README

This package provides a functionality that adds a chunkCursor to the Illuminate\Database\Eloquent\Builder class. This allows you to fetch large datasets in chunks using a cursor, reducing memory usage and use eager loading!

Why use that?

The eloquent method of the cursor builder does not support eager load relations, but with this package you will be able to use with() and load() as before with all the charms of cursor().

Installation

You can install the package via composer:

composer require itsimiro/laravel-chunk-cursor

Usage

Here's an example of how you can use the chunkCursor macro:

With cursor():

use App\Models\User;

User::query()->with(['articles', 'friends'])->cursor()->each(function (User $users) {
    // Process user... But 'articles' and 'friend' won't be loaded here :(
});

With chunkCursor():

use App\Models\User;

User::query()->with(['articles', 'friends'])->chunkCursor(50)->each(function (Collection $users) {
    foreach ($users as $user) {
        // Process user... With eager loading! :)
    }
});

In this example, the users are fetched in chunks of 50. You can adjust the chunk size to suit your needs.

Compare the execution time

Let's make a comparison without eager loading, and we'll see that chunkCursor is 2 times faster.

With cursor():

$startCursor = microtime(true);

DatabaseChunkCursorTestUser::query()->cursor()->each(function (DatabaseChunkCursorTestUser $user) use (&$i) {
    $this->assertEquals(true, true);
});

$endCursor = microtime(true);

$timeCursor = number_format($endCursor - $startCursor, 6); // 0.006624

With chunkCursor():

$startChunkCursor = microtime(true);

// 1000 rows
DatabaseChunkCursorTestUser::query()->chunkCursor(10)->each(function (Collection $users) use (&$i) {
    $i += 10;
    $this->assertLessThanOrEqual(10, $users->count());
});

$endChunkCursor = microtime(true);

$timeChunkCursor = number_format($endChunkCursor - $startChunkCursor, 6); // 0.003406

As you can see, if we add relationship loading, cursor will work even slower, because it will have to make a new request to the database every time to get data.

Testing

To run the tests for this package, use the following command:

composer test