mydb数据库备份程序（PHP版）

<? global $mysqlhost, $mysqluser, $mysqlpwd, $mysqldb; $mysqlhost="localhost"; //host name $mysqluser="root"; //login name $mysqlpwd=""; //password $mysqldb=""; //name of database include("mydb.php"); $d=new db($mysqlhost,$mysqluser,$mysqlpwd,$mysqldb); /*--------------界面--------------*/if(!$_POST['act']){/*----------------------*/ $msgs[]="服务器备份目录为backup"; $msgs[]="对于较大的数据表，强烈建议使用分卷备份"; $msgs[]="只有选择备份到服务器，才能使用分卷备份功能"; show_msg($msgs); ?> <form name="form1" method="post" action="backup.php"> <table width="99%" border="1" cellpadding='0' cellspacing='1'> <tr align="center" class='header'><td colspan="2">数据备份</td></tr> <tr><td colspan="2">备份方式</td></tr> <tr><td><input type="radio" name="bfzl" value="quanbubiao"> 备份全部数据</td><td>备份全部数据表中的数据到一个备份文件</td></tr> <tr><td><input type="radio" name="bfzl" value="danbiao">备份单张表数据 <select name="tablename"><option value="">请选择</option> <? $d->query("show table status from $mysqldb"); while($d->nextrecord()){ echo "<option value='".$d->f('Name')."'>".$d->f('Name')."</option>";} ?> </select></td><td>备份选中数据表中的数据到单独的备份文件</td></tr> <tr><td colspan="2">使用分卷备份</td></tr> <tr><td colspan="2"><input type="checkbox" name="fenjuan" value="yes"> 分卷备份 <input name="filesize" type="text" size="10">K</td></tr> <tr><td colspan="2">选择目标位置</td></tr> <tr><td colspan="2"><input type="radio" name="weizhi" value="server" checked>备份到服务器</td></tr><tr class="cells"><td colspan='2'> <input type="radio" name="weizhi" value="localpc"> 备份到本地</td></tr> <tr><td colspan="2" align='center'><input type="submit" name="act" value="备份"></td></tr> </table></form> <?/*-------------界面结束-------------*/}/*---------------------------------*/ /*----*/else{/*--------------主程序-----------------------------------------*/ if($_POST['weizhi']=="localpc"&&$_POST['fenjuan']=='yes') {$msgs[]="只有选择备份到服务器，才能使用分卷备份功能"; show_msg($msgs); pageend();} if($_POST['fenjuan']=="yes"&&!$_POST['filesize']) {$msgs[]="您选择了分卷备份功能，但未填写分卷文件大小"; show_msg($msgs); pageend();} if($_POST['weizhi']=="server"&&!writeable("./backup")) {$msgs[]="备份文件存放目录'./backup'不可写，请修改目录属性"; show_msg($msgs); pageend();} /*----------备份全部表-------------*/if($_POST['bfzl']=="quanbubiao"){/*----*/ /*----不分卷*/if(!$_POST['fenjuan']){/*--------------------------------*/ if(!$tables=$d->query("show table status from $mysqldb")) {$msgs[]="读数据库结构错误"; show_msg($msgs); pageend();} $sql=""; while($d->nextrecord($tables)) { $table=$d->f("Name"); $sql.=make_header($table); $d->query("select * from $table"); $num_fields=$d->nf(); while($d->nextrecord()) {$sql.=make_record($table,$num_fields);} } $filename=date("Ymd",time())."_all.sql"; if($_POST['weizhi']=="localpc") down_file($sql,$filename); elseif($_POST['weizhi']=="server") {if(write_file($sql,$filename)) $msgs[]="全部数据表数据备份完成,生成备份文件'./backup/$filename'"; else $msgs[]="备份全部数据表失败"; show_msg($msgs); pageend(); } /*-----------------不要卷结束*/}/*-----------------------*/ /*-----------------分卷*/else{/*-------------------------*/ if(!$_POST['filesize']) {$msgs[]="请填写备份文件分卷大小"; show_msg($msgs);pageend();} if(!$tables=$d->query("show table status from $mysqldb")) {$msgs[]="读数据库结构错误"; show_msg($msgs); pageend();} $sql=""; $p=1; $filename=date("Ymd",time())."_all"; while($d->nextrecord($tables)) { $table=$d->f("Name"); $sql.=make_header($table); $d->query("select * from $table"); $num_fields=$d->nf(); while($d->nextrecord()) {$sql.=make_record($table,$num_fields); if(strlen($sql)>=$_POST['filesize']*1000){ $filename.=("_v".$p.".sql"); if(write_file($sql,$filename)) $msgs[]="全部数据表-卷-".$p."