AndySong

AndySong

Member Since 2 Years Ago

China

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Level 12
55,480 XP
Oct
15
1 month ago
Activity icon

Replied to Lazy Collections Working With DB

@jlrdw so, it's loading one by one, until you do not want it, whereas all is like gives you all at the same time,

is it correct?

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Replied to Lazy Collections Working With DB

ah, I see, sorry about that ,

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Replied to Lazy Collections Working With DB

@jlrdw where is this from? can u provide a link please?

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Replied to Lazy Collections Working With DB

@jlrdw I checked the docs before posting this thread, I understand how Lazy-collections works, but I do not know why there is no memory issue when using cursor method. Since it loads all the records into memory as well.

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Started a new Conversation Lazy Collections Working With DB

Route::get('/test', function () {

    $users = User::all();

    return 'done';
});

I understand that if I have many User records this code above would not work because of memory limit.

$users = User::cursor();

If I change it to cursor method, it's ok. As it's lazy and it will give records when I ask for it.

However, when it comes to DB query it still select * from 'users'.

Now, I am very confused,

  1. it seems like we still load all the records into memory, is it correct? but why this time memory is not a problem.

  2. Is it because $users = User::all(); this way it is in collection way in memory, whereas cursor is in another format? so it uses way less memory?

  3. Is it because Lazy Collection will stream data from DB? (I do not know how to express this properly, hopefully you can understand).

Any explanation is appreciated thanks !!!