WhereNotExists是Laravel框架中的一个查询构造器方法,用于在数据库查询中检查关联表中不存在指定条件的记录。 具体来说,WhereNotExists方法可以用于在查询中排除那些在关联表中存在满足特定条件的记录的情况。它接受一个闭包函数作为参数,该闭包函数用于定义关联表的查询条件。
一般来讲有两种方式，而我们通常用的一种是从父模型使用关系写入，比如我们有一个 App\Thread 类，它...
Laravel whereNotHas 实现 /10/0/创建于5年前 Orm::where([])->whereNotExists(function($query){$query->select(\DB::raw(1))->from('has_table')->whereRaw('orm.id = has_table.id');})->first(); 举报 韩众 39 声望 PHP @ 未名
returnModel::query() ->whereNotExists(function($query){ // $query is a Query\Builder }) ->whereHas('relation',function($query){ // $query is an Eloquent\Builder }) ->with('relation',function($query){ // $query is an Eloquent\Relation }); 此功能...
$price = DB::table('orders') ->where('finalized', 1) ->avg('price');判断记录是否存在除了通过 count 方法可以确定查询条件的结果是否存在之外,还可以使用 exists 和doesntExist 方法:if (DB::table('orders')->where('finalized', 1)->exists()) { // ...}if (DB::table('orders')->...
laravel whereDoesntHave select * from `feeds` where not exists (select * from `black_lists` where `feeds`.`user_id` = `black_lists`.`target_id` and `user_id` = ?) FeedModel->whereDoesntHave('blacks',function($query)use($user) {$query->where('user_id',$user);...
laravel whereDoesntHave select * from `feeds` where not exists (select * from `black_lists` where `feeds`.`user_id` = `black_lists`.`target_id` and `user_id` = ?) FeedModel->whereDoesntHave('blacks',function($query)use($user) {$query->where('user_id',$user);...
WHERE NOT EXISTS( {.. sub query above here } ) 如果你想自己测试一下, 楷模:<?phpnamespace App\Models;use Illuminate\Database\Eloquent\Model; use Illuminate\Database\Eloquent\Relations\HasMany;class Post extends Model { public function comments(): HasMany ...
Laravel -WhereExists 返回“无效参数号:参数未定义” f7n*_*f7n 1 postgresql laravel eloquent whereExists()我正在尝试在现有的 Eloquent 查询生成器(称为)上使用$trips:$trips = $trips->whereExists(function ($query) use ($filterValue) { $query->from(DB::raw(...
The optional $where parameter of the on clause has been removed. To add a "where" conditions you should explicitly use one of the where methods offered by the query builder:$query->join('table', function ($join) { $join->on('foo', 'bar')->where('bar', 'baz'); });...