<?php
namespace queasy\db;
use ArrayAccess;
use InvalidArgumentException;
class Connection
{
const DEFAULT = 'sqlite::memory:';
const DEFAULT_DRIVER = 'sqlite';
const GENERIC_TEMPLATE = '%s:host=%s;port=%s;dbname=%s';
const SQLITE_TEMPLATE = 'sqlite:%s';
/**
* @var string Connection string.
*/
private $string;
/**
* Constructor.
*
* @param string|array|ArrayAccess $config String representing DSN, or array (or ArrayAccess instance) with database connection config options
*
* @throws DbException When $config doesn't represent a recognizable structure to build connection string
*/
public function __construct($config = null)
{
if (empty($config)) {
$this->string = static::DEFAULT;
return;
}
if (is_string($config)) {
$this->string = $config;
return;
}
if (is_array($config) || (is_object($config) && ($config instanceof ArrayAccess))) {
if (isset($config['dsn'])) {
$this->string = $config['dsn'];
return;
}
$this->string = isset($config['driver'])
? sprintf(
static::GENERIC_TEMPLATE,
$config['driver'],
isset($config['host'])? $config['host']: null,
isset($config['port'])? $config['port']: null,
isset($config['name'])? $config['name']: null)
: sprintf(
static::SQLITE_TEMPLATE,
isset($config['path'])
? $config['path']
: ':memory:');
return;
}
throw new InvalidArgumentException('Wrong config argument.');
}
/**
* Returns generated connection string.
*
* @return string Connection string
*/
public function get()
{
return $this->string;
}
/**
* Returns generated connection string when class instance is invoked as a function.
*
* @return string Connection string
*/
public function __invoke()
{
return $this->get();
}
}
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