在使用LaravelEloquent 模型时,我们可能要判断取出的结果集是否为空,但我们发现直接使用 is_null 或 empty 是无法判段它结果集是否为空的。...var_dump 之后我们很容易发现,即使取到的空结果集, Eloquent 仍然会返回 Illuminate\Database\Eloquent\Collection 对象实例。...$result = Model::where(...)- get(...
例如,我们可以使用whereNotNull()方法来查询非空数据,或者使用whereNull()方法来查询空数据。这样可以根据具体需求来处理空数据的情况。 使用默认值:如果查询结果为空,我们可以使用默认值来替代空数据。在Laravel中,可以使用value()方法来获取查询结果的第一个值,并且可以指定一个默认值作为参数。这样,如果查询结果为...
默认情况下,Laravel 会在你的应用中的全局中间件栈中包含 TrimStrings 和ConvertEmptyStringsToNull 中间件。这些中间件在 App\Http\Kernel 类中。因此,如果您不希望验证程序将「null」值视为无效的,您通常需要将「可选」的请求字段标记为 nullable。$this->validate($request, [ 'title' => 'required|unique:...
Even if you are using straight Where and OrWhereNotNull condition then for every rows you will fetch both items ignoring other where conditions if applied. For example if you have more where conditions it will mask out those and still return with either null or value items because you used ...
6 Laravel Blade how to use if statement for null or empty 3 Laravel: How check if model field is nullable on database 1 check if value is null laravel 5 14 Laravel / Eloquent whereIn with null 1 Laravel return FALSE if field is NOT NULL (eloquent, whereNotNull) 2 If request...
The value is null. The value is an empty string. The value is an empty array or empty Countable object. The value is an uploaded file with no path.required_if:anotherfield,value,...The field under validation must be present and not empty if the anotherfield field is equal to any ...
->wherePivot('approved', 1); } } 在关系的另一端,我们想着获取一个team下所有成员的额外信息,假设是在后台页面上,我们想展示成员的审核状态,同时带上一个成员加入这个团队的时间信息。 我们就可以使用withPivot和withTimestamps方法来获取这些额外信息,但是我也可以使用using方法来声明一个类,用这个类来代表这块...
The field under validation must be present in the input data and not empty. A field is considered "empty" is one of the following conditions are true:The value is null. The value is an empty string. The value is an empty array or empty Countable object. The value is an uploaded file...
function autoGroupPromos(){ // removed for loop to clean outdated promos in single request // note that this way of deleting rows won't fire model events (if any) Promocode::whereNotNull('vk_user_id') ->where('created_at', '<=', Carbon::now()->subDay(1)) ->delete(); $permitt...
if (empty(request()->input('name'))) { $db = DB::table('class')->orderBy('id','desc')->paginate(1); }else{ //然后指下标 $search['name'] =request()->input('name'); $db = DB::table('class')->orderBy('id','desc')->where('name','like',"%".request()->input('nam...