Yii2.0+之开发笔记

雨点打透心脏的1/2处 2021-10-30 07:24 265阅读 0赞

1、AR模式去掉自动排序功能

public function search($params)
    {
    $dataProvider = new ActiveDataProvider([
        'query' => $query,
        'sort' => false,    // 去掉自动排序功能
    ]);

2、标量查询

Book模型对应的表为 book ，$bookId的参数值为1

Book::find()->select('title')->where(['id' => $bookId])->scalar();

生成 SQL：

SELECT `title` FROM `book` WHERE `id` = 1

直接输出 title 的值

如果 select('title') 不写的话，  
生成 SQL：

SELECT * FROM `book` WHERE `id`=1

直接输出 id 的值  
  
3、获取当前Controller name和action name和modules

modules模块下books

class BookController extends BaseController
    {
        public function actionIndex()
        {
            echo $this->id;
            echo "<pre>";
            echo $this->action->id;
            echo "<pre>";
            echo $this->module->id;//控制器获取当前模块 modules
            echo "<pre>";
        }
    }

直接输出：  
book  
index  
books

4、不生成label标签

// ActiveForm类
    $form->field($model, 'title')->textInput(['maxlength' => true])->label(false);

5、防止 SQL 和 Script 注入:

use yii\helpers\Html;
    use yii\helpers\HtmlPurifier;
    echo Html::encode($view); //可以原样显示<script></script>代码
    echo HtmlPurifier::process($view); //可以过滤掉<script></script>代码

6、AND、OR、大于、小于、不等于、等于、LIKE、IN 查询

$bookArr = Book::find()->select('title')
                ->where(['status'=>1])
                ->andWhere(['or',['type'=>2],['type'=>3]]) //OR
                //->where(['and', 'status=1', ['or', 'type=2', 'type=3']]) //AND、OR 等价于前2个条件组合
                ->andWhere(['status' => 1,'del_flag' => 0]) //等于
                ->andWhere(['<>','type',1]) //不等于
                ->andWhere(['>=', 'create_time', date('Y-m-d H:i:s', time())]) //大于等于
                ->andWhere(['<=', 'create_time', date('Y-m-d H:i:s', time())]) //小于等于
                ->andWhere(['like', 'title', '道德经']) //LIKE
                ->andWhere(['in', 'type', [1,2]]) //IN
                ->asArray()
                ->orderBy("id DESC")
                ->all();

7、有两种方式获取查询出来的 title 为数组的集合

方式一：

return \yii\helpers\ArrayHelper::getColumn(Book::find()->where(["category_id"=>1])->all(), 'title');

方式二：

return Book::find()->where(["category_id"=>1])->select('title')->asArray()->column();

8、搜索的时候添加条件筛选

$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
    // $dataProvider->query->andWhere(['cid' => 0]);
    $dataProvider->query->andWhere(['>', 'cid', 0]);
    //可选
    $dataProvider->query->andFilterWhere(['id'=>isset($bookId)?$bookId:null]);

9、表单验证去掉首尾空格

public function rules()
    {
      return [['title', 'content'],'trim']];
    }

10、LIKE 查询 单边加 %

['LIKE', 'title', '狼道'] 会生成 title LIKE '%狼道%'
    ['LIKE', 'title', '%狼道', false] => title LIKE '%狼道'
    ['LIKE', 'title', '狼道%', false] => title LIKE '狼道%'

11、事务等价变换

Yii::$app->db->transaction(function () {
      $bookOrder = new BookOrder();
      $bookOrder->save();
    });
    //等价于
    $transaction = Yii::$app->db->beginTransaction();
    try {
      $bookOrder = new BookOrder();
      $bookOrder->save();
      $transaction->commit();
    } catch (\Exception $e) {
      $transaction->rollBack();
      throw $e;
    }

12、批量插入数据

方式一：

$model = new Book();
    foreach ($data as $attributes) {
      $_model = clone $model;
      $_model->setAttributes($attributes);
      $_model->save();
    }

方式二：

$model = new Book();
    foreach ($data as $attributes) {
      $model->isNewRecord = true;
      $model->setAttributes($attributes);
      $model->save() && $model->id = 0;
    }

