php数据库备份还原类分享

代码如下:
<?php
/**
 * 数据库备份还原类
 * @author xialeistudio<admin@xialeistudio.net>
 * Class DatabaseTool
 */
class DatabaseTool
{
 private $handler;
 private $config = array(
  'host' => 'localhost',
  'port' => 3306,
  'user' => 'root',
  'password' => '',
  'database' => 'test',
  'charset' => 'utf-8',
  'target' => 'sql.sql'
 );
 private $tables = array();
 private $error;
 private $begin; //开始时间
 /**
  * 架构方法
  * @param array $config
  */
 public function __construct($config = array())
 {
  $this->begin = microtime(true);
  $config = is_array($config) ? $config : array();
  $this->config = array_merge($this->config, $config);
  //启动PDO连接
  if (!$this->handler instanceof PDO)
  {
   try
   {
    $this->handler = new PDO("mysql:host={$this->config['host']}:{$this->config['port']};dbname={$this->config['database']}", $this->config['user'], $this->config['password']);
   }
   catch (PDOException $e)
   {
    $this->error = $e->getMessage();
    return false;
   }
   catch (Exception $e)
   {
    $this->error = $e->getMessage();
    return false;
   }
  }
 }

 /**
  * 备份
  * @param array $tables
  * @return bool
  */
 public function backup($tables = array())
 {
  //存储表定义语句的数组
  $ddl = array();
  //存储数据的数组
  $data = array();
  $this->setTables($tables);
  if (!empty($this->tables))
  {
   foreach ($this->tables as $table)
   {
    $ddl[] = $this->getDDL($table);
    $data[] = $this->getData($table);
   }
   //开始写入
   $this->writeToFile($this->tables, $ddl, $data);
  }
  else
  {
   $this->error = '数据库中没有表!';
   return false;
  }
 }

 /**
  * 设置要备份的表
  * @param array $tables
  */
 private function setTables($tables = array())
 {
  if (!empty($tables) && is_array($tables))
  {
   //备份指定表
   $this->tables = $tables;
  }