YII 技巧

大部分来源于  https://getyii.com/topic/47#comment24

获取当前Controller name和action name(在控制器里面使用)
echo $this->id;
echo $this->action->id;
控制器获取当前模块
$this->module->id

不生成label标签

// ActiveForm类
$form->field($model, '字段名')->passwordInput(['maxlength' => true])->label(false) ?>
Yii2 获取接口传过来的 JSON 数据:
Yii::$app->request->rawBody;
防止 SQL 和 Script 注入:
use yii\helpers\Html;
use yii\helpers\HtmlPurifier;

echo Html::encode($view_hello_str) //可以原样显示<script></script>代码
echo HtmlPurifier::process($view_hello_str)  //可以过滤掉<script></script>代码
大于、小于条件查询
// SELECT * FROM `order` WHERE `subtotal` > 200 ORDER BY `id`
$orders = $customer->getOrders()
->where(['>', 'subtotal', 200])
->orderBy('id')
->all();
搜索的时候添加条件筛选
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);
// $dataProvider->query->andWhere(['pid' => 0]);
$dataProvider->query->andWhere(['>', 'pid', 0]);
//可选传参
$dataProvider->query->andFilterWhere(['id'=>isset($id)?$id:null]);
有两种方式获取查询出来的 name 为数组的集合 [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();
打印数据:
// 引用命名空间
use yii\helpers\VarDumper;

// 使用
VarDumper::dump($var);

//  使用2  第二个参数是数组的深度  第三个参数是是否显示代码高亮(默认不显示)
VarDumper::dump($var, 10 ,true);die;
表单验证,只要需要一个参数:
public function rules()
{
    return [
        [['card_id', 'card_code'], function ($attribute, $param) {//至少要一个
            if (empty($this->card_code) && empty($this->card_id)) {
                $this->addError($attribute, 'card_id/card_code至少要填一个');
            }
        }, 'skipOnEmpty' => false],
    ];
}
SQL is not null条件查询
// ['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);
校验 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给必填项加星
div . required label:after {
    content:
    " *";
    color:
    red;
}
执行SQL查询并缓存结果
$styleId = Yii::$app->request->get('style');
$collection = Yii::$app->db->cache(function ($db) use ($styleId) {
    return Collection::findOne(['style_id' => $styleId]);
}, self::SECONDS_IN_MINITUE * 10);
场景:
数据库有user表有个avatar_path字段用来保存用户头像路径
需求: 头像url需要通过域名http://b.com/作为基本url
目标: 提高代码复用
此处http://b.com/可以做成一个配置
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) ? '可以设置一个默认的头像地址' : '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']; // 输出内容: http://b.com/头像路径
    }
}
Model 里面 rules 联合唯一规则
[['store_id', 'member_name'], 'unique', 'targetAttribute' => ['store_id', 'member_name'], 'message' => 'The combination of Store ID and Member Name has already been taken.'],

Model多个字段一条规则不同提示

[['name', 'email', 'subject', 'body'], 'required','message'=>'{attribute} 必须'],
标量查询
Post::find()->select('title')->where(['user_id' => $userId])->scalar();
生成 SQL:SELECT `title` FROM `post` WHERE `user_id` = 1
直接输出 title 的值。
如果 select('title') 不写的话,生成 SQL 是:`SELECT * FROM `post` WHERE `user_id`=1`
直接输出 id 的值
表单验证,去除首尾空格:
public function rules()
{
    return [[title', 'content'],'trim']];
}
单独为某个Action关闭 Csrf 验证
新建一个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;
        }
    }
}
然后在Controller中添加Behavior
public function behaviors()
{
    return [
        'csrf' => [
            'class' => NoCsrf::className(),
            'controller' => $this,
            'actions' => [
                'action - name'
            ]
        ]
    ];
}
LIKE 查询 单边加 %
['like', 'name', 'tester'] 会生成 name LIKE ' % tester % '。
['like', 'name', ' % tester', false] => name LIKE ' % tester'
$query = User::find()->where(['LIKE', 'name', $id . ' % ', false]);
SQL 随机抽取十名幸运用户
$query = new Query;
$query->select('ID, City,State,StudentName')
    ->from('student')
    ->where(['IsActive' => 1])
    ->andWhere(['not', ['State' => null]])
    ->orderBy(['rand()' => SORT_DESC])
    ->limit(10);
关于事务:
Yii::$app->db->transaction(function () {
    $order = new Order($customer);
    $order->save();
    $order->addItems($items);
});
// 这相当于下列冗长的代码:
$transaction = Yii::$app->db->beginTransaction();
try {
    $order = new Order($customer);
    $order->save();
    $order->addItems($items);
    $transaction->commit();
} catch (\Exception $e) {
    $transaction->rollBack();
    throw $e;
}
批量插入数据
第一种方法
$model = new User();
foreach ($data as $attributes) {
    $_model = clone $model;
    $_model->setAttributes($attributes);
    $_model->save();
}
第二种方法
$model = new User();
foreach ($data as $attributes) {
    $model->isNewRecord = true;
    $model->setAttributes($attributes);
    $model->save() && $model->id = 0;
}

URL操作

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::$app->request->url
或者
Yii::$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']
或者
Yii::$app->getRequest()->getReferrer()

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

posted @ 2017-12-28 17:57  雨落知音  阅读(388)  评论(0编辑  收藏  举报