whereNull 相当于 is null whereNotNull相当于is not null 举个例子 这是数据库中的lara表 $res= DB::table('lara')->whereNull('uname')->get(); dd($res); 本条语句输出结果为 id=6的一条数据 也就是uname字段为空值的那条数据 $res= DB::table('lara')->whereNotNull('uname')->get(); ...
空值表示该列没有被赋值,而Null表示该列的值是未知的或不存在的。...在本文中,我们将讨论如何在MySQL中检查列是否为空或Null,并探讨不同的方法和案例。...SELECT * FROM users WHERE email ISNULL;这个查询将返回所有没有提供电子邮件地址的用户。...我们还提供了案例研究,展示了在不同情境下如何应用这些技巧...
$variable2 = null; $variable3 = 'value3'; $query = DB::table('table_name') ->where('column1', '=', $variable1) ->where(function ($query) use ($variable2) { if (!is_null($variable2)) { $query->where('column2', '=', $variable2); } }) ->where('column3', '=', $...
laravel中的whereNull和whereNotNull whereNull 相当于 is null whereNotNull相当于is not null 举个例⼦ 这是数据库中的lara表 $res = DB::table('lara')->whereNull('uname')->get();dd($res);本条语句输出结果为 id=6的⼀条数据也就是uname字段为空值的那条数据 $res = DB::table('lara')...
1) IS NULL = whereNull() 2) IS NOL NULL = whereNotNull() Where Null Query: SQL Query: SELECT * FROM users WHERE name IS NULL; Laravel Query: DB::table('users') ->whereNull('name') ->get(); Where Not Null Query: SQL Query: ...
I need to filter results that their presenter_id is null in pivot table(order_items). but there is no method like wherePivotNull . i also tried below solution(reference) but no chance : public function books() { return $this->morphedByMany('App\Models\Book', 'order_item') ->with...
($request->client && $request->search == null, function ($q) use ($request) { $q->whereHas('companies', function ($q) use ($request) { $q->where('is_client', true); });}) ->paginate(30)它与非客户联系人一起工作得很好,对于客户联系人初始列表看起来很好,但是当我们输入某些内容时,...
laravel 的collection功能非常强大并且易用,其中where是最常用的函数之一 先看一下官网的用法: $collection=collect([['product'=>'Desk','price'=>200],['product'=>'Chair','price'=>100],['product'=>'Bookcase','price'=>150],['product'=>'Door','price'=>100],]);$filtered=$collection->where...
Example controller whereAuth::user()is null: classArticleControllerextendsController{publicfunctionindex(Request$request){$user= \auth()->user();// null$user=Auth::user();// null$user=$request->user();// null} } In index method I know why the user is null since the route is not wra...
$builder->whereNull($model->getQualifiedDeletedAtColumn()); } /** * Remove the scope from the given Eloquent query builder. * * @param \Illuminate\Database\Eloquent\Builder $builder * @return void */ public function remove(Builder $builder) { $column = $builder->getModel()->getQualified...