/**
* Given the hash of a some data, check to see whether it exists in
* `tbl_cache`. If no cached object is found, this function will return
* false, otherwise the cached object will be returned as an array.
*
* @param string $hash
* The hash of the Cached object, as defined by the user
* @return array|boolean
* An associative array of the cached object including the creation time,
* expiry time, the hash and the data. If the object is not found, false will
* be returned.
*/
public function read($hash)
{
if ($c = $this->Database->fetchRow(0, "SELECT SQL_NO_CACHE * FROM `tbl_cache` WHERE `hash` = '{$hash}' AND (`expiry` IS NULL OR UNIX_TIMESTAMP() <= `expiry`) LIMIT 1")) {
if (!($c['data'] = Cacheable::decompressData($c['data']))) {
$this->delete($hash);
return false;
}
return $c;
}
$this->delete();
return false;
}
/**
* Given the hash of a some data, check to see whether it exists in
* `tbl_cache`. If no cached object is found, this function will return
* false, otherwise the cached object will be returned as an array.
*
* @param string $hash
* The hash of the Cached object, as defined by the user
* @param string $namespace
* The namespace allows a group of data to be retrieved at once
* @return array|boolean
* An associative array of the cached object including the creation time,
* expiry time, the hash and the data. If the object is not found, false will
* be returned.
*/
public function read($hash, $namespace = null)
{
$data = false;
// Check namespace first
if (!is_null($namespace)) {
$data = $this->Database->fetch("\n SELECT SQL_NO_CACHE *\n FROM `tbl_cache`\n WHERE `namespace` = '{$namepspace}'\n AND (`expiry` IS NULL OR UNIX_TIMESTAMP() <= `expiry`)\n ");
}
// Then check hash
if (!is_null($hash)) {
$data = $this->Database->fetchRow(0, "\n SELECT SQL_NO_CACHE *\n FROM `tbl_cache`\n WHERE `hash` = '{$hash}'\n AND (`expiry` IS NULL OR UNIX_TIMESTAMP() <= `expiry`)\n LIMIT 1\n ");
}
// If the data exists, see if it's still valid
if ($data) {
if (!($data['data'] = Cacheable::decompressData($data['data']))) {
$this->delete($hash, $namespace);
return false;
}
return $data;
}
$this->delete(null, $namespace);
return false;
}
