php实现MySQL数据库备份与还原类实例

<?php??
/**?
?* 创建时间： 2012年5月21日?
?*?
?* 说明：分卷文件是以_v1.sql为结尾(20120522021241_all_v1.sql)?
?* 功能：实现mysql数据库分卷备份,选择表进行备份,实现单个sql文件及分卷sql导入?
?* 使用方法：?
?*?
?* ------1. 数据库备份(导出)------------------------------------------------------------?
//分别是主机,用户名,暗码,数据库名,数据库编码?
$db = new DBManage ( 'localhost','root','test','utf8' );?
// 参数：备份哪个表(可选),备份目录(可选,默认为backup),分卷大小(可选,默认2000,即2M)?
$db->backup ();?
?* ------2. 数据库恢复(导入)------------------------------------------------------------?
//分别是主机,'utf8' );?
//参数：sql文件?
$db->restore ( './backup/20120516211738_all_v1.sql');?
?*----------------------------------------------------------------------?
?*/?
class DBManage??
{??
??? var $db; // 数据库连接??
??? var $database; // 所用数据库??
??? var $sqldir; // 数据库备份文件夹??
??? var $record;??
??? // 换行符??
??? private $ds = "n";??
??? // 存储SQL的变量??
??? public $sqlContent = "";??
??? // 每条sql语句的结尾符??
??? public $sqlEnd = ";";??
??? /**?
???? * 初始化?
???? *?
???? * @param string $host?
???? * @param string $username?
???? * @param string $password?
???? * @param string $thisatabase?
???? * @param string $charset?
???? */?
??? function __construct($host = 'localhost',$username = 'root',$password = '',$thisatabase = 'test',$charset = 'utf8')??
??? {??
??????? $this->host = $host;??
??????? $this->username = $username;??
??????? $this->password = $password;??
??????? $this->database = $thisatabase;??
??????? $this->charset = $charset;??
??????? // 连接数据库??
??????? $this->db = mysql_connect ( $this->host,$this->username,$this->password ) or die ( "数据库连接失败." );??
??????? // 选择使用哪个数据库??
??????? mysql_select_db ( $this->database,$this->db ) or die ( "无法打开数据库" );??
??????? // 数据库编码方式??
??????? mysql_query ( 'SET NAMES ' . $this->charset,$this->db );??
??? }??
???
??? /*?
????? * ------------------------------------------数据库备份start----------------------------------------------------------?
????? */?
???
??? /**?
???? * 数据库备份?
???? * 参数：备份哪个表(可选),即2M)?
???? *?
???? * @param $string $dir?
???? * @param int $size?
???? * @param $string $tablename?
???? */?
??? function backup($tablename = '',$dir = '',$size = 2000)??
??? {??
??????? //$dir = $dir ? $dir : 'backup/';??
??????? //$size = $size ? $size : 2000;??
??????? $sql = '';??
??????? // 只备份某个表??
??????? if (! emptyempty ( $tablename ))??
??????? {??
??????????? echo '正在备份表' . $tablename . '<br />';??
??????????? // 插入dump信息??
??????????? $sql = $this->_retrieve();??
??????????? // 插入表结构信息??
??????????? $sql .= $this->_insert_table_structure ( $tablename );??
??????????? // 插入数据??
??????????? $data = mysql_query ( "select * from " . $tablename );??
??????????? // 文件名前面部分??
??????????? $filename = date ( 'YmdHis' ) . "_" . $tablename;??
??????????? // 字段数量??
??????????? $num_fields = mysql_num_fields ( $data );??
??????????? // 第几分卷??
??????????? $p = 1;??
??????????? // 循环每条记录??
??????????? while ( $record = mysql_fetch_array ( $data ) )??
??????????? {??
??????????????? // 单条记录??
??????????????? $sql .= $this->_insert_record ( $tablename,$num_fields,$record );??
??????????????? // 如果大于分卷大小,则写入文件??
??????????????? if (strlen ( $sql ) >= $size * 1000)??
??????????????? {??
??????????????????? $file = $filename . "_v" . $p . ".sql";??
??????????????????? if ($this->_write_file ( $sql,$file,$dir ))??
??????????????????? {??
??????????????????????? echo "表-" . $tablename . "-卷-" . $p . "-数据备份完成,生成备份文件 <span style='color:#f00;'>$dir$filename</span><br />";??
??????????????????? }??
??????????????????? else?
??????????????????? {??
??????????????????????? echo "备份表-" . $tablename . "-失败<br />";??
??????????????????? }??
??????????????????? // 下一个分卷??
??????????????????? $p ++;??
??????????????????? // 重置$sql变量为空,重新计算该变量大小??
