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