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<?php | |
/* | |
* This file is part of the Shieldon Simple Cache package. | |
* | |
* (c) Terry L. <contact@terryl.in> | |
* | |
* For the full copyright and license information, please view the LICENSE | |
* file that was distributed with this source code. | |
*/ | |
declare(strict_types=1); | |
namespace Shieldon\SimpleCache\Driver; | |
use PDO; | |
use function serialize; | |
use function unserialize; | |
/** | |
* A trait implements SQL-action methods. | |
*/ | |
Trait SqlTrait | |
{ | |
/** | |
* The PDO instance. | |
* | |
* @var PDO | |
*/ | |
protected $db; | |
/** | |
* Table name. | |
* | |
* @var string | |
*/ | |
protected $table = 'cache_data'; | |
/** | |
* Rebuid a database table schema for SQL-like Cache driver. | |
* | |
* @return bool True for success, overwise. | |
*/ | |
abstract public function rebuild(): bool; | |
/** | |
* Fetch a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return array | |
*/ | |
protected function doGet(string $key): array | |
{ | |
$sql = 'SELECT * FROM ' . $this->table . ' | |
WHERE cache_key = :cache_key'; | |
$query = $this->db->prepare($sql); | |
$query->bindValue(':cache_key', $key, PDO::PARAM_STR); | |
$query->execute(); | |
$resultData = $query->fetch($this->db::FETCH_ASSOC); | |
if (empty($resultData['cache_value'])) { | |
return []; | |
} | |
$data = unserialize($resultData['cache_value']); | |
return $data; | |
} | |
/** | |
* Set a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* @param mixed $value The value of a cache. (serialized) | |
* @param int $ttl The time to live for a cache. | |
* @param int $timestamp The time to store a cache. | |
* | |
* @return bool | |
*/ | |
protected function doSet(string $key, $value, int $ttl, int $timestamp): bool | |
{ | |
$cacheData = $this->get($key); | |
if (!empty($cacheData)) { | |
$sql = 'UPDATE ' . $this->table . ' | |
SET cache_value = :cache_value | |
WHERE cache_key = :cache_key'; | |
} else { | |
$sql = 'INSERT INTO ' . $this->table . ' (cache_key, cache_value) | |
VALUES (:cache_key, :cache_value)'; | |
} | |
$query = $this->db->prepare($sql); | |
$data = [ | |
'cache_key' => $key, | |
'cache_value' => serialize([ | |
'timestamp' => $timestamp, | |
'ttl' => $ttl, | |
'value' => $value | |
]), | |
]; | |
return $query->execute($data); | |
} | |
/** | |
* Delete a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return bool | |
*/ | |
protected function doDelete(string $key): bool | |
{ | |
$sql = 'DELETE FROM ' . $this->table . ' | |
WHERE cache_key = ?'; | |
$query = $this->db->prepare($sql); | |
$result = $query->execute([$key]); | |
return $result; | |
} | |
/** | |
* Delete all caches by an extended Cache Driver. | |
* | |
* @return bool | |
*/ | |
protected function doClear(): bool | |
{ | |
$sql = 'TRUNCATE TABLE ' . $this->table; | |
$query = $this->db->prepare($sql); | |
$result = $query->execute(); | |
return $result; | |
} | |
/** | |
* Check if the cache exists or not. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return bool | |
*/ | |
protected function doHas(string $key): bool | |
{ | |
$sql = 'SELECT COUNT(*) FROM ' . $this->table . ' | |
WHERE cache_key = :cache_key'; | |
$query = $this->db->prepare($sql); | |
$query->bindValue(':cache_key', $key, PDO::PARAM_STR); | |
$query->execute(); | |
$count =$query->fetchColumn(); | |
return $count > 0; | |
} | |
} |