??????????????????? $sql = "";??
??????????????? }??
??????????? }??
??????????? // sql大小不够分卷大小??
??????????? if ($sql != "")??
??????????? {??
??????????????? $filename .= "_v" . $p . ".sql";??
??????????????? if ($this->_write_file ( $sql,$filename,$dir ))??
??????????????? {??
??????????????????? echo "表-" . $tablename . "-卷-" . $p . "-数据备份完成,生成备份文件 <span style='color:#f00;'>$dir$filename</span><br />";??
??????????????? }??
??????????????? else?
??????????????? {??
??????????????????? echo "备份卷-" . $p . "-失败<br />";??
??????????????? }??
??????????? }??
??????? }??
??????? else?
??????? { // 备份全部表??
??????????? if ($tables = mysql_query ( "show table status from " . $this->database ))??
??????????? {??
??????????????? echo "读取数据库结构成功!<br />";??
??????????? }??
??????????? else?
??????????? {??
??????????????? exit ( "读取数据库结构成功!<br />" );??
??????????? }??
??????????? // 插入dump信息??
??????????? $sql .= $this->_retrieve();??
??????????? // 文件名前面部分??
??????????? $filename = date ( 'YmdHis' ) . "_all";??
??????????? // 查出所有表??
??????????? $tables = mysql_query ( 'SHOW TABLES' );??
??????????? // 第几分卷??
??????????? $p = 1;??
??????????? // 循环所有表??
??????????? while ( $table = mysql_fetch_array ( $tables ) )??
??????????? {??
??????????????? // 获取表名??
??????????????? $tablename = $table [0];??
??????????????? // 获取表结构??
??????????????? $sql .= $this->_insert_table_structure ( $tablename );??
??????????????? $data = mysql_query ( "select * from " . $tablename );??
??????????????? $num_fields = mysql_num_fields ( $data );??
???
??????????????? // 循环每条记录??
??????????????? while ( $record = mysql_fetch_array ( $data ) )??
??????????????? {??
??????????????????? // 单条记录??
??????????????????? $sql .= $this->_insert_record ( $tablename,$record );??
??????????????????? // 如果大于分卷大小,则写入文件??
??????????????????? if (strlen ( $sql ) >= $size * 1000)??
??????????????????? {??
???
??????????????????????? $file = $filename . "_v" . $p . ".sql";??
??????????????????????? // 写入文件??
??????????????????????? if ($this->_write_file ( $sql,$dir ))??
??????????????????????? {??
??????????????????????????? echo "-卷-" . $p . "-数据备份完成,生成备份文件<span style='color:#f00;'>$dir$file</span><br />";??
??????????????????????? }??
??????????????????????? else?
??????????????????????? {??
??????????????????????????? echo "备份卷-" . $p . "-失败<br />";??
??????????????????????? }??
??????????????????????? // 下一个分卷??
??????????????????????? $p ++;??
??????????????????????? // 重置$sql变量为空,重新计算该变量大小??
??????????????????????? $sql = "";??
??????????????????? }??
??????????????? }??
??????????? }??
??????????? // sql大小不够分卷大小??
??????????? if ($sql != "")??
??????????? {??
??????????????? $filename .= "_v" . $p . ".sql";??
??????????????? if ($this->_write_file ( $sql,$dir ))??
??????????????? {??
??????????????????? echo "-卷-" . $p . "-数据备份完成,生成备份文件 <span style='color:#f00;'>$dir$filename<br />";??
??????????????? }??
??????????????? else?
??????????????? {??
??????????????????? echo "备份卷-" . $p . "-失败<br />";??
??????????????? }??
??????????? }??
??????? }??
??? }??
???
??? /**?
???? * 插入数据库备份基础信息?
???? *?
???? * @return string?
???? */?
??? private function _retrieve() {??
??????? $value = '';??
??????? $value .= '--' . $this->ds;??
??????? $value .= '-- MySQL database dump' . $this->ds;??
??????? $value .= '-- Created by DBManage class,Power By yanue. ' . $this->ds;??
??????? $value .= '-- http://yanue.net ' . $this->ds;??
??????? $value .= '--' . $this->ds;??
??????? $value .= '-- 主机: ' . $this->host . $this->ds;??
??????? $value .= '-- 生成日期: ' . date ( 'Y' ) . ' 年? ' . date ( 'm' ) . ' 月 ' . date ( 'd' ) . ' 日 ' . date ( 'H:i' ) . $this->ds;??
??????? $value .= '-- MySQL版本: ' . mysql_get_server_info () . $this->ds;??
??????? $value .= '-- PHP 版本: ' . phpversion () . $this->ds;??
??????? $value .= $this->ds;??
