mirror of
https://github.com/DesignPatternsPHP/DesignPatternsPHP.git
synced 2025-02-23 17:22:41 +01:00
126 lines
3.3 KiB
ReStructuredText
126 lines
3.3 KiB
ReStructuredText
`Entity-Attribute-Value (EAV)`__
|
||
================================
|
||
|
||
The Entity–attribute–value (EAV) pattern in order to implement EAV model with PHP.
|
||
|
||
Purpose
|
||
-------
|
||
|
||
The Entity–attribute–value (EAV) model is a data model to describe entities
|
||
where the number of attributes (properties, parameters) that can be used
|
||
to describe them is potentially vast, but the number that will actually apply
|
||
to a given entity is relatively modest.
|
||
|
||
Examples
|
||
--------
|
||
|
||
Check full work example in `example.php`_ file.
|
||
|
||
.. code-block:: php
|
||
|
||
use DesignPatterns\More\EAV\Entity;
|
||
use DesignPatterns\More\EAV\Attribute;
|
||
use DesignPatterns\More\EAV\Value;
|
||
|
||
// Create color attribute
|
||
$color = (new Attribute())->setName('Color');
|
||
// Create color values
|
||
$colorSilver = (new Value($color))->setName('Silver');
|
||
$colorGold = (new Value($color))->setName('Gold');
|
||
$colorSpaceGrey = (new Value($color))->setName('Space Grey');
|
||
|
||
// Create memory attribute
|
||
$memory = (new Attribute())->setName('Memory');
|
||
// Create memory values
|
||
$memory4Gb = (new Value($memory))->setName('4GB');
|
||
$memory8Gb = (new Value($memory))->setName('8GB');
|
||
$memory16Gb = (new Value($memory))->setName('16GB');
|
||
|
||
// Create storage attribute
|
||
$storage = (new Attribute())->setName('Storage');
|
||
// Create storage values
|
||
$storage128Gb = (new Value($storage))->setName('128GB');
|
||
$storage256Gb = (new Value($storage))->setName('256GB');
|
||
$storage512Gb = (new Value($storage))->setName('512GB');
|
||
$storage1Tb = (new Value($storage))->setName('1TB');
|
||
|
||
// Create entities with specific values
|
||
$mac = (new Entity())
|
||
->setName('MacBook')
|
||
// colors
|
||
->addValue($colorSilver)
|
||
->addValue($colorGold)
|
||
->addValue($colorSpaceGrey)
|
||
// memories
|
||
->addValue($memory8Gb)
|
||
// storages
|
||
->addValue($storage256Gb)
|
||
->addValue($storage512Gb)
|
||
;
|
||
|
||
$macAir = (new Entity())
|
||
->setName('MacBook Air')
|
||
// colors
|
||
->addValue($colorSilver)
|
||
// memories
|
||
->addValue($memory4Gb)
|
||
->addValue($memory8Gb)
|
||
// storages
|
||
->addValue($storage128Gb)
|
||
->addValue($storage256Gb)
|
||
->addValue($storage512Gb)
|
||
;
|
||
|
||
$macPro = (new Entity())
|
||
->setName('MacBook Pro')
|
||
// colors
|
||
->addValue($colorSilver)
|
||
// memories
|
||
->addValue($memory8Gb)
|
||
->addValue($memory16Gb)
|
||
// storages
|
||
->addValue($storage128Gb)
|
||
->addValue($storage256Gb)
|
||
->addValue($storage512Gb)
|
||
->addValue($storage1Tb)
|
||
;
|
||
|
||
|
||
UML Diagram
|
||
-----------
|
||
|
||
.. image:: uml/uml.png
|
||
:alt: EAV UML Diagram
|
||
:align: center
|
||
|
||
Code
|
||
----
|
||
|
||
You can also find these code on `GitHub`_
|
||
|
||
Test
|
||
----
|
||
|
||
Tests/EntityTest.php
|
||
|
||
.. literalinclude:: Tests/EntityTest.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
Tests/AttributeTest.php
|
||
|
||
.. literalinclude:: Tests/AttributeTest.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
Tests/ValueTest.php
|
||
|
||
.. literalinclude:: Tests/ValueTest.php
|
||
:language: php
|
||
:linenos:
|
||
|
||
|
||
.. _`example.php`: https://github.com/domnikl/DesignPatternsPHP/tree/master/More/EAV/example.php
|
||
.. _`GitHub`: https://github.com/domnikl/DesignPatternsPHP/tree/master/More/EAV
|
||
.. __: https://en.wikipedia.org/wiki/Entity–attribute–value_model
|