blocks|key|3377488|text|两个delete语句之间缺少分号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3377489|此外，mysql_query不支持多个查询。|offset|length|style|CODE|3377490|来自the+documentation|3377491|3377492|+mysql_query()将唯一查询(不支持多个查询)发送到与指定link_identifier.`|blockquote|BOLD|3377493|
关联的服务器上的当前活动数据库|3377494|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/manual/en/function.mysql-query.php^0|0|3|B|0|2|H|0|0|0|J|9|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@$D|13|E|14|1|15]]|A|$]]|$1|J|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|17|8|@$D|18|E|19|F|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

You are missing a semicolon between your two delete statements.

Also, multiple queries are not supported in <code>mysql_query</code>.

From <a href="http://us2.php.net/manual/en/function.mysql-query.php" rel="nofollow">the documentation</a>:

<blockquote>
 mysql_query() sends a unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified link_identifier.`
</blockquote>

blocks|key|4977915|text|不能一次在mysql_query()函数中运行多个查询。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4977916|尝试使用mysqli::multi_query来运行多个查询。查询可以用;分隔|style|CODE|4977917|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.mysql-query.php|1|http://php.net/manual/en/mysqli.multi-query.php^0|5|D|0|0|10|1|4|J|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@$A|W|B|X|F|G]]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|H|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

You can not run multiple queries in <a href="http://php.net/manual/en/function.mysql-query.php" rel="nofollow">mysql_query()</a> function in once.

Try <a href="http://php.net/manual/en/mysqli.multi-query.php" rel="nofollow">mysqli::multi_query</a> instead to run multiple queries. queries can be separated by <code>;</code>

blocks|key|4978040|text|从手册中引用(我的重点)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4978041|4978042|+mysql_query()发送唯一查询(不支持多个查询)|blockquote|4978043|4978044|4978045|如果您想在一个查询中执行多个SQL语句，则需要使用mysqli和multi-query，并且每条语句都需要用分号(;)分隔。|offset|length|4978046|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/book.mysqli.php|1|http://php.net/manual/en/mysqli.multi-query.php^0|0|0|0|0|0|P|6|0|W|B|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|X|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@$J|11|K|12|1|13]|$J|14|K|15|1|16]]|A|$]]|$1|L|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

Quoting from the manual (my emphasis)

<blockquote>
 mysql_query() sends a unique query (multiple queries are not supported) 
</blockquote>

If you want to execute several SQL statements in a single query, you need to use <a href="http://php.net/manual/en/book.mysqli.php" rel="nofollow">mysqli</a> and <a href="http://php.net/manual/en/mysqli.multi-query.php" rel="nofollow">multi-query</a>, and each statement needs to be separated by a semi-colon (;)

blocks|key|4978079|text|因为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4978080|4978081|你正在发送一个无效语法的查询，|unordered-list-item|4978082|，即使你在查询之间添加了分号(否则MySQL服务器怎么知道你的第二个查询从哪里开始呢？！？)，PHP的旧库doesn't+support就在这里。|offset|length|4978083|4978084|请改用mysqli.multi_query()。|style|CODE|4978085|您还应该使用准备好的语句，或者至少清理您的输入，因为您的代码有一个巨大的SQL注入漏洞(人们怎么还在这样编写PHP？！？他们在这些“学校”里教什么？！啊！)|4978086|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.mysql-query.php|1|http://www.php.net/manual/en/mysqli.multi-query.php^0|0|0|0|1H|F|0|0|0|3|K|3|K|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|13|8|@]|9|@$H|14|I|15|1|16]]|A|$]]|$1|J|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|18|8|@$H|19|I|1A|M|N]]|9|@$H|1B|I|1C|1|1D]]|A|$]]|$1|O|3|P|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

Because:

<ul>
<li>you're sending one query with invalid syntax, and</li>
<li>even if you'd added the semicolon between queries (how else is the MySQL server supposed to know where your second query starts?!?), PHP's old library <a href="http://www.php.net/manual/en/function.mysql-query.php" rel="nofollow">doesn't support</a> that here.</li>
</ul>

Use <a href="http://www.php.net/manual/en/mysqli.multi-query.php" rel="nofollow"><code>mysqli.multi_query()</code></a> instead.

You should also either use prepared statements or at the very least sanitise your inputs, as your code has a huge SQL Injection vulnerability (how are people still writing PHP like this?!? what are they teaching in these "schools"?! aghh!)

blocks|key|1310532|text|PHP不允许一次运行2个查询。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1310533|你需要将你的查询分成两个变量，然后逐个运行它们。|1310534|http://php.net/manual/en/function.mysql-query.php|offset|length|1310535|文档解释如下：|1310536|1310537|+mysql_query()向与指定link_identifier关联的服务器上的当前活动数据库发送唯一查询(不支持多个查询)。|blockquote|1310538|1310539|1310540|标准的MySQL分隔符(；)在这里不起作用。|1310541|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1D|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@$F|11|G|12|1|13]]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|16|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|E]]]]

PHP does not allow running 2 queries in one go.

You need to split your queries in 2 variables and run them one by one.

<a href="http://php.net/manual/en/function.mysql-query.php" rel="nofollow">http://php.net/manual/en/function.mysql-query.php</a>

The documentation explains:

<blockquote>
 mysql_query() sends a unique query
 (multiple queries are not supported)
 to the currently active database on
 the server that's associated with the
 specified link_identifier.
</blockquote>

The standard MySQL separator semicolon ( ; ) will not work here.

blocks|key|1310659|text|如果您希望在多个表中指定多个delete条件，那么可以对DELETE语句使用JOIN语法，但是这可能效率不高--但这样，查询将适合mysql_query()；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1310660|有人已经提到了mysqli和multi_query函数，对此竖起大拇指:)|1310661|另一方面，您的代码极易受到SQL注入攻击，在直接在查询中使用$_POST和$_GET输入之前，请务必清理它们！|1310662|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If you wish to specify multiple delete conditions across several tables, then you can use JOIN syntax for the DELETE statement, however this might be inefficient - but that way, the query will fit within mysql_query();

Someone already mentioned mysqli and multi_query function, thumbs up for that :)

On the other hand, your code is extremely prone to SQL injection attacks, always clean your $_POST and $_GET input before using it in the query directly!

blocks|key|1310510|text|在'echo+'Mysql查询失败后添加mysql_error+($link)！‘；’行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1310511|这就解释了这个问题。|1310512|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|$]]

Add mysql_error ($link) after 'echo 'Mysql query failed!';' line

That will explain the problem.

<pre><code>$qry1 = "DELETE FROM
 si_topics
WHERE
 topic_id = '". $_GET['topic'] ."'
DELETE FROM 
 si_posts
WHERE
 topic_id = '". $_GET['topic'] ."'";

$