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php数据库备份还原类分享

作者:佚名    责任编辑:admin    更新时间:2022-06-22

 这篇文章主要介绍了php数据库备份还原类,需要的朋友可以参考下

   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;   }   else   {    //备份全部表    $this->tables = $this->getTables();   }  }    /**   * 查询   * @param string $sql   * @return mixed   */  private function query($sql = '')  {   $stmt = $this->handler->query($sql);   $stmt->setFetchMode(PDO::FETCH_NUM);   $list = $stmt->fetchAll();   return $list;  }    /**   * 获取全部表   * @return array   */  private function getTables()  {   $sql = 'SHOW TABLES';   $list = $this->query($sql);   $tables = array();   foreach ($list as $value)   {    $tables[] = $value[0];   }   return $tables;  }    /**   * 获取表定义语句   * @param string $table   * @return mixed   */  private function getDDL($table = '')  {   $sql = "SHOW CREATE TABLE `{$table}`";   $ddl = $this->query($sql)[0][1] . ';';   return $ddl;  }    /**   * 获取表数据   * @param string $table   * @return mixed   */  private function getData($table = '')  {   $sql = "SHOW COLUMNS FROM `{$table}`";   $list = $this->query($sql);   //字段   $columns = '';   //需要返回的SQL   $query = '';   foreach ($list as $value)   {    $columns .= "`{$value[0]}`,";   }   $columns = substr($columns, 0, -1);   $data = $this->query("SELECT * FROM `{$table}`");   foreach ($data as $value)   {    $dataSql = '';    foreach ($value as $v)    {     $dataSql .= "'{$v}',";    }    $dataSql = substr($dataSql, 0, -1);    $query .= "INSERT INTO `{$table}` ({$columns}) VALUES ({$dataSql});rn";   }   return $query;  }    /**   * 写入文件   * @param array $tables   * @param array $ddl   * @param array $data   */  private function writeToFile($tables = array(), $ddl = array(), $data = array())  {   $str = "/*rnMySQL Database Backup Toolsrn";   $str .= "Server:{$this->config['host']}:{$this->config['port']}rn";   $str .= "Database:{$this->config['database']}rn";   $str .= "Data:" . date('Y-m-d H:i:s', time()) . "rn*/rn";   $str .= "SET FOREIGN_KEY_CHECKS=0;rn";   $i = 0;   foreach ($tables as $table)   {    $str .= "-- ----------------------------rn";    $str .= "-- Table structure for {$table}rn";    $str .= "-- ----------------------------rn";    $str .= "DROP TABLE IF EXISTS `{$table}`;rn";    $str .= $ddl[$i] . "rn";    $str .= "-- ----------------------------rn";    $str .= "-- Records of {$table}rn";    $str .= "-- ----------------------------rn";    $str .= $data[$i] . "rn";    $i++;   }   echo file_put_contents($this->config['target'], $str) ? '备份成功!花费时间' . (microtime(true) - $this->begin) . 'ms' : '备份失败!';  }    /**   * 错误信息   * @return mixed   */  public function getError()  {   return $this->error;  }    public function restore($path = '')  {   if (!file_exists($path))   {    $this->error('SQL文件不存在!');    return false;   }   else   {    $sql = $this->parseSQL($path);    try    {     $this->handler->exec($sql);     echo '还原成功!花费时间', (microtime(true) - $this->begin) . 'ms';    }    catch (PDOException $e)    {     $this->error = $e->getMessage();     return false;    }   }  }    /**   * 解析SQL文件为SQL语句数组   * @param string $path   * @return array|mixed|string   */  private function parseSQL($path = '')  {   $sql = file_get_contents($path);   $sql = explode("rn", $sql);   //先消除--注释   $sql = array_filter($sql, function ($data)   {    if (empty($data) || preg_match('/^--.*/', $data))    {     return false;    }    else    {     return true;    }   });   $sql = implode('', $sql);   //删除/**/注释   $sql = preg_replace('//*.**//', '', $sql);   return $sql;  } }