242 lines
7.4 KiB
PHP
242 lines
7.4 KiB
PHP
<?php
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// +------------------------------------------------+
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// | http://www.cjango.com |
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// +------------------------------------------------+
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// | 修复BUG不是一朝一夕的事情，等我喝醉了再说吧！ |
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// +------------------------------------------------+
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// | Author: 小陈叔叔 <Jason.Chen> |
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// +------------------------------------------------+
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namespace tools;
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/**
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* 数据导出工具
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*/
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class Database
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{
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/**
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* 文件指针
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* @var resource
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*/
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private $fp;
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/**
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* 备份文件信息 part - 卷号，name - 文件名
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* @var array
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*/
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private $file;
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/**
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* 当前打开文件大小
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* @var integer
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*/
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private $size = 0;
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/**
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* 备份配置
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* @var integer
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*/
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private $config = [
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'path' => '', // 数据库备份根路径
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'part' => 2097152, // 数据库备份卷大小 2Mb
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'compress' => true, // 数据库备份文件是否启用压缩
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'level' => 9, // 数据库备份文件压缩级别
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'line' => 1000,
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];
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/**
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* 数据库备份构造方法
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* @param array $file 备份或还原的文件信息
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* @param array $config 备份配置信息
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*/
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public function __construct($file, $config)
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{
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$this->file = $file;
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$this->config = array_merge($this->config, $config);
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}
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/**
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* 打开一个卷，用于写入数据
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* @param integer $size 写入数据的大小
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*/
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private function open($size)
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{
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if ($this->fp) {
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$this->size += $size;
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if ($this->size > $this->config['part']) {
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$this->config['compress'] ? @gzclose($this->fp) : @fclose($this->fp);
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$this->fp = null;
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$this->file['part']++;
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session('backup_file', $this->file);
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$this->create();
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}
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} else {
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$backuppath = $this->config['path'];
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$filename = "{$backuppath}{$this->file['name']}-{$this->file['part']}.sql";
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if ($this->config['compress']) {
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$filename = "{$filename}.gz";
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$this->fp = @gzopen($filename, "a{$this->config['level']}");
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} else {
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$this->fp = @fopen($filename, 'a');
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}
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$this->size = filesize($filename) + $size;
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}
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}
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/**
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* 写入初始数据
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* @return boolean true - 写入成功，false - 写入失败
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*/
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public function create()
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{
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$sql = "-- -----------------------------\n";
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$sql .= "-- c.Jango MySQL Data Transfer\n";
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$sql .= "--\n";
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$sql .= "-- Host : " . \think\Config::get('database.hostname') . "\n";
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$sql .= "-- UserName : " . \think\Config::get('database.username') . "\n";
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$sql .= "-- Database : " . \think\Config::get('database.database') . "\n";
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$sql .= "--\n";
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$sql .= "-- Part : #{$this->file['part']}\n";
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$sql .= "-- Date : " . date("Y-m-d H:i:s") . "\n";
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$sql .= "-- -----------------------------\n\n";
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return $this->write($sql);
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}
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/**
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* 写入SQL语句
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* @param string $sql 要写入的SQL语句
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* @return boolean true - 写入成功，false - 写入失败！
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*/
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private function write($sql)
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{
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$size = strlen($sql);
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// 由于压缩原因，无法计算出压缩后的长度，这里假设压缩率为50%，
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// 一般情况压缩率都会高于50%；
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$size = $this->config['compress'] ? $size / 2 : $size;
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$this->open($size);
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return $this->config['compress'] ? @gzwrite($this->fp, $sql) : @fwrite($this->fp, $sql);
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}
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/**
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* 备份表结构
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* @param string $table 表名
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* @param integer $start 起始行数
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* @return boolean false - 备份失败
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*/
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public function backup($table, $start)
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{
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// 创建DB对象
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$db = \think\Loader::db();
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// 备份表结构
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if (0 == $start) {
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$result = $db->query("SHOW CREATE TABLE `{$table}`");
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$result = array_change_key_case($result[0]);
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$sql = "\n";
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$sql .= "-- -----------------------------\n";
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$sql .= "-- Table structure for `{$table}`\n";
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$sql .= "-- -----------------------------\n";
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$sql .= "SET FOREIGN_KEY_CHECKS = 0;\n";
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$sql .= "DROP TABLE IF EXISTS `{$table}`;\n";
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$sql .= trim($result['create table']) . ";\n\n";
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if (false === $this->write($sql)) {
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return false;
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}
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}
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// 数据总数
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$result = $db->query("SELECT COUNT(*) AS count FROM `{$table}`");
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$count = $result[0]['count'];
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$line = $this->config['line'];
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// 备份表数据
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if ($count) {
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// 写入数据注释
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if (0 == $start) {
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$sql = "-- -----------------------------\n";
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$sql .= "-- Records of `{$table}`\n";
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$sql .= "-- -----------------------------\n";
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$this->write($sql);
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}
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// 备份数据记录
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$result = $db->query("SELECT * FROM `{$table}` LIMIT {$start}, $line");
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$columns = $db->query("SHOW COLUMNS FROM `{$table}`");
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$columns = array_column($columns, 'Field');
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$columns = implode('`, `', $columns);
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$sql = "INSERT INTO `{$table}` (`{$columns}`) VALUES\r\n";
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foreach ($result as $row) {
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$sql .= "('" . str_replace(["\r", "\n"], ['\r', '\n'], implode("', '", $row)) . "'),\r\n";
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}
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$sql = rtrim(rtrim($sql), ',') . ";\r\n";
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if (false === $this->write($sql)) {
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return false;
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}
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// 还有更多数据
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if ($count > $start + $line) {
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return [$start + $line, $count];
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}
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}
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// 备份下一表
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return 0;
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}
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/**
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* 还原数据库
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* @param integer $start [description]
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* @return [type] [description]
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*/
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public function import($start = 0)
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{
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//还原数据
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$db = \think\Loader::db();
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if ($this->config['compress']) {
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$gz = gzopen($this->file[1], 'r');
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$size = 0;
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} else {
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$size = filesize($this->file[1]);
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$gz = fopen($this->file[1], 'r');
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}
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$sql = '';
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if ($start) {
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$this->config['compress'] ? gzseek($gz, $start) : fseek($gz, $start);
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}
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for ($i = 0; $i < 1000; $i++) {
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$sql .= $this->config['compress'] ? gzgets($gz) : fgets($gz);
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if (preg_match('/.*;$/', trim($sql))) {
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if (false !== $db->execute($sql)) {
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$start += strlen($sql);
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} else {
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return false;
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}
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$sql = '';
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} elseif ($this->config['compress'] ? gzeof($gz) : feof($gz)) {
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return 0;
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}
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}
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return [$start, $size];
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}
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/**
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* 析构方法，用于关闭文件资源
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*/
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public function __destruct()
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{
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if ($this->config['compress'] && !is_null($this->fp)) {
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@gzclose($this->fp);
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} elseif (!is_null($this->fp)) {
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@fclose($this->fp);
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} else {
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}
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}
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}
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