https://github.com/xp-forge/aggregate

Aggregate data on lists
https://github.com/xp-forge/aggregate

aggregate n-plus-1 php7 php8 sql xp-framework

Last synced: about 1 month ago
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Aggregate data on lists

• Host: GitHub
• URL: https://github.com/xp-forge/aggregate
• Owner: xp-forge
• Created: 2019-08-11T13:19:55.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2024-03-24T10:19:09.000Z (9 months ago)
• Last Synced: 2024-10-13T13:20:52.766Z (2 months ago)
• Topics: aggregate, n-plus-1, php7, php8, sql, xp-framework
• Language: PHP
• Homepage:
• Size: 14.6 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: ChangeLog.md

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README

        
Aggregate data on lists

=======================

[![Build status on GitHub](https://github.com/xp-forge/aggregate/workflows/Tests/badge.svg)](https://github.com/xp-forge/aggregate/actions)

[![XP Framework Module](https://raw.githubusercontent.com/xp-framework/web/master/static/xp-framework-badge.png)](https://github.com/xp-framework/core)

[![BSD Licence](https://raw.githubusercontent.com/xp-framework/web/master/static/licence-bsd.png)](https://github.com/xp-framework/core/blob/master/LICENCE.md)

[![Requires PHP 7.0+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-7_0plus.svg)](http://php.net/)

[![Supports PHP 8.0+](https://raw.githubusercontent.com/xp-framework/web/master/static/php-8_0plus.svg)](http://php.net/)

[![Latest Stable Version](https://poser.pugx.org/xp-forge/aggregate/version.png)](https://packagist.org/packages/xp-forge/aggregate)

Circumvents [`n + 1`-problems](https://stackoverflow.com/questions/97197/what-is-the-n1-selects-problem-in-orm-object-relational-mapping) often occuring with SQL queries. 

Example

-------

The following shows how the *Aggregate* class works, firing only **two** SQL queries instead of creating an `n + 1`-problem.

```php

use util\data\Aggregate;

use rdbms\DriverManager;

$conn= DriverManager::getConnection($dsn);

$posts= Aggregate::of($conn->query('select * from post'))

  ->collect('comments', ['id' => 'post_id'], function($ids) use($conn) {

    return $conn->query('select * from comment where post_id in (%d)', $ids);

  })

  ->all()

;

// [

//   [

//     'id'       => 1,

//     'body'     => 'The first post',

//     'comments' => [

//        ['id' => 1, 'post_id' => 1, 'body' => 'Re #1: The first post'],

//        ['id' => 2, 'post_id' => 1, 'body' => 'Re #2: The first post'],

//     ]

//   ],

//   [

//     'id'       => 2,

//     'body'     => 'The second post',

//     'comments' => [

//        ['id' => 3, 'post_id' => 2, 'body' => 'Re #1: The second post'],

//     ]

//   ],

// ]

```