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<?php |
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namespace Kodus\Cache\Database; |
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use function implode; |
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use PDO; |
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use PDOException; |
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use PDOStatement; |
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abstract class Adapter |
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{ |
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/** |
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* @var PDO |
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*/ |
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private $pdo; |
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/** |
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* @var string |
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*/ |
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protected $table_name; |
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public function __construct(PDO $pdo, string $table_name) |
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{ |
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$this->pdo = $pdo; |
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$this->table_name = $table_name; |
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} |
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abstract public function select(string $key): ?CacheEntry; |
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abstract public function delete(string $key): void; |
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/** |
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* @param string[] $keys |
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* |
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* @return CacheEntry[] |
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*/ |
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abstract public function selectMultiple(array $keys): array; |
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abstract public function deleteMultiple(array $keys): void; |
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abstract public function upsert(array $values, int $expires): void; |
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abstract public function truncate(): void; |
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abstract public function deleteExpired(int $now): void; |
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abstract protected function createTable(): void; |
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protected function prepare(string $sql): PDOStatement |
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{ |
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return $this->pdo->prepare($sql); |
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} |
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/** |
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* @param PDOStatement $statement |
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* |
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* @return CacheEntry[] |
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*/ |
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protected function fetch(PDOStatement $statement): array |
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{ |
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$rows = $this->execute($statement)->fetchAll(PDO::FETCH_ASSOC); |
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$result = []; |
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foreach ($rows as $row) { |
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$result[] = new CacheEntry( |
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$row["key"], |
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is_resource($row["data"]) |
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? stream_get_contents($row["data"]) |
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: $row["data"], |
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$row["expires"]); |
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} |
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return $result; |
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} |
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protected function execute(PDOStatement $statement): PDOStatement |
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{ |
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try { |
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$this->unsafeExecute($statement); |
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} catch (PDOException $error) { |
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// TODO only retry if the error is a missing table error |
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$this->createTable(); |
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$this->unsafeExecute($statement); |
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} |
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return $statement; |
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} |
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protected function unsafeExecute(PDOStatement $statement): void |
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{ |
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if ($statement->execute() !== true) { |
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throw new PDOException(implode(" ", $statement->errorInfo())); |
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} |
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388 |
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} |
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} |
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kodus /
db-cache
