小编JKL*_*KLM的帖子

我想在Yii 2中实现以下SQL查询,但没有成功.

这应该给出唯一公司名称的总数:

SELECT count(DISTINCT(company_name)) FROM clients

这应该显示company_name为client code和id(PK):

SELECT (DISTINCT(company_name,client_code)) FROM clients

怎么做到这一点？

<div class="create-job-form">
    <?php
    Modal::begin([
        'header' => '<h4>Job Created</h4>',
        'id' => 'jobPop',
        'size' => 'modal-lg',
    ]);

    echo "<div id='modalContent'></div>";
    Modal::end();
    ?>
    <table width="5">
        <?php $form = ActiveForm::begin(); ?>


        <fieldset>
            <legend>Order Details</legend>
            <td>
                <tr> <?= Html::activeHiddenInput($model, 'job_code', ['value' => rand(1, 10000)]) ?> </tr>
            </td>
            <td>
                <tr><?= $form->field($model, 'job_description')->textInput(['maxlength' => true]) ?></tr>
            </td>
            <td>
                <tr>
                    <?= $form->field($model, 'approved_date')->widget(
                        DatePicker::className(), [
                        // inline too, not bad
                        'inline' => true,
                        // modify template for custom rendering
                        'template' => '{input}',
                        'clientOptions' => [
                            'autoclose' => false, …

PHP Notice 'yii\base\ErrorException' with message 'unserialize(): Error at offset 8189 of 8192 bytes' 

in C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2-debug\controllers\DefaultController.php:132

Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(8, 'unserialize(): ...', 'C:\\xampp\\htdocs...', 132, Array)
#1 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2-debug\controllers\DefaultController.php(132): unserialize('a:58:{s:13:"55a...')
#2 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2-debug\controllers\DefaultController.php(147): yii\debug\controllers\DefaultController->getManifest(false)
#3 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2-debug\controllers\DefaultController.php(92): yii\debug\controllers\DefaultController->loadData('55a8abf042085', 5)
#4 [internal function]: yii\debug\controllers\DefaultController->actionToolbar('55a8abf042085')
#5 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2\base\InlineAction.php(55): call_user_func_array(Array, Array)
#6 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2\base\Controller.php(151): yii\base\InlineAction->runWithParams(Array)
#7 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2\base\Module.php(455): yii\base\Controller->runAction('toolbar', Array)
#8 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2\web\Application.php(84): yii\base\Module->runAction('debug/default/t...', Array)
#9 C:\xampp\htdocs\final\advanced\vendor\yiisoft\yii2\base\Application.php(375): yii\web\Application->handleRequest(Object(yii\web\Request))
#10 C:\xampp\htdocs\final\advanced\backend\web\index.php(18): yii\base\Application->run()
#11 {main}

运行Yii2应用程序时出现此错误有什么问题吗？

创建新记录时，我需要用+ 1更新列值：

public function actionCreate()
    {
        $model = new CreateBookings();
        if ($model->load(Yii::$app->request->post())) {
            Yii::$app->db->createCommand("UPDATE room_types SET total_booked = total_booked + 1 WHERE room_type = '$model->room_type' ")->execute();
            $model->save();
            return $this->redirect(['view', 'id' => $model->id]);
            } else {
                 return $this->render('create', [
                 'model' => $model,
                 ]);
            }
    }

我在做什么错了，请指导:)

我对以下算法的时间复杂度感到困惑，它是 O(V) 还是 O(V+E)？

DFS(G,s,t):


vis[s] = true
        if s == t
            vis[s] = false, return 1
        cont = 0
        for v is adj(s)
            if vis[v] == false
                cont = cont + DFS(G,s,t)
        vis[s] = false
        return cont

我有一个服务可以获取令牌并保存在缓存中，我添加了如下所示的服务，但是当应用程序启动时它没有运行我需要做什么才能在启动时触发这个服务

public void ConfigureServices(IServiceCollection services)
 {
   services.AddScoped<ITokenService,TokenService>();
}

我需要设计一种算法，该算法将对仅包含数字-1,0,1的数组进行排序，而不使用任何临时变量或数组，并且仅使用交换，我想出了以下方法，我不确定是否是上）。

#include <stdio.h>
#define MAXSIZE 10

int main()
{
    int array[MAXSIZE];
    int i, j, num = 8, temp;

    int list[] = {-1,0,-1,0,1,1,0,1};

    int size = sizeof(list)/sizeof(list[0]);
    for (int i = 1; i < size; i++) {

        if (list[i] < list[i - 1]) {
            list[i] = list[i] + list[i - 1];
            list[i - 1] = list[i] - list[i - 1];
            list[i] = list[i] - list[i - 1];
            i = 0;
        }
    }

    printf("Sorted array is...\n");
    for (int i = 0; i …