php实例之mysql数据备份

本代码实现了表结构和数据完全分开，默认有一个文件会记录所有表的结构，然后表中数据的备份 如果超过分卷的大小则会分成多个文件，不然则一个文件

备份:表结构和数据完全分开，默认有一个文件会记录所有表的结构，然后表中数据的备份 如果超过分卷的大小则会分成多个文件，不然则一个文件，参考了别人的代码，不过写的嘛，差强 人意，以后慢慢改吧。。。

代码如下：

<?php



/*

 * Created on 2014

 * Link for [email protected]

 * This is seocheck backup class

 */

class DbBackUp {

    private $conn;

    private $dbName;

    private $host;

    private $tag = '_b';

    //构造方法 链接数据库

    public function __construct($host='localhost', $dbUser='root', $dbPwd='', $dbName="seocheck", $charset='utf8') {

        @ob_start();

        @set_time_limit(0);

        $this->conn = mysql_connect($host, $dbUser, $dbPwd, true);

        if(!$this->conn) die("数据库系统连接失败！");

        mysql_query("set names ".$charset, $this->conn);

        mysql_select_db($dbName, $this->conn) or die("数据库连接失败！");

        $this->host = $host;

        $this->dbName = $dbName;

    }

 



    //获取数据库所有表名

    public function getTableNames () {

        $tables = array();

        $result = mysql_list_tables($this->dbName, $this->conn);

        if(!$result) die('MySQL Error: ' . mysql_error());

        while($row = mysql_fetch_row($result)) {

            $tables[] = $row[0];

        }

        return $tables;

    }



    //获取数据库表的字段信息

    public function getFieldsByTable ($table) {

        $fields = array();

        $str = '';

        $res = mysql_query("SHOW CREATE TABLE `{$table}`", $this->conn);

        if(!$res) die('MySQL Error: ' . mysql_error());

        while($rows = mysql_fetch_assoc($res)) {

            $str = str_replace("CREATE TABLE `{$table}` (", "", $rows['Create Table']);//DROP TABLE IF EXISTS `{$table}`\n

            $str = "--\n-- Table structure for table `{$table}`\n--\n\nCREATE TABLE IF NOT EXISTS `{$table}` ( ".$str;

            $str = str_replace(",", ", ", $str);

            $str = str_replace("`) ) ENGINE=InnoDB ", "`)\n ) ENGINE=InnoDB ", $str);

            $str .=";\n\n";

            //$str = $str.";\n\n--\n-- Dumping data for table `{$table}`\n--\n\n";

            $fields[$rows['Table']] = $str;

        }

        return $fields;

    } www.jbxue.com



    //获取表中的数据

    public function getDataByTable($table) {

        $data = array();

        $str = '';

        $res = mysql_query("SELECT * FROM `{$table}`", $this->conn);

        if(!$res) die('MySQL Error: ' . mysql_error());

        while($rows = mysql_fetch_assoc($res)) {

            if(!empty($rows)) {

                $data[] = $rows;

            }

        }

        $keys = array_keys($data[0]);

        foreach ($keys as $k=>$v) {

            $keys[$k] = '`'.$v.'`';

        }

        $key = join(', ', $keys);

        $str = "INSERT INTO `{$table}` ({$key}) VALUES\n";

        foreach ($data as $k=>$v) {

            $str.="(";

            while (list($key, $val) = each($v)) {

                if(!is_numeric($val)) {

                    $str.= "'".$val."', ";

                } else {

                    $str.= $val.', ';

                }

            }

            $str = substr($str, 0, -2);// 后边有空格 所以从-2 开始截取

            if($k+1 == count($data)) {

                $str.=");\n\n-- --------------------------------------------------------\n\n";

            } else {

                $str.="),\n";

            }

        }

        return $str;

    }



     //备份数据库

    public function getBackUpDataByTable ($tables, $path='', $fileName = 'seocheck', $subsection = '2') {

        if(empty($tables)) $this->_showMsg('未能指定要备份的表!!!', true);

        $page = 0;//卷数

        $path = empty($path) ? $_SERVER['DOCUMENT_ROOT'].'/core/Runtime/Data/'.$fileName.'Demo/' : $path;

        if(!file_exists($path)) {

            mkdir($path, 0777, true);

        } www.jbxue.com

        $mysql_info = $this->_retrieve();

        $fieldsByTable = array();

        if(is_array($tables)) {

            $this->_showMsg('开始备份,数据正在初始化中,请勿关闭浏览器...');

