270 lines
8.4 KiB
PHP
270 lines
8.4 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace mall;
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//数据导出模型
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class Backup{
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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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/**
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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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* @param string $type 执行类型，export - 备份数据， import - 还原数据
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*/
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public function __construct($file, $config, $type = 'export'){
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$this->file = $file;
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$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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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) + $size;
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}
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}
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/**
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* 写入初始数据
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* @return boolean true - 写入成功，false - 写入失败
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*/
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public function create(){
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$sql = "-- -----------------------------\n";
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$sql .= "-- Think MySQL Data Transfer \n";
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$sql .= "-- \n";
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$sql .= "-- Host : " . config('database.hostname') . "\n";
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$sql .= "-- Port : " . config('database.hostport') . "\n";
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$sql .= "-- Database : " . config('database.database') . "\n";
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$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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$sql .= "SET FOREIGN_KEY_CHECKS = 0;\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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$size = strlen($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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//备份表结构
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if(0 == $start){
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$result = Db::name($table)->query("SHOW CREATE TABLE `{$table}`");
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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 .= "DROP TABLE IF EXISTS `{$table}`;\n";
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$sql .= trim($result[0]['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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$result = Db::name($table)->query("SELECT COUNT(*) AS count FROM `{$table}`");
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$count = $result['0']['count'];
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//备份表数据
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if($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::name($table)->query("SELECT * FROM `{$table}` LIMIT {$start}, 1000");
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foreach ($result as $row) {
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$row = array_map('addslashes', $row);
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$sql = "INSERT INTO `{$table}` VALUES ('" . str_replace(array("\r","\n"),array('\r','\n'),implode("', '", $row)) . "');\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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//还有更多数据
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if($count > $start + 1000){
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return array($start + 1000, $count);
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}
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}
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//备份下一表
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return 0;
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}
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public function import($start){
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//还原数据
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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($sql))){
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if(false !== Db::name($start)->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($gz)) {
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return 0;
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}
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}
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return array($start, $size);
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}
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/**
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* 析构方法，用于关闭文件资源
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*/
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public function __destruct(){
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$this->config['compress'] ? @gzclose($this->fp) : @fclose($this->fp);
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}
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/**
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* 解析
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* @access public
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* @param mixed $filename
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* @return mixed
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*/
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public static function parseSql($filename){
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$lines=file($filename);
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$lines[0]=str_replace(chr(239).chr(187).chr(191),"",$lines[0]);//去除BOM头
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$flage = true;
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$sqls = array();
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$sql="";
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foreach($lines as $line)
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{
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$line=trim($line);
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$char=substr($line,0,1);
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if($char!='#' && strlen($line)>0)
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{
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$prefix=substr($line,0,2);
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switch($prefix)
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{
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case '/*':
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{
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$flage=(substr($line,-3)=='*/;'||substr($line,-2)=='*/')?true:false;
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break 1;
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}
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case '--': break 1;
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default :
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{
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if($flage)
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{
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$sql.=$line;
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if(substr($line,-1)==";")
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{
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$sqls[]=$sql;
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$sql="";
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}
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}
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if(!$flage)$flage=(substr($line,-3)=='*/;'||substr($line,-2)=='*/')?true:false;
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}
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}
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}
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}
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return $sqls;
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}
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/**
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* 安装
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* @access public
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* @param mixed $sqls
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* @return mixed
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*/
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public static function install($sqls){
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$flag = true;
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if(is_array($sqls))
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{
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foreach($sqls as $sql)
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{
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if(Db::name()->execute($sql) === false){ $flag = false;}
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}
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}
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return $flag;
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}
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}
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