??????? $value .= '--' . $this->ds;??
??????? $value .= '-- 数据库: `' . $this->database . '`' . $this->ds;??
??????? $value .= '--' . $this->ds . $this->ds;??
??????? $value .= '-- -------------------------------------------------------';??
??????? $value .= $this->ds . $this->ds;??
??????? return $value;??
??? }??
???
??? /**?
???? * 插入表结构?
???? *?
???? * @param unknown_type $table?
???? * @return string?
???? */?
??? private function _insert_table_structure($table) {??
??????? $sql = '';??
??????? $sql .= "--" . $this->ds;??
??????? $sql .= "-- 表的结构" . $table . $this->ds;??
??????? $sql .= "--" . $this->ds . $this->ds;??
???
??????? // 如果存在则删除表??
??????? $sql .= "DROP TABLE IF EXISTS `" . $table . '`' . $this->sqlEnd . $this->ds;??
??????? // 获取详细表信息??
??????? $res = mysql_query ( 'SHOW CREATE TABLE `' . $table . '`' );??
??????? $row = mysql_fetch_array ( $res );??
??????? $sql .= $row [1];??
??????? $sql .= $this->sqlEnd . $this->ds;??
??????? // 加上??
??????? $sql .= $this->ds;??
??????? $sql .= "--" . $this->ds;??
??????? $sql .= "-- 转存表中的数据 " . $table . $this->ds;??
??????? $sql .= "--" . $this->ds;??
??????? $sql .= $this->ds;??
??????? return $sql;??
??? }??
???
??? /**?
???? * 插入单条记录?
???? *?
???? * @param string $table?
???? * @param int $num_fields?
???? * @param array $record?
???? * @return string?
???? */?
??? private function _insert_record($table,$record) {??
??????? // sql字段逗号分割??
??????? $insert = $comma = "";??
??????? $insert .= "INSERT INTO `" . $table . "` VALUES(";??
??????? // 循环每个子段下面的内容??
??????? for($i = 0; $i < $num_fields; $i ++) {??
??????????? $insert .= ($comma . "'" .mysql_real_escape_string ( $record [$i] ) . "'");??
??????????? $comma = ",";??
??????? }??
??????? $insert .= ");" . $this->ds;??
??????? return $insert;??
??? }??
???
??? /**?
???? * 写入文件?
???? *?
???? * @param string $sql?
???? * @param string $filename?
???? * @param string $dir?
???? * @return boolean?
???? */?
??? private function _write_file($sql,$dir) {??
??????? $dir = $dir ? $dir : './backup/';??
??????? // 不存在文件夹则创建??
??????? if (! file_exists ( $dir )) {??
??????????? mkdir ( $dir );??
??????? }??
??????? $re = true;??
??????? if (! @$fp = fopen ( $dir . $filename,"w+" )) {??
??????????? $re = false;??
??????????? echo "打开文件失败!";??
??????? }??
??????? if (! @fwrite ( $fp,$sql )) {??
??????????? $re = false;??
??????????? echo "写入文件失败,请文件是否可写";??
??????? }??
??????? if (! @fclose ( $fp )) {??
??????????? $re = false;??
??????????? echo "关闭文件失败!";??
??????? }??
??????? return $re;??
??? }??
???
??? /*?
????? *?
????? * -------------------------------上：数据库导出-----------分割线----------下：数据库导入--------------------------------?
????? */?
???
??? /**?
???? * 导入备份数据?
???? * 说明：分卷文件格式20120516211738_all_v1.sql?
???? * 参数：文件路径(必填)?
???? *?
???? * @param string $sqlfile?
???? */?
??? function restore($sqlfile)??
??? {??
??????? // 检测文件是否存在??
??????? if (! file_exists ( $sqlfile ))??
??????? {??
??????????? exit ( "文件不存在!请检查" );??
??????? }??
??????? $this->lock ( $this->database );??
??????? // 获取数据库存储位置??
??????? $sqlpath = pathinfo ( $sqlfile );??
??????? $this->sqldir = $sqlpath ['dirname'];??
??????? // 检测是否包含分卷,将类似20120516211738_all_v1.sql从_v分开,有则说明有分卷??
??????? $volume = explode ( "_v",$sqlfile );??
??????? $volume_path = $volume [0];??
??????? echo "请勿刷新及关闭浏览器以防止程序被中止,如有不慎!将导致数据库结构受损<br />";??
??????? echo "正在导入备份数据,请稍等!<br />";??
??????? if (emptyempty ( $volume [1] ))??
??????? {??
??????????? echo "正在导入sql：<span style='color:#f00;'>" . $sqlfile . '</span><br />';??
??????????? // 没有分卷??
