...$result = Model::where(...)- get(); //不为空则if ($result- first()) { } if (!...$result- isEmpty()) { } if ($result- count()) { } $result = Model::where(...)- first();如果找不到数据,返回是null...以上这篇laravel判断查询数据库返回值的例子就是小编分享给大家的...
$model = Article::query(); if ($request->get('category_id')){ $model = $model->where('category_id',$request->get('category_id')); } if ($request->get('title')){ $model = $model->where('title','like','%'.$request->get('title').'%'); } $res = $model->orderBy('c...
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object(Illuminate\Support\Collection)对象实例。 其实,Eloquent 已经给我们封装几个判断方法如下: 代码语言:javascript 复制 $users=DB::table('users')-where('id',$id)-get();if($users-first()){//}if(!$users-isEmpty()){//}if...
这在你只需要一个结果时很有用。 $result=Model::where(...)->first();if($result){...} Notes / References ->first()http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_first ->isEmpty()http://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method...
那么问题来了,上述 $user 变量返回的其实是一个 QueryBuilder 对象,并不能获取到数据集。如果要获取数据集,需要调用Model类的 get 方法,或者使用 Eloquent Collection 集合类的 first 方法, 才能获取到数据对象模型,或集合。 那么如何对所得结果判空呢?
return$query->orWhere($field_name,'like','%'.$value); } /** time scopes */ publicfunctionscopeDateBetween($query,$field_name,$start_date=null,$end_date=null) { if(!empty($start_date)) { $query->where($field_name,'>=',$start_date.' 00:00:00'); ...
if(!empty($themeSaasTasks)) { returntrue; } } returnfalse; 2、现在需要查询出所有符合这个复杂的嵌套条件的记录,参考:https://learnku.com/docs/laravel/6.x/queries/5171#2f5914 ,代码实现如下 1 2 3 4 5 6 7 8 9 10 11 12 13 14
This is especially helpful if you have a collection of models and you want to load a relation for all of them. Because with eager loading you run only one additional DB query instead of one for every model in the collection.Example:
() 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...
('users','users.id','=','notes.user_id')->leftJoin('contacts','contacts.id','=','notes.contact_id')->orderBy($order[0], $order[1])->select(array('notes.*', DB::raw('notes.idasnid')));if(!empty($created_at_value)) $notes_query = $notes_query->wher...