本文介绍了如何在 Laravel 中对自定义查询的结果进行分块的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我有一个自定义查询，它从旧系统中获取数据并将其映射到新系统中的模型.查询如下所示:
I have a custom query that grabs data from the old system and maps it to models in the new system. The query looks like this:
$companies = DB::connection('legacy')->select("...");
由于数据量很大，我想使用 Eloquent 的块功能(只是从他们的文档中复制的示例代码):
And since it's a lot of data, I'd like to use Eloquent's chunk feature (just sample code copied from their docs):
User::chunk(200, function($users)
{
foreach ($users as $user)
{
//
}
});
我该如何实施?
我的代码现在看起来像这样，导致没有响应:
My code now looks like this, which results in no response:
DB::connection('legacy')->select("SELECT * FROM companies")->chunk(200, function($companies) {
foreach ($companies as $company) {
// dd($company);
$entity = Entity::firstOrNew(['external_id' => $company->companyKey]);
$entity->name = $company->companyName;
$entity->save();
}
});
推荐答案
试试这个:
<?php
$max = 100;
$total = DB::connection('legacy')->select("...")->count();
$pages = ceil($total / $max);
for ($i = 1; $i < ($pages + 1); $i++) {
$offset = (($i - 1) * $max);
$start = ($offset == 0 ? 0 : ($offset + 1));
$legacy = DB::connection('legacy')->select("...")->skip($start)->take($max)->get();
/* Do stuff. */
}
基本上复制了 Laravel 的分页器所做的事情，而没有额外的开销.
Basically duplicates what Laravel's Paginator does without the extra overhead.
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