13、框架Model的save(false)使用

model类的RULES规则中，若对非数据表字段内容做了安全检查，一般调用model的save()方法时会报错，此时需要给save()方法增加参数false

$model = new Book();
    $model->title = '羊皮卷';
    $model->username = '王重阳';//假设book对应的数据表中不存在此字段
    $model->save(false);//若无false参数，则会保存失败

14、 DetailView小部件

DetailView 用来显示一条记录的详情，以下为一条记录的情况：  
1、一个Model模型类对象的数据  
2、ActiveRecord 类的一个实例对象  
3、由键值对构成的一个关联数组

DetailView::widget([         // 调用 DetailView::widget() 方法
            'model' => $model,           // model 这里可以是一个模型类的实例，也可以是一个数组
            'attributes' => [            // attributes 属性决定显示模型的那些属性以及如何格式化
                'id',
                [
                    'attribute' => 'uid',// 更常用的展示管理表字段的方式
                    'format' => 'raw',
                    'value' => \backend\modules\books\models\User::getUserName($model->uid)
                ],
                'title',
                'sort',
                'create_time',
                'update_time',
                [
                    'attribute' => 'del_flag',
                    'value' =>$model->del_flag==1?'已删除':'未删除',
                ],
            ],
            // 'template' 属性调整表格每一行的样式
            'template' => '<tr><th style="width: 120px;">{label}</th><td>{value}</td></tr>',
            //  'options' 属性调整真个 table 的样式
            'options' => ['class' => 'table table-striped table-bordered detail-view'],　　　     
        ])

User模型中方法getUserName

//获取用户姓名
    public static function getUserName($uid){
        if($uid>0){
            $username = User::find()->select("username")
                        ->where(['del_flag'=>0,'uid'=>$uid])
                        ->orderBy("id DESC")
                        ->scalar();
            return $username;
        }else{
            return "";
        }
    }

15、URL操作整理

//获取url中的host信息
    Yii::$app->request->getHostInfo();
        
    //获取url中的路径信息（不包含host和参数）：
    Yii::$app->request->getPathInfo();
    
    //获取不包含host信息的url（含参数）：
    # /public/index.php?r=news&id=1;
    Yii::$app->request->url;
    //或
    Yii::$app->request->requestUri;
    
    //只想获取url中的参数部分
    # r=news&id=1
    Yii::$app->getRequest()->queryString;
    
    //获取某个参数的值，比如id
    Yii::$app->getRequest()->getQuery('id'); //get parameter 'id'
        
    //获取（除域名外的）首页地址
    # /public/index.php
    Yii::$app->user->returnUrl;
    
    //获取Referer
    Yii::$app->request->headers['Referer'];
    //或
    Yii::$app->getRequest()->getReferrer();

16、GridView展示之批量排序功能

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25ldHVzZXIxOTM3_size_16_color_FFFFFF_t_70][]