            $fw = $this->writeFileByBackUpData($path.$this->dbName.'_table.sql', $mysql_info, $method="ab+");

            if($fw !== false) {

                $this->_showMsg('备份数据库基本信息成功。。。');

            }

            foreach ($tables as $table) {

                $tableInfo = $this->getFieldsByTable($table);

                if(!empty($tableInfo)) {

                    $this->_showMsg('获取表['.$table.']结构成功。。。');

                    $fw = $this->writeFileByBackUpData($path.$this->dbName.'_table.sql', $tableInfo[$table], $method="ab+");

                    if($fw === false) {

                        $this->_showMsg('备份表['.$table.']结构失败。。。', true);

                    } else {

                        $this->_showMsg('备份表['.$table.']结构成功,开始获取数据。。。');

                    };

                } else {

                    $this->_showMsg('获取数据库['.$this->dbName.']表结构失败,请稍后再试！。。。', true);

                }

                $this->_insertSqlByTableForAll($path, $table, $subsection);

            }

        } else {

            $this->_showMsg('开始备份,数据正在初始化中,请勿关闭浏览器...');

            $tableInfo = $this->getFieldsByTable($tables);

            if(!empty($tableInfo)) {

                $this->_showMsg('获取表['.$tables.']结构成功。。。');

                $fw = $this->writeFileByBackUpData($path.$this->dbName.'_'.$tables.'_table.sql', $mysql_info.$tableInfo[$tables]);

                if($fw === false) {

                    $this->_showMsg('备份表['.$tables.']结构失败。。。', true);

                } else {

                    $this->_showMsg('备份表['.$tables.']结构成功,开始获取数据。。。');

                }

            } else {

                $this->_showMsg('获取表['.$tables.']结构失败,请稍后再试！。。。', true);

            }

            $res = $this->_insertSqlByTableForAll($path, $tables, $subsection);

        }

    }



    //数据库基本信息

    private function _retrieve() {

        $backUp  = '';

        $backUp .= '--' . "\n";

        $backUp .= '-- MySQL database dump' . "\n";

        $backUp .= '-- Created by DbBackUp class, Power By chujiu. ' . "\n";

        $backUp .= '--' . "\n";

        $backUp .= '-- 主机: ' . $this->host . "\n";

        $backUp .= '-- 生成日期: ' . date ( 'Y' ) . ' 年  ' . date ( 'm' ) . ' 月 ' . date ( 'd' ) . ' 日 ' . date ( 'H:i' ) . "\n";

        $backUp .= '-- MySQL版本: ' . mysql_get_server_info () . "\n";

        $backUp .= '-- PHP 版本: ' . phpversion () . "\n";

        $backUp .= "\n\n";

        $backUp .= "SET SQL_MODE='NO_AUTO_VALUE_ON_ZERO';\n";

        $backUp .= "SET time_zone = '+00:00';\n\n";

        $backUp .= "/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;\n";

        $backUp .= "/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;\n";

        $backUp .= "/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;\n";

        $backUp .= "/*!40101 SET NAMES utf8*/;\n\n";

        $backUp .= "--\n-- Database: `{$this->dbName}`\n--\n\n-- --------------------------------------------------------\n\n";

        return $backUp;

    }



    /**

     * 插入单条记录

     *

     * @param string $row

     */

    private function _insertSql($row, $table) {

        // sql字段逗号分割

        $insert = '';

        $insert .= "INSERT INTO `" . $table . "` VALUES(";

        foreach($row as $key=>$val) {

            $insert .= "'".$val."',";

        }

        $insert = substr($insert, 0 ,-1);

         $insert .= ");" . "\n";

        return $insert;

    }



    /**

     * 生成一个表的inser语句

     * @param string $table

     * @param string $subsection 分卷大小

     */

    private function _insertSqlByTableForAll($path, $table, $subsection) {

        $i = 0;

        $insertSqlByTable = '';

        $res = mysql_query("SELECT * FROM `{$table}`", $this->conn);

        if(!$res) die('MySQL Error: ' . mysql_error());

        while($rows = mysql_fetch_assoc($res)) {

            $insertSqlByTable .= $this->_insertSql($rows, $table);

            $size = strlen($insertSqlByTable);

            if($size > $subsection*1024*1024) {

                $fw = $this->writeFileByBackUpData($path.$table.$i.$this->tag.'.sql', $insertSqlByTable);

                if($fw === false) $this->_showMsg('数据库表['.$table.'],卷 '.$i.' 写入文件失败,请稍后再试！！！',true);

