YII 技巧

大部分來源於  https://getyii.com/topic/47#comment24php

獲取當前Controller name和action name(在控制器裏面使用)
echo $this->id;
echo $this->action->id;
控制器獲取當前模塊
$this->module->id

不生成label標籤web

// ActiveForm類
$form->field($model, '字段名')->passwordInput(['maxlength' => true])->label(false) ?>
Yii2 獲取接口傳過來的 JSON 數據:
Yii::$app->request->rawBody;
防止 SQL 和 Script 注入:
use yii\helpers\Html;
use yii\helpers\HtmlPurifier;

echo Html::encode($view_hello_str) //能夠原樣顯示<script></script>代碼
echo HtmlPurifier::process($view_hello_str)  //能夠過濾掉<script></script>代碼
大於、小於條件查詢
// SELECT * FROM `order` WHERE `subtotal` > 200 ORDER BY `id`
$orders = $customer->getOrders()
->where(['>', 'subtotal', 200])
->orderBy('id')
->all();
搜索的時候添加條件篩選
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
// $dataProvider->query->andWhere(['pid' => 0]);
$dataProvider->query->andWhere(['>', 'pid', 0]);
//可選傳參
$dataProvider->query->andFilterWhere(['id'=>isset($id)?$id:null]);
有兩種方式獲取查詢出來的 name 爲數組的集合 [name1, name2, name3]:
方式一:
return \yii\helpers\ArrayHelper::getColumn(User::find()->all(), 'name');
方式二:
return User::find()->select('name')->asArray()->column();
打印數據:
// 引用命名空間
use yii\helpers\VarDumper;

// 使用
VarDumper::dump($var);

//  使用2  第二個參數是數組的深度  第三個參數是是否顯示代碼高亮(默認不顯示)
VarDumper::dump($var, 10 ,true);die;
表單驗證,只要須要一個參數:
public function rules()
{
    return [
        [['card_id', 'card_code'], function ($attribute, $param) {//至少要一個
            if (empty($this->card_code) && empty($this->card_id)) {
                $this->addError($attribute, 'card_id/card_code至少要填一個');
            }
        }, 'skipOnEmpty' => false],
    ];
}
SQL is not null條件查詢
// ['not' => ['attribute' => null]]
//['ISNULL(`attribute`)'=>true]
$query = new Query; $query->select('ID, City,State,StudentName') ->from('student') ->where(['IsActive' => 1]) ->andWhere(['not', ['City' => null]]) ->andWhere(['not', ['State' => null]]) ->orderBy(['rand()' => SORT_DESC]) ->limit(10);
校驗 point_template_id 在 PointTemplate 是否存在
public function rules()
{
    return [
        [['point_template_id'], 'exist',
            'targetClass' => PointTemplate::className(),
            'targetAttribute' => 'id',
            'message' => '此{attribute}不存在。'
        ],
    ];
}
Yii給必填項加星
div . required label:after {
    content:
    " *";
    color:
    red;
}
執行SQL查詢並緩存結果
$styleId = Yii::$app->request->get('style');
$collection = Yii::$app->db->cache(function ($db) use ($styleId) {
    return Collection::findOne(['style_id' => $styleId]);
}, self::SECONDS_IN_MINITUE * 10);
場景:
數據庫有user表有個avatar_path字段用來保存用戶頭像路徑
需求: 頭像url須要經過域名http://b.com/做爲基本url
目標: 提升代碼複用
此處http://b.com/能夠作成一個配置
示例:
User.php
class User extends \yii\db\ActiveRecord
{
...
    public function extraFields()
    {
        $fields = parent::extraFields();