<?php
    GridView::widget([
    'dataProvider' => $dataProvider,
    'columns' => [
    	['class' => 'yii\grid\SerialColumn','header'=>'编号'],
    	[
    		'attribute' => 'cover',
    		'format' => [
    			'image',//图片显示样式
    			[
    				'width'=>'100',
    				'height'=>'100'
    			]
    		],
    		'value' => function ($model) {
    		//图片URL地址 如：https://g.csdnimg.cn/static/user-reg-year/1x/3.png
    			return $model->cover;
    		}
    	],
    	[
    		'attribute' => 'title',
    		'label' => '标题',
    		'contentOptions' => [
    		'style' => 'white-space: normal;', 
    		'width' => '20%'
    		],
    	],
    	[
    		'attribute' => 'subtitle',
    		'label' => '副标题',
    		'contentOptions' => [
    		'style' => 'white-space: normal;', 
    		'width' => '20%'
    		],
    	],
    	[
    		'attribute' => 'is_try',
    		'label' => '书籍类型',
    		'value' => function ($model) {//标签设置样式
    			if($model->price == 0) {
    				$options = ['style' => ['color' => '#0000cc']];
    				return Html::tag('span','体验书籍',$options);
    			}else {
    				$options = ['style' => ['color' => '#A60000']];
    				return Html::tag('span','收费书籍',$options);
    			}
    		},
    		'format' => 'raw'
    	],
    	[
    		'label' => '排序',
    		'format' => 'raw',
    		'value' => function ($model) {//批量修改排序
    			return Html::textInput('sort[]',$model->sort, [
    				'class'=>'form-control form-input',
    				'id' => $model->id,
    				'value' => $model->sort,
    				'style' => 'width:60px'
    			]);
    		}
    	],
    	[
    			'attribute'=>'status',
    			'label'=>'状态',
    			'value'=>function($model) {
    				 return $model->status==1?'上架':'下架';
    			}
    	],
    	[
    		'class' => 'yii\grid\ActionColumn',
    		'header' => '操作',
    		'options' => ['width' => '100px;'],
    		'template' => '  {off} <br> {view}  {update}  {delete}',
    		'buttons' => [
    			'off' => function ($url, $model) {
    				$url = Yii::$app->request->url;
    				$action =  explode('/',$url);
    				if($model->status == 1) {
    					return Html::button(
    						'<i class="fa fa-remove">下架</i>', 
    						['id' => $model->id,'action'=>$action[3],
    						'class' => 'book del btn btn-warning btn-xs']
    					);
    				}else {
    					return Html::button(
    						'<i class="glyphicon glyphicon-ok">上架</i>',  
    						['id' => $model->id,'action'=>$action[3],
    						'class' => 'book del btn btn-warning btn-xs']
    					);
    				}
    			},
    			'view' => function ($url, $model) {
    				$url = Yii::$app->request->url;
    				$action =  explode('/',$url);
    				return Html::a(
    					'<i class="fa fa-edit">查看</i>', 
    					['book/view','id'=>$model->id,'action'=>$action[3]], 
    					[
    						'title' => Yii::t('app', 'view'),
    						'class' => 'del btn btn-primary btn-xs',
    					]
    				);
    			},
    			'update' => function ($url, $model) {
    				$url = Yii::$app->request->url;
    				$action =  explode('/',$url);
    				return Html::a(
    					'<i class="fa fa-unlock-alt">更新</i>', 
    					['book/update','id'=>$model->id,'action'=>$action[3]], 
    					[
    						'title' => Yii::t('app', 'update'),
    						'class' => 'del btn btn-success btn-xs',
    					]
    				);
    			},
    			'delete' => function ($url, $model) {
    				$url = Yii::$app->request->url;
    				$action =  explode('/',$url);
    				return Html::a(
    					'<i class="fa fa-close">删除</i>',  
    					['book/delete','id'=>$model->id,'action'=>$action[3]], 
    					[
    						'title' => Yii::t('app', 'delete'),
    						'class' => 'del btn btn-default btn-xs',
    						'data' => [
    							'confirm' => Yii::t(
    								'app', 
    								'Are you sure you want to delete this item?'
    							),
    							'method' => 'post',
    						],
    					]
    				);
    			},
    		],
    	],
    ],
    ]); 
    ?>
    <?=Html::button('更改排序',['class' => 'btn btn-info btn-sm batch-sort']) ?>

<?php
    namespace backend\modules\books\controllers;
    class BookController extends BaseController
    {
    	/**
         * 下架/下架
         */
        public function actionOff()
        {
        	if(Yii::$app->request->isPost) {
        		//检测是否登录
    			$user = Yii::$app->getUser();
    			if(!$user) {
    				return json_encode(['code' => 1,'msg' => '请先登录!'],256);
    			}
        		$post = Yii::$app->request->post();
    			$off = $this->findModel($post['id']);
    			if ($off->status == 1) {
    				$off->status = 0;
    				$off->off_shelf_time = date('Y-m-d H:s:i',time());
    			} else {
    				$off->status = 1;
    				$off->on_shelf_time = date('Y-m-d H:s:i',time());
    			}
    			$off->save();
    			return json_encode(['code' => 0,'msg' => '操作成功'],256);
    		}
        }
    	
    	/**
    	 * 批量更改排序
    	 */
    	public function actionBatchSort() {
    		if(Yii::$app->request->isPost){
    			$post = Yii::$app->request->post();
    			try {
    				foreach ($post as $key => $val) {
    					Book::updateAll(['sort' => $val],'id='.$key);
    				}
    				return json_encode(['code' => 0,'msg' => '操作成功']);
    			}catch (\Exception $e) {
    				var_dump($e->getMessage());
    			}
    		}
    	}
    	/**
    	  * 根据当前ID查询
    	  */
    	protected function findModel($id)
        {
            if (($model = Book::findOne($id)) !== null) {
                return $model;
            } else {
                throw new NotFoundHttpException('The requested does not exist.');
            }
        }
    }
    ?>

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