代码语言:txt 复制 use App\Models\User; // 检查 users 表是否为空 $isTableEmpty = User::count() === 0; if ($isTableEmpty) { echo "表是空的"; } else { echo "表不为空"; } 使用Query Builder 如果你不想使用 Eloquent ORM,也可以使用 Query Builder 来实现相同的功能。 代码语言:txt 复...
if(is_string($arguments[0])){returnapp('cache')->get(...$arguments);} 判断第一个位置参数,如果是字符串,那么推断用户就是要获取的键名。那就实例化Cache类并调用get方法获取缓存值。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if(!is_array($arguments[0])){thrownewException('When settin...
我对Laravel很陌生,尤其是在从数据库检索东西时。在阅读了他们关于query builder的文档后,我找到了一个部分,其中显示了执行我所需操作的示例代码: 如果不需要整行,可以使用value方法从记录中提取单个值。此方法将直接返回列的值: $email = DB::table('users')->where('name', 'John')->value('email'); 因...
Laravel's built-in validation rules each have an error message that is located in your application's lang/en/validation.php file. If your application does not have a lang directory, you may instruct Laravel to create it using the lang:publish Artisan command....
The findOrFail and firstOrFail methods will retrieve the first result of the query; however, if no result is found, a Illuminate\Database\Eloquent\ModelNotFoundException will be thrown:1$model = App\Flight::findOrFail(1); 2 3$model = App\Flight::where('legs', '>', 100)->first...
{if(!is_array($arr)) {return$query; }foreach($arras$key =>$value) { $query= $query->where($key, $value); }return$query; } 这样子,上面的语句就可以这么使用: Student::multiwhere([‘female’=>1, ’teacher_id’ =>4, ‘class_id’ =>3])->get(); ...
Tip: if you are using packages like spatie/eloquent-sortable to handle your Eloquent models sorting behaviour with a grouping query, you'll have to also set this grouping query in the table query instruction.Declare results on tablesTo display results, you'll have to return an array of ...
The captured referer is (from high to low priority): Theutm_sourcequery parameter, or: The domain from the request'sRefererheader if there's an external host in the URL, or: Empty An empty referer will never overwrite an exisiting referer. So if a visitor comes from google.com and visit...
() DB::connection('footprint')->beginTransaction(); //校验获取token的合法性 $appointmentInfo = AppointmentInfo::query()->selectRaw('id,userid,"inviteeUserid","prepareId",status,"isConsume"') ->where('id', $request->appointmentId)->lockForUpdate()->first(); if (empty($appointmentInfo...
This is due to using implicit route model binding in Laravel. Once in place, Laravel will help to inject the instance CEO into our methods and return a 404 status code if not found. This makes it very easy to use the instance of the model directly, without necessarily running a query ...