        $fields['avatar_url'] = function () {
            return empty($this->avatar_path) ? '能夠設置一個默認的頭像地址' : 'http://b.com/' . $this->avatar_path;
        };

        return $fields;
    }
...
}
ExampleController.php
class ExampleController extends \yii\web\Controller
{
    public function actionIndex()
    {
        $userModel = User::find()->one();
        $userData = $userModel->toArray([], ['avatar_url']);

        echo $userData['avatar_url']; // 輸出內容: http://b.com/頭像路徑
    }
}
Model 裏面 rules 聯合惟一規則
[['store_id', 'member_name'], 'unique', 'targetAttribute' => ['store_id', 'member_name'], 'message' => 'The combination of Store ID and Member Name has already been taken.'],

Model多個字段一條規則不一樣提示數據庫

[['name', 'email', 'subject', 'body'], 'required','message'=>'{attribute} 必須'],
標量查詢
Post::find()->select('title')->where(['user_id' => $userId])->scalar();
生成 SQL:SELECT `title` FROM `post` WHERE `user_id` = 1
直接輸出 title 的值。
若是 select('title') 不寫的話,生成 SQL 是:`SELECT * FROM `post` WHERE `user_id`=1`
直接輸出 id 的值
表單驗證,去除首尾空格:
public function rules()
{
    return [[title', 'content'],'trim']];
}
單獨爲某個Action關閉 Csrf 驗證
新建一個Behavior
use Yii;
use yii\base\Behavior;
use yii\web\Controller;

class NoCsrf extends Behavior
{
    public $actions = [];
    public $controller;

    public function events()
    {
        return [Controller::EVENT_BEFORE_ACTION => 'beforeAction'];
    }

    public function beforeAction($event)
    {
        $action = $event->action->id;
        if (in_array($action, $this->actions)) {
            $this->controller->enableCsrfValidation = false;
        }
    }
}
而後在Controller中添加Behavior
public function behaviors()
{
    return [
        'csrf' => [
            'class' => NoCsrf::className(),
            'controller' => $this,
            'actions' => [
                'action - name'
            ]
        ]
    ];
}
LIKE 查詢 單邊加 %
['like', 'name', 'tester'] 會生成 name LIKE ' % tester % '。
['like', 'name', ' % tester', false] => name LIKE ' % tester'
$query = User::find()->where(['LIKE', 'name', $id . ' % ', false]);
SQL 隨機抽取十名幸運用戶
$query = new Query;
$query->select('ID, City,State,StudentName')
    ->from('student')
    ->where(['IsActive' => 1])
    ->andWhere(['not', ['State' => null]])
    ->orderBy(['rand()' => SORT_DESC])
    ->limit(10);
關於事務:
Yii::$app->db->transaction(function () {
    $order = new Order($customer);
    $order->save();
    $order->addItems($items);
});
// 這至關於下列冗長的代碼:
$transaction = Yii::$app->db->beginTransaction();
try {
    $order = new Order($customer);
    $order->save();
    $order->addItems($items);
    $transaction->commit();
} catch (\Exception $e) {
    $transaction->rollBack();
    throw $e;
}
批量插入數據
第一種方法
$model = new User();
foreach ($data as $attributes) {
    $_model = clone $model;
    $_model->setAttributes($attributes);
    $_model->save();
}
第二種方法
$model = new User();
foreach ($data as $attributes) {
    $model->isNewRecord = true;
    $model->setAttributes($attributes);
    $model->save() && $model->id = 0;
}

URL操做數組

獲取url中的host信息
Yii::$app->request->getHostInfo()
獲取url中的路徑信息(不包含host和參數):
Yii::$app->request->getPathInfo()
獲取不包含host信息的url(含參數):
# /public/index.php?r=news&id=1
Yii::$app->request->url
或者
Yii::$app->request->requestUri
只想獲取url中的參數部分
# r=news&id=1
Yii::$app->getRequest()->queryString;
獲取某個參數的值,好比id
Yii::$app->getRequest()->getQuery('id'); //get parameter 'id'
獲取(除域名外的)首頁地址
# /public/index.php
Yii::$app->user->returnUrl;
獲取Referer
Yii::$app->request->headers['Referer']
或者
Yii::$app->getRequest()->getReferrer()
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