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<?php
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/****************************************************
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* NKeditor PHP
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* 本PHP程序是演示程序，建议不要直接在实际项目中使用。
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* 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。
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* **************************************************
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* 简易数据库, 单表 100w 条数据，查询一页数据在 0.015 秒左右
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* 缺陷，无法排序，如果要排序的话，那么不适合使用 SimpleDB， 请使用 mysql 或者 mongdb
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* User: yangjian
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* Date: 17-10-14
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* Time: 下午5:15
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*/
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class SimpleDB {
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/**
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* 文件资源
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* @var null|resource
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*/
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private $handler = null;
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/**
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* 初始化，打开文件
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* SimpleDB constructor.
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* @param $dbname
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*/
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public function __construct($dbname)
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{
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$dataDir = __DIR__."/data/";
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if (!file_exists($dataDir)) {
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mkdir($dataDir);
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}
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$this->handler = fopen($dataDir.$dbname.'.db', 'a+');
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}
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/**
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* 写入一行数据
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* @return bool
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*/
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public function putLine($data) {
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if ($this->handler != null) {
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fwrite($this->handler, $this->seralize($data));
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}
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return false;
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}
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/**
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* 分页获取数据列表
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* @param $key
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* @return array|null
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*/
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public function getDataList($page, $pagesize) {
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if($page <= 0) {
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$page = 1;
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}
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$offset = ($page - 1) * $pagesize;
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//循环读取数据
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$datas = [];
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$counter = 0;
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while (!feof($this->handler)) {
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if ($counter < $offset) {
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fgets($this->handler); //移动指针到下一行
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$counter++;
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continue;
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}
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if (count($datas) == $pagesize) {
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break;
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}
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$line = fgets($this->handler);
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if (!empty($line)) {
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$datas[] = $this->unseralize($line);
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}
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}
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return $datas;
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}
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/**
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* 序列化数据
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* @param $data
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* @return string
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*/
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private function seralize($data) {
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$break = "\n"; //换行符
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if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
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$break = "\r\n";
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}
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return json_encode($data, JSON_UNESCAPED_UNICODE).$break;
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}
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/**
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* 反序列化
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* @param $data
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* @return mixed
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*/
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private function unseralize($data) {
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return json_decode($data, true);
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}
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/**
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* 关闭文件
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*/
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public function __destruct()
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{
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if ($this->handler != null) {
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fclose($this->handler);
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}
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}
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} |
