83 lines
3.3 KiB
Markdown
83 lines
3.3 KiB
Markdown
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[](https://packagist.org/packages/cakephp/datasource)
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[](LICENSE.txt)
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# CakePHP Datasource Library
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This library contains interfaces for implementing Repositories and Entities using any data source,
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a class for managing connections to datasources and traits to help you quickly implement the
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interfaces provided by this package.
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## Repositories
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A repository is a class capable of interfacing with a data source using operations such as
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`find`, `save` and `delete` by using intermediate query objects for expressing commands to
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the data store and returning Entities as the single result unit of such system.
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In the case of a Relational database, a Repository would be a `Table`, which can be return single
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or multiple `Entity` objects by using a `Query`.
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This library exposes the following interfaces for creating a system that implements the
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repository pattern and is compatible with the CakePHP framework:
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* `RepositoryInterface` - Describes the methods for a base repository class.
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* `EntityInterface` - Describes the methods for a single result object.
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* `ResultSetInterface` - Represents the idea of a collection of Entities as a result of a query.
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Additionally, this package provides a few traits and classes you can use in your own implementations:
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* `EntityTrait` - Contains the default implementation for the `EntityInterface`.
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* `QueryTrait` - Exposes the methods for creating a query object capable of returning decoratable collections.
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* `ResultSetDecorator` - Decorates any traversable object, so it complies with `ResultSetInterface`.
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## Connections
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This library contains a couple of utility classes meant to create and manage
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connection objects. Connections are typically used in repositories for
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interfacing with the actual data source system.
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The `ConnectionManager` class acts as a registry to access database connections
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your application has. It provides a place that other objects can get references
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to existing connections. Creating connections with the `ConnectionManager` is
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easy:
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```php
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use Cake\Datasource\ConnectionManager;
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ConnectionManager::config('connection-one', [
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'className' => 'MyApp\Connections\CustomConnection',
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'param1' => 'value',
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'param2' => 'another value'
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]);
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ConnectionManager::config('connection-two', [
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'className' => 'MyApp\Connections\CustomConnection',
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'param1' => 'different value',
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'param2' => 'another value'
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]);
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```
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When requested, the `ConnectionManager` will instantiate
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`MyApp\Connections\CustomConnection` by passing `param1` and `param2` inside an
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array as the first argument of the constructor.
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Once configured connections can be fetched using `ConnectionManager::get()`.
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This method will construct and load a connection if it has not been built
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before, or return the existing known connection:
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```php
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use Cake\Datasource\ConnectionManager;
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$conn = ConnectionManager::get('master');
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```
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It is also possible to store connection objects by passing the instance directly to the manager:
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```php
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use Cake\Datasource\ConnectionManager;
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$conn = ConnectionManager::config('other', $connectionInstance);
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```
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## Documentation
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Please make sure you check the [official API documentation](https://api.cakephp.org/4.x/namespace-Cake.Datasource.html)
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