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 $res= DB::table('lara')->whereNotNull('uname')->get(); ...
空值表示该列没有被赋值,而Null表示该列的值是未知的或不存在的。...在本文中,我们将讨论如何在MySQL中检查列是否为空或Null,并探讨不同的方法和案例。...SELECT * FROM users WHERE email ISNULL;这个查询将返回所有没有提供电子邮件地址的用户。...我们还提供了案例研究,展示了在不同情境下如何应用这些技巧...
在使用LaravelEloquent 模型时,我们可能要判断取出的结果集是否为空,但我们发现直接使用 is_null 或 empty 是无法判段它结果集是否为空的。...var_dump 之后我们很容易发现,即使取到的空结果集, Eloquent 仍然会返回 Illuminate\Database\Eloquent\Collection 对象实例。...$result = Model::where(...)- get(...
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')...
Use whereNull $shipment_data = DB::table('shipment') ->whereNull('pdf_url')->get(); Share Follow answered Dec 12, 2017 at 2:05 sumit 15.4k1313 gold badges7171 silver badges112112 bronze badges Add a comment 4 try this: $records = DB::table('shipment') ->where('shipment...
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: ...
$users=DB::table('users')->where('id',$id)->get();if($users){//有数据}else{//没数据}或if(is_null($users)){//}或if(empty($users)){//} 以上方法都是不行的,在使用 Laravel Eloquent 模型时,我们要判断取出的结果集是否为空,但我们发现直接使用 is_null 或 empty是无法判段它结果集是...
Laravel: WhereNull, OrWhere, is ignoring WhereRaw Ask Question Asked 7 years, 4 months ago Modified 7 years, 4 months ago Viewed 2k times Part of PHP Collective Report this ad0 In my controller I am using Laravels WhereNull, OrWhere and WhereRaw in DB Query. It is pulling in all...
()}=null;// 修改处,还原正常$this->deleted_status=0;// Once we have saved the model, we will fire the "restored" event so this// developer will do anything they need to after a restore operation is// totally finished. Then we will return the result of the save call.$this->exists...
Laravel Version: 5.8 / 6.x PHP Version: 7.2.0 Database Driver & Version: MySQL 5.7 (not sure about other dbs) Description: The whereNull('a->b') will generate json_unquote(json_extract(`a`, '$."b"')) is null that doesn't work as expected...