete();return $this->redirect(['index']);}/*** Finds the Post model based on its primary key value.* If the model is not found, a 404 HTTP exception will be thrown.* @param integer $id* @return Post the loaded model* @throws NotFoundHttpException if the model cannot be found*/protected function findModel($id){if (($model = Post::findOne($id)) !== null) {return $model;} else {throw new NotFoundHttpException('The requested page does not exist.');}}public function actionDetail($id){//step1. 准备数据模型   	$model = $this->findModel($id);$tags=Tag::findTagWeights();$recentComments=Comment::findRecentComments();$userMe = User::findOne(Yii::$app->user->id);$commentModel = new Comment();$commentModel->email = $userMe->email;$commentModel->userid = $userMe->id;//step2. 当评论提交时，处理评论if($commentModel->load(Yii::$app->request->post())){$commentModel->status = 1; //新评论默认状态为 pending$commentModel->post_id = $id;if($commentModel->save()){$this->added=1;}}//step3.传数据给视图渲染return $this->render('detail',['model'=>$model,'tags'=>$tags,'recentComments'=>$recentComments,'commentModel'=>$commentModel, 'added'=>$this->added, 			]);}}

首页
文章列表
'postList','dataProvider'=>$dataProvider,'itemView'=>'_listitem',//子视图,显示一篇文章的标题等内容.'layout'=>'{items} {pager}','pager'=>['maxButtonCount'=>10,'nextPageLabel'=>Yii::t('app','下一页'),'prevPageLabel'=>Yii::t('app','上一页'),],])?>
 查找文章（cache->get('postCount');$dependency = new DbDependency(['sql'=>'select count(id) from post']);if ($data === false){$data = Post::find()->count();  sleep(5);Yii::$app->cache->set('postCount',$data,600,$dependency); //设置缓存60秒后过期}echo $data;*/?>count();?>）
				  
搜索
			
 标签云
'select count(id) from post']);if ($this->beginCache('cache',['duration'=>600],['dependency'=>$dependency])){echo TagsCloudWidget::widget(['tags'=>$tags]);$this->endCache();}*/?>$tags]);?>
			
 最新回复
$recentComments])?>
			

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 视频：http://www.yiichina.com/video

源代码下载：https://github.com/michaelweixi/blogdemo2/archive/V1.17.tar.gz

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