blocks|key|1296474|text|这些是参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296475|-uROOT+-pPASSWORD+--数据库DB+--结果文件=FILE.SQL|1296476|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

These are the parameters

-uROOT -pPASSWORD --databases DB --result-file=FILE.SQL

blocks|key|1296630|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296631|$command+=+'d:\xampp\mysql\bin\mysqldump+--opt+-u+'.$_user.'+-p'.$_pass.'+'.$_db.'+>+test.sql+2>&1';|code-block|syntax|javascript|1296632|关于权限问题的-its。|1296633|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this one:

<pre><code>$command = 'd:\xampp\mysql\bin\mysqldump --opt -u '.$_user.' -p'.$_pass.' '.$_db.' &gt; test.sql 2&gt;&amp;1';
</code></pre>

-its about permission issue.

blocks|key|1773682|text|您应该删除-p和密码之间的空格。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1773683|最近版本的mysql不需要--opt。|offset|length|style|CODE|1773684|除此之外，您的语法是正确的，因此如果它不适用于-p修复程序，您应该检查参数和生成的命令。|1773685|entityMap^0|0|D|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

You should remove the space between the -p and the password.

<code>--opt</code> isn't needed with recent versions of mysql.

Other than that, your syntax is correct so if it doesn't work with the -p fix, you should check the parameters and the produced command.

blocks|key|878305|text|如果您查看exec的手册，输出将转到一个数组，这是第二个参数。这可能是问题的根源。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|878306|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.exec.php^0|5|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you look at the manual for <a href="http://php.net/manual/en/function.exec.php" rel="nofollow">exec</a> the output goes to an array that is the second argument. That may be the source of the problem.

blocks|key|878321|text|把变量从引号中取出来，然后删除--opt。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|878322|还要确保您有唯一的文件名。|878323|$backupfile+=+$dbname+.+date("Y-m-d-H-i-s")+.+'.sql';|offset|length|style|CODE|878324|$command+=+"D:\xampp\mysql\bin\mysqldump+-u+$_user+-p$_pass+$_db+>+$backupfile";|878325|system($command);|878326|entityMap^0|0|0|0|1H|0|0|28|0|0|H|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@$F|S|G|T|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$F|V|G|W|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@$F|Y|G|Z|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|O|$]]

Take the variables out of the quotes and remove --opt.

Also make sure that you are having unique file names

<code>$backupfile = $dbname . date("Y-m-d-H-i-s") . '.sql';</code>

<code>$command = "D:\xampp\mysql\bin\mysqldump -u $_user -p$_pass $_db > $backupfile";</code>

<code>system($command);</code>

blocks|key|880451|text|为Macs上的那些|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|880452|今天整个晚上我都在和这个问题做斗争。愚蠢的错误:一个需要修改您要将文件转储到的目录。|880453|我运行了这个解决问题的方法：|880454|chmod+-R+777+your_dump_directory/|code-block|syntax|javascript|880455|entityMap^0|0|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|V|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

For those on Macs

I was battling this issue the entire evening today. Silly mistake: one needs to chmod the directory that you are dumping the file to.

I ran this which fixed the issue:

<pre><code>chmod -R 777 your_dump_directory/
</code></pre>

blocks|key|1773857|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1773858|$DBUSER="user";
$DBPASSWD="password";
$DATABASE="DBname";

$filename+=+"backup-"+.+date("d-m-Y")+.+".sql";

$command+=+'"C:\Program+Files\MySQL\MySQL+Server+5.5\bin\mysqldump.exe"+'.$DATABASE+."+-u".$DBUSER+."+-p".$DBPASSWD."+>+your_web_site/$filename";
passthru($command);|code-block|syntax|javascript|1773859|将路由更改为计算机的mysqldump.exe应用程序的方向。|unordered-list-item|1773860|尊重命令中的“”。|1773861|然后强制下载文件：|1773862|if+(file_exists("your_web_site/".$filename))+{
header('Content-Description:+File+Transfer');
header('Content-Type:+application/octet-stream');
header('Content-Disposition:+attachment;+filename="'.basename($filename).'"');
header('Expires:+0');
header('Cache-Control:+must-revalidate');
header('Pragma:+public');
readfile("your_web_site/".$filename);
exit;
}|1773863|编辑:您必须将权限授予保存副本的文件夹。|1773864|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|I|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|I|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|P|3|Q|5|6|7|Z|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|S|$]]

Try this:

<pre><code>$DBUSER="user";
$DBPASSWD="password";
$DATABASE="DBname";

$filename = "backup-" . date("d-m-Y") . ".sql";

$command = '"C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqldump.exe" '.$DATABASE ." -u".$DBUSER ." -p".$DBPASSWD." &gt; your_web_site/$filename";
passthru($command);
</code></pre>

<ul>
<li>Change the route to the direction of the mysqldump.exe application of your computer.</li>
<li>Respect the " " inside the command.</li>
</ul>

Then force the download of the file:

<pre><code>if (file_exists("your_web_site/".$filename)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($filename).'"');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
readfile("your_web_site/".$filename);
exit;
}
</code></pre>

Edit: You have to give permissions to the folder where you keep copies.

blocks|key|880466|text|请确保为WAMP设置MySQL+bin文件夹的路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|880467|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Please make sure set PATH for MySQL bin folder for WAMP.

I want to create a backup from a database, but I get only a blank file.

<pre><code>include('config.php');

$command = "mysqldump --opt -h ".$_host." -u ".$_user." -p ".$_pass." ".$_db." &gt; test.sql";
exec($command);

echo "&lt;br /&gt;".$command;
</code></pre>

test.sql is created where the .php file is located.

Edit:

Note! I'm using XAMPP WINDOWS !

Solution:

Because I'm using a Windows Web Server (XAMPP), I needed to specify the path:

<pre><code>$command = 'd:\xampp\mysql\bin\mysqldump --opt -u '.$_user.' -p'.$_pass.' '.$_db.' &gt; test.sql';
</code></pre>

<ol>
<li>I removed the space between the -p and the pass. It looks like: <code>-pMYPASSWORD</code></li>
<li>Replaced <code>"</code> with <code>'</code></li>
</ol>

I think if you are using a Linux based web server, you don't have to specify the path for mysqldump.

Cheers! :-)

php exec() - mysqldump creates an empty file

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想从数据库中创建一个备份，但是我只得到一个空白文件。include('config.php');$command = "mysqldump --opt -h ".$_host." -u ".$_user." -p ".$_pass." ".$_db." > test.sql";exec($command);echo " ".$command;test.sql是在.php文件所在位置创建

问php ()- mysqldump创建一个空文件
EN

回答 8

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