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Laravelの $builder->paginate() はクエリを2回走らせる

Last updated at Posted at 2017-07-05

コレクションの全体から総数を計算しているのかと思ったが、そんなことは無かった。
考えてみれば LIMIT .. OFFSET .. かけているから当然だった。

SQL発行回数が増えるので、Paginate対象が重いSQLだと注意。

以下証拠。

Route::get('test', function() {
    $interns = App\Models\User::paginate(30);
    throw new \Exception;
});

image

ちなみに軽量版である simplePaginate() でも同様。

Route::get('test', function() {
    $interns = App\Models\User::simplePaginate(30);
    throw new \Exception;
});
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