                $this->_showMsg('数据库表['.$table.'],卷 '.$i.' 备份成功！备份文件:[ '.$path.$table.$i.$this->tag.'.sql ]');

                $insertSqlByTable = '';

                $i+=1;

            }

        }

        // insertSqlByTable大小不够分卷大小

        if ($insertSqlByTable != "") {

            $fw = $this->writeFileByBackUpData($path.$table.$this->tag.'.sql', $insertSqlByTable);

            if($fw === false) $this->_showMsg('数据库表['.$table.']写入文件失败,请稍后再试！！！备份文件:[ '.$path.$table.$this->tag.'.sql ]',true);

            $this->_showMsg('数据库表['.$table.'] 备份成功！备份文件:[ '.$path.$table.$this->tag.'.sql ]');

        }

        $this->_showMsg('数据库表['.$table.']全部备份成功！');

    }



    // 写入文件

    public function writeFileByBackUpData($fileName, $data, $method="rb+", $iflock=1, $check=1, $chmod=1){

        $check && @strpos($fileName, '..')!==false && exit('Forbidden');

        @touch($fileName);

        $handle = @fopen($fileName, $method);

        if($iflock) {

            @flock($handle,LOCK_EX);

        }

        $fw = @fwrite($handle,$data);

        if($method == "rb+") ftruncate($handle, strlen($data));

        fclose($handle);

        $chmod && @chmod($fileName,0777);

        return $fw;

    }



    /**

     * path: 生成压缩包的路径

     * fileName : 要压缩的文件名 通常和path 同一目录

     */

    public function createZipByBackUpFile($path) {

        $db_base_files = $this->getFileByBackUpDir($path);

        if(!empty($db_base_files)) {

            $zip = new ZipArchive;

            if($zip->open($path.$this->dbName.date('Ymd').'.zip', ZipArchive::CREATE | ZIPARCHIVE::OVERWRITE) !== true) 

                die ("cannot open".$this->dbName.date('Ymd')."zip for writing.");

            foreach ($db_base_files as $key => $value) {

                if(is_file($value)) {

                    $file_name = basename($value);

                    $info[] = $zip->addFile($value, $file_name);// 避免压缩包里有文件的路径

                }

            }

            $zip->close();

            if(file_exists($path.$this->dbName.date('Ymd').'.zip'))

            foreach ($db_base_files as $val) {

                unlink($val);

            }

            if(count(array_filter($info)) > 0) return true;

        }

        return false;

    }



    //获取文件

    public function getFileByBackUpDir($path) {

        $info = array();

        $db_base_files = array();

        if( @file_exists($path) && is_dir($path) ) {

            if ($dh = opendir($path)) {

                while (($file = readdir($dh)) !== false) {

                    if($file != '.' && $file != '..') {

                        if( strripos($file, 'seocheck') !== false ) {

                            $db_base_files[] = $path.$file;

                        }

                    }

                }

                closedir($dh);

            }

        }

        return $db_base_files;

    }



    /**

     * @path: 生成压缩包的路径

     * @fileName : 要解压的文件名 默认解压到path 目录

     */

    public function uncompressZip($path, $zipName) {

        $path = empty($path) ? $_SERVER['DOCUMENT_ROOT'].'/core/Runtime/Data/' : $path;

        $zip = new ZipArchive;

        if ($zip->open($path.$zipName) === TRUE) {

            $zip->extractTo($path);

            $zip->close();

            return true;

        } else {

            return false;

        }

    }



    //导入数据库

    public function importingDataBySqlFile () {



    }



    //  及时输出信息

    private function _showMsg($msg,$err=false){

        if($err === true) {

            echo "<p style='font-size:14px;'><span style='color:red;'>ERROR: --- " . $msg . "</span></p>";exit;

        }

        echo "<p style='font-size:14px;'><span style='color:green;'>OK: --- " . $msg . "</span></p>";

    }



    // 锁定数据库，以免备份或导入时出错

    private function lock($table, $op = "WRITE") {

        if (mysql_query ( "lock tables " . $table . " " . $op ))

            return true;

        else

            return false;

    }



    // 解锁

    private function unlock() {

        if (mysql_query ( "unlock tables" ))

            return true;

        else

            return false;

    }



    // 析构

    public function __destruct() {

        if($this->conn){

            mysql_query ( "unlock tables", $this->conn );

            mysql_close ( $this->conn );

        }

    }

}

?>