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<?php |
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/** |
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* Created by Gorlum 29.10.2016 10:16 |
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*/ |
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/** |
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* |
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* Persistent is extension of class cacher and can save itself to DB |
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* It's most usefull to hold basic structures as configuration, variables etc |
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* Persistent pretty smart to handle one-level tables structures a-la "variable_name"+"variable_value" |
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* Look supernova.sql to learn more |
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* Also this class can holds default values for variables |
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* |
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* @package supernova |
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* |
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*/ |
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class classPersistent extends classCache { |
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protected $table_name; |
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protected $sql_index_field; |
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protected $sql_value_field; |
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protected $defaults = array(); |
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/** |
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* @var bool $force |
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*/ |
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protected $force = false; |
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public function __construct($gamePrefix = 'sn_', $table_name = 'table') { |
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parent::__construct("{$gamePrefix}{$table_name}_"); |
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$this->table_name = $table_name; |
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$this->sql_index_field = "{$table_name}_name"; |
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$this->sql_value_field = "{$table_name}_value"; |
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if(!$this->_DB_LOADED) { |
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$this->db_loadAll(); |
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} |
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} |
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public static function getInstance($gamePrefix = 'sn_', $table_name = '') { |
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if (!isset(self::$cacheObject)) { |
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$className = get_class(); |
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self::$cacheObject = new $className($gamePrefix, $table_name); |
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} |
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return self::$cacheObject; |
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} |
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/** |
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* @param string $index |
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* |
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* @return string|null |
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*/ |
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public function db_loadItem($index) { |
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$result = null; |
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if($index) { |
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$index_safe = db_escape($index); |
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$queryResult = doquery("SELECT `{$this->sql_value_field}` FROM `{{{$this->table_name}}}` WHERE `{$this->sql_index_field}` = '{$index_safe}' FOR UPDATE", true); |
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if(is_array($queryResult) && !empty($queryResult)) { |
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$this->$index = $result = $queryResult[$this->sql_value_field]; |
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} |
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} |
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return $result; |
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} |
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public function db_loadAll() { |
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$this->loadDefaults(); |
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$query = doquery("SELECT * FROM {{{$this->table_name}}} FOR UPDATE;"); |
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while($row = db_fetch($query)) { |
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$this->$row[$this->sql_index_field] = $row[$this->sql_value_field]; |
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} |
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$this->_DB_LOADED = true; |
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} |
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public function loadDefaults() { |
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foreach($this->defaults as $defName => $defValue) { |
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$this->$defName = $defValue; |
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} |
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} |
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public function db_saveAll() { |
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$this->db_saveItem(array_combine(array_keys($this->defaults), array_fill(0, count($this->defaults), null))); |
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} |
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public function db_saveItem($item_list, $value = NULL) { |
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if(empty($item_list)) { |
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return; |
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} |
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!is_array($item_list) ? $item_list = array($item_list => $value) : false; |
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// Сначала записываем данные в базу - что бы поймать все блокировки |
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$qry = array(); |
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foreach($item_list as $item_name => $item_value) { |
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if($item_name) { |
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$item_value = db_escape($item_value === NULL ? $this->$item_name : $item_value); |
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$item_name = db_escape($item_name); |
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$qry[] = "('{$item_name}', '{$item_value}')"; |
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} |
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} |
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doquery("REPLACE INTO `{{" . $this->table_name . "}}` (`{$this->sql_index_field}`, `{$this->sql_value_field}`) VALUES " . implode(',', $qry) . ";"); |
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// И только после взятия блокировок - меняем значения в кэше |
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foreach($item_list as $item_name => $item_value) { |
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if($item_name && $item_value !== null) { |
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$this->__set($item_name, $item_value); |
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} |
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} |
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} |
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/** |
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* Instructs cache to pass next operation to DB - whether it read or write |
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* |
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* This allows more transparency when accessing variables. So |
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* $this->db_loadItem('variable_name') |
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* converts to |
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* $this->pass()->variable_name |
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* Latest makes IDE aware of operation with variables and makes navigation and code refactoring (i.e. variable renaming) much easier |
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* Same work with saving items directly to DB: |
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* $this->db_saveItem('variable_name', $value) |
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* becomes |
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* $this->pass()->variable_name = $value; |
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* |
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* @return $this |
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*/ |
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public function pass() { |
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$this->force = true; |
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return $this; |
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} |
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public function __get($name) { |
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if($this->force) { |
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$this->force = false; |
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$this->db_loadItem($name); |
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} |
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return parent::__get($name); |
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} |
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public function __set($name, $value) { |
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if($this->force) { |
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$this->force = false; |
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$this->db_saveItem($name, $value); |
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} |
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parent::__set($name, $value); |
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} |
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public function __unset($name) { |
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doquery("DELETE FROM `{{config}}` WHERE `config_name` = " .SN::$db->db_escape($name)); |
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parent::__unset($name); |
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} |
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} |
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supernova-ws /
SuperNova
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.