/**
* Reads data from this storage.
* Reading non-existent key will return null.
*
* @param string $key key to the data
*
* @returns mixed Data associated with the key
*
* @throws sfStorageException on failure
*/
public function read($key)
{
Preconditions::checkIsString($key);
if ($this->selectStatement === null) {
$this->selectStatement = $this->prepareSelect();
}
$statement = $this->selectStatement;
$statement->bindValue('key', $key);
if (!$statement->execute()) {
$info = $statement->errorInfo();
throw new sfStorageException("Problem reading key '{$key}' : " . $info[2]);
}
// Warning: do not use $statement->rowCount, as it may not return correct values on SELECTs
$result = $statement->fetchAll();
if (count($result) == 0) {
return null;
}
if (count($result) != 1) {
throw new sfStorageException("There are duplicate entries for key '{$key}'");
}
$data = $result[0][0];
return Serializer::deserialize($data);
}
private function serializeDeserialize($value)
{
return Serializer::deserialize(Serializer::serialize($value));
}