??????????? if ($this->_import ( $sqlfile )) {??
??????????????? echo "数据库导入成功!";??
??????????? }??
??????????? else?
??????????? {??
??????????????? exit ( '数据库导入失败!' );??
??????????? }??
??????? }??
??????? else?
??????? {??
??????????? //$volume_id = array();??
??????????? // 存在分卷,则获取当前是第几分卷,循环执行余下分卷??
??????????? $volume_id = explode ( ".sq",$volume [1] );??
??????????? // 当前分卷为$volume_id??
??????????? $volume_id = intval ( $volume_id [0] );??
??????????? while ( $volume_id )??
??????????? {??
??????????????? $tmpfile = $volume_path . "_v" . $volume_id . ".sql";??
??????????????? // 存在其他分卷,继续执行??
??????????????? if (file_exists ( $tmpfile )) {??
??????????????????? // 执行导入方法??
??????????????????? echo "正在导入分卷<span style='color:#f00;'>" . $tmpfile . '</span><br />';??
??????????????????? if ($this->_import ( $tmpfile ))??
??????????????????? {??
???
??????????????????? }??
??????????????????? else?
??????????????????? {??
??????????????????????? exit ( "导入分卷<span style='color:#f00;'>" . $tmpfile . '</span>失败!可能是数据库结构已损坏!请尝试从分卷1开始导入' );??
??????????????????? }??
??????????????? }??
??????????????? else?
??????????????? {??
??????????????????? echo "此分卷备份全部导入成功!<br />";??
??????????????????? return;??
??????????????? }??
??????????????? $volume_id++;??
??????????? }??
??????? }??
??? }??
???
??? /**?
???? * 将sql导入到数据库(普通导入)?
???? *?
???? * @param string $sqlfile?
???? * @return boolean?
???? */?
??? private function _import($sqlfile) {??
??????? // sql文件包含的sql语句数组??
??????? $sqls = array ();??
??????? $f = fopen ( $sqlfile,"rb" );??
??????? // 创建表缓冲变量??
??????? $create = '';??
??????? while ( ! feof ( $f ) ) {??
??????????? // 读取每一行sql??
??????????? $line = fgets ( $f );??
??????????? // 如果包含'-- '等注释,或为空白行,则跳过??
??????????? if (trim ( $line ) == '' || preg_match ( '/--*?/',$line,$match )) {??
??????????????? continue;??
??????????? }??
??????????? // 如果结尾包含';'(即为一个完整的sql语句,这里是插入语句),并且不包含'ENGINE='(即创建表的最后一句),??
??????????? if (! preg_match ( '/;/',$match ) || preg_match ( '/ENGINE=/',$match )) {??
??????????????? // 将本次sql语句与创建表sql连接存起来??
??????????????? $create .= $line;??
??????????????? // 如果包含了创建表的最后一句??
??????????????? if (preg_match ( '/ENGINE=/',$create,$match )) {??
??????????????????? // 则将其合并到sql数组??
??????????????????? $sqls [] = $create;??
??????????????????? // 清空当前,准备下一个表的创建??
??????????????????? $create = '';??
??????????????? }??
??????????????? // 跳过本次??
??????????????? continue;??
??????????? }??
??????????? $sqls [] = $line;??
??????? }??
??????? fclose ( $f );??
??????? // 循环sql语句数组,分别执行??
??????? foreach ( $sqls as $sql ) {??
??????????? str_replace ( "n","",$sql );??
??????????? if (! mysql_query ( trim ( $sql ) )) {??
??????????????? echo mysql_error ();??
??????????????? return false;??
??????????? }??
??????? }??
??????? return true;??
??? }??
???
??? /*?
????? * -------------------------------数据库导入end---------------------------------?
????? */?
???
??? // 关闭数据库连接??
??? private function close() {??
??????? mysql_close ( $this->db );??
??? }??
???
??? // 锁定数据库,以免备份或导入时出错??
??? private function lock($tablename,$op = "WRITE") {??
??????? if (mysql_query ( "lock tables " . $tablename . " " . $op ))??
??????????? return true;??
??????? else?
??????????? return false;??
??? }??
???
??? // 解锁??
??? private function unlock() {??
??????? if (mysql_query ( "unlock tables" ))??
??????????? return true;??
??????? else?
??????????? return false;??
??? }??
???
??? // 析构??
??? function __destruct() {??
??????? mysql_query ( "unlock tables",$this->db );??
??????? mysql_close ( $this->db );??
??? }
}
?
$db = new DBManage ( 'localhost','','tao','gbk' );?
//$db->backup ('tao_admin');??
$db->restore ( './backup/20140228222713_tao_admin_v1.sql');
?>