- <?php
- /**
- * Sqlite缓存类
- */
- class Sqlite {
- static protected $handler;
- protected $options = array(
- 'table' => 'iCaches'
- );
- /**
- * 架构函数
- * @access public
- */
- public function __construct($options = array()) {
- $this->options['prefix'] = isset($options['prefix']) ? $options['prefix'] : C('DATA_CACHE_PREFIX', null, '');
- $this->options['expire'] = isset($options['expire']) ? $options['expire'] : C('DATA_CACHE_TIME', null, 36000);
- $this->options['nowTime'] = isset($GLOBALS['_beginTime']) ? $GLOBALS['_beginTime'] : microtime(true);
- $dbFile = TEMP_PATH . 'Caches.tmp';
- $isCreate = is_file($dbFile);
- if (empty(static::$handler)) {
- static::$handler = new PDO("sqlite:{$dbFile}", null, null, array(PDO::ATTR_PERSISTENT => true));
- empty($isCreate) && $this->exec("PRAGMA encoding = 'UTF8';PRAGMA temp_store = 2;PRAGMA auto_vacuum = 0;PRAGMA count_changes = 1;PRAGMA cache_size = 9000;");
- $this->chkTable() || $this->createTable();
- }
- }
- public function __destruct() {
- return $this->exec("DELETE FROM `{$this->options['table']}` WHERE `expire` < strftime('%s','now');VACUUM;");
- }
- public function __call($method, $arguments) {
- if (method_exists(self::$handler, $method)) {
- return call_user_func_array(array(self::$handler, $method), $arguments);
- } else {
- E(__CLASS__ . ':' . $method . L('_METHOD_NOT_EXIST_'));
- return;
- }
- }
- /**
- * 读取缓存
- * @access public
- * @param string $name 缓存变量名
- * @return mixed
- */
- public function get($name) {
- $id = $this->getName($name);
- $sth = static::$handler->query("SELECT `value` FROM `{$this->options['table']}` WHERE `id`='{$id}' AND `expire` > strftime('%s','now') LIMIT 1", PDO::FETCH_NUM);
- if (!empty($sth)) {
- N('cache_read', 1);
- list($data) = $sth->fetch();
- return unserialize($data);
- } else {
- return false;
- }
- }
- /**
- * 写入缓存
- * @access public
- * @param string $name 缓存变量名
- * @param mixed $value 存储数据
- * @param int $expire 有效时间 0为永久
- * @return boolean
- */
- public function set($name, $value, $expire = 0) {
- N('cache_write', 1);
- $data = serialize($value);
- if ($expire < 0 || $expire === false) {
- return true;
- } elseif (is_null($value) || $value === false) {
- return $this->rm($name);
- } elseif ($expire < 1) {
- $expire = 315360000;
- }
- $id = $this->getName($name);
- return $this->exec("REPLACE INTO `{$this->options['table']}` VALUES('{$id}','{$data}',{$expire}+strftime('%s','now'))");
- }
- /**
- * 删除缓存
- * @access public
- * @param string $name 缓存变量名
- * @return boolean
- */
- public function rm($name) {
- $id = $this->getName($name);
- return $this->exec("DELETE FROM `{$this->options['table']}` WHERE `id` = '{$id}'");
- }
- /**
- * 清除缓存
- * @access public
- * @param string $name 缓存变量名
- * @return boolean
- */
- public function clear() {
- return $this->exec("DELETE FROM `{$this->options['table']}`;");
- }
- /**
- * 检查当前表是否存在
- * @return bool 返回检查结果,存在返回True,失败返回False
- */
- protected function chkTable() {
- return in_array($this->options['table'], $this->getTables());
- }
- /**
- * 获取当前数据库的数据表列表
- * @return array 返回获取到的数据表列表数组
- */
- protected function getTables() {
- $tables = $data = array();
- $sth = $this->query("SELECT `name` FROM `sqlite_master` WHERE `type` = 'table' UNION ALL SELECT `name` FROM `sqlite_temp_master`");
- if (!empty($sth)) {
- while ($row = $sth->fetch(PDO::FETCH_NUM, PDO::FETCH_ORI_NEXT)) {
- $tables[] = $row[0];
- }
- unset($sth, $row);
- }
- return $tables;
- }
- /**
- * 创建当前数据表
- * @return integer 成功返回1,失败返回0
- */
- protected function createTable() {
- return $this->exec("CREATE TABLE IF NOT EXISTS `{$this->options['table']}` (`id` VARCHAR PRIMARY KEY ON CONFLICT FAIL NOT NULL COLLATE 'NOCASE',`value` TEXT NOT NULL,`expire` INTEGER NOT NULL);");
- }
- /**
- * 获取缓存名称
- * @param string $name
- * @return string
- */
- protected function getName($name) {
- if (!is_string($name) && !is_numeric($name)) {
- $name = md5(serialize($name));
- }
- return $this->options['prefix'] . $name;
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/3004201512462.html
来源: http://www.codesnippet.cn/detail/3004201512462.html