-数据备份完成,生成备份文件'./backup/$filename'"; else $msgs[]="备份表-".$_POST['tablename']."-失败"; $p++; $filename=date("Ymd",time())."_all"; $sql="";} } } if($sql!=""){$filename.=("_v".$p.".sql"); if(write_file($sql,$filename)) $msgs[]="全部数据表-卷-".$p."-数据备份完成,生成备份文件'./backup/$filename'";} show_msg($msgs); /*---------------------分卷结束*/}/*--------------------------------------*/ /*--------备份全部表结束*/}/*---------------------------------------------*/ /*--------备份单表------*/elseif($_POST['bfzl']=="danbiao"){/*------------*/ if(!$_POST['tablename']) {$msgs[]="请选择要备份的数据表"; show_msg($msgs); pageend();} /*--------不分卷*/if(!$_POST['fenjuan']){/*-------------------------------*/ $sql=make_header($_POST['tablename']); $d->query("select * from ".$_POST['tablename']); $num_fields=$d->nf(); while($d->nextrecord()) {$sql.=make_record($_POST['tablename'],$num_fields);} $filename=date("Ymd",time())."_".$_POST['tablename'].".sql"; if($_POST['weizhi']=="localpc") down_file($sql,$filename); elseif($_POST['weizhi']=="server") {if(write_file($sql,$filename)) $msgs[]="表-".$_POST['tablename']."-数据备份完成,生成备份文件'./backup/$filename'"; else $msgs[]="备份表-".$_POST['tablename']."-失败"; show_msg($msgs); pageend(); } /*----------------不要卷结束*/}/*------------------------------------*/ /*----------------分卷*/else{/*--------------------------------------*/ if(!$_POST['filesize']) {$msgs[]="请填写备份文件分卷大小"; show_msg($msgs);pageend();} $sql=make_header($_POST['tablename']); $p=1; $filename=date("Ymd",time())."_".$_POST['tablename']; $d->query("select * from ".$_POST['tablename']); $num_fields=$d->nf(); while ($d->nextrecord()) { $sql.=make_record($_POST['tablename'],$num_fields); if(strlen($sql)>=$_POST['filesize']*1000){ $filename.=("_v".$p.".sql"); if(write_file($sql,$filename)) $msgs[]="表-".$_POST['tablename']."-卷-".$p."-数据备份完成,生成备份文件'./backup/$filename'"; else $msgs[]="备份表-".$_POST['tablename']."-失败"; $p++; $filename=date("Ymd",time())."_".$_POST['tablename']; $sql="";} } if($sql!=""){$filename.=("_v".$p.".sql"); if(write_file($sql,$filename)) $msgs[]="表-".$_POST['tablename']."-卷-".$p."-数据备份完成,生成备份文件'./backup/$filename'";} show_msg($msgs); /*----------分卷结束*/}/*--------------------------------------------------*/ /*----------备份单表结束*/}/*----------------------------------------------*/ /*---*/}/*-------------主程序结束------------------------------------------*/ function write_file($sql,$filename) { $re=true; if(!@$fp=fopen("./backup/".$filename,"w+")) {$re=false; echo "failed to open target file";} if(!@fwrite($fp,$sql)) {$re=false; echo "failed to write file";} if(!@fclose($fp)) {$re=false; echo "failed to close target file";} return $re; } function down_file($sql,$filename) { ob_end_clean(); header("Content-Encoding: none"); header("Content-Type: ".(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') ? 'application/octetstream' : 'application/octet-stream')); header("Content-Disposition: ".(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') ? 'inline; ' : 'attachment; ')."filename=".$filename); header("Content-Length: ".strlen($sql)); header("Pragma: no-cache"); header("Expires: 0"); echo $sql; $e=ob_get_contents(); ob_end_clean(); } function writeable($dir) { if(!is_dir($dir)) { @mkdir($dir, 0777); } if(is_dir($dir)) { if($fp = @fopen("$dir/test.test", 'w')) { @fclose($fp); @unlink("$dir/test.test"); $writeable = 1; } else { $writeable = 0; } } return $writeable; } function make_header($table) {global $d; $sql="DROP TABLE IF EXISTS ".$table."\n"; $d->query("show create table ".$table); $d->nextrecord(); $tmp=preg_replace("/\n/","",$d->f("Create Table")); $sql.=$tmp."\n"; retur