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<?php
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// +----------------------------------------------------------------------
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// | 海豚PHP框架 [ DolphinPHP ]
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// +----------------------------------------------------------------------
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// | 版权所有 2016~2017 河源市卓锐科技有限公司 [ http://www.zrthink.com ]
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// +----------------------------------------------------------------------
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// | 官方网站: http://dolphinphp.com
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// +----------------------------------------------------------------------
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// | 开源协议 ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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namespace util;
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use think\Db;
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/**
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* 导出数据表到文件
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* @author 麦当苗儿 <zuojiazi@vip.qq.com>
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* @alter CaiWeiMing <314013107@qq.com>
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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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/**
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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 = 0){
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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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$backup_path = $this->config['path'];
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$filename = "{$backup_path}{$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) + $size;
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}
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}
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/**
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* 写入初始数据
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* @return mixed
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*/
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public function create(){
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$sql = "-- -----------------------------\n";
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$sql .= "-- MySQL Data Transfer\n";
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$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 $sql 要写入的SQL语句
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* @return int
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*/
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private function write($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 $start 起始行数
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* @return array|bool|int false - 备份失败
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*/
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public function backup($table = '', $start = 0){
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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_map('array_change_key_case', $result);
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$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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$result = Db::query("SELECT COUNT(*) AS count FROM `{$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::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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/**
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* 导入数据
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* @param integer $start 起始位置
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* @return array|bool|int
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*/
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public function import($start = 0){
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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 array($start, $size);
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}
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/**
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* 导出
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* @param array $tables 表名
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* @param string $path 导出路径
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* @param string $prefix 表前缀
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* @param integer $export_data 是否导出数据
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* @author 蔡伟明 <314013107@qq.com>
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* @return bool
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*/
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public static function export($tables = [], $path = '', $prefix = '', $export_data = 1){
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$tables = is_array($tables) ? $tables : explode(',', $tables);
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$datetime = date('Y-m-d H:i:s', time());
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$sql = "-- -----------------------------\n";
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$sql .= "-- 导出时间 `{$datetime}`\n";
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$sql .= "-- -----------------------------\n";
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if (!empty($tables)) {
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foreach ($tables as $table) {
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$sql .= self::getSql($prefix.$table, $export_data);
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}
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// 写入文件
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if (file_put_contents($path, $sql)) {
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return true;
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};
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}
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return false;
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}
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/**
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* 导出卸载文件
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* @param array $tables 表名
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* @param string $path 导出路径
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* @param string $prefix 表前缀
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* @author 蔡伟明 <314013107@qq.com>
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* @return bool
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*/
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public static function exportUninstall($tables = [], $path = '', $prefix = ''){
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$tables = is_array($tables) ? $tables : explode(',', $tables);
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$datetime = date('Y-m-d H:i:s', time());
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$sql = "-- -----------------------------\n";
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$sql .= "-- 导出时间 `{$datetime}`\n";
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$sql .= "-- -----------------------------\n";
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if (!empty($tables)) {
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foreach ($tables as $table) {
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$sql .= "DROP TABLE IF EXISTS `{$prefix}{$table}`;\n";
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}
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// 写入文件
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if (file_put_contents($path, $sql)) {
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return true;
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};
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}
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return false;
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}
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/**
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* 获取表结构和数据
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* @param string $table 表名
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* @param integer $export_data 是否导出数据
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* @param integer $start 起始行数
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* @author 蔡伟明 <314013107@qq.com>
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* @return string
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*/
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private static function getSql($table = '', $export_data = 0, $start = 0)
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{
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$sql = "";
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if (Db::query("SHOW TABLES LIKE '%{$table}%'")) {
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// 表结构
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if ($start == 0) {
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$result = Db::query("SHOW CREATE TABLE `{$table}`");
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$sql .= "\n-- -----------------------------\n";
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$sql .= "-- 表结构 `{$table}`\n";
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$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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}
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// 表数据
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if ($export_data) {
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$sql .= "-- -----------------------------\n";
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$sql .= "-- 表数据 `{$table}`\n";
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$sql .= "-- -----------------------------\n";
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// 数据总数
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$result = Db::query("SELECT COUNT(*) AS count FROM `{$table}`");
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$count = $result['0']['count'];
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// 备份数据记录
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$result = Db::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("', '", $row)) . "');\n";
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}
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// 还有更多数据
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if($count > $start + 1000){
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$sql .= self::getSql($table, $export_data, $start + 1000);
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}
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}
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}
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return $sql;
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}
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/**
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* 析构方法，用于关闭文件资源
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*/
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public function __destruct(){
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$this->config['compress'] ? @gzclose($this->fp) : @fclose($this->fp);
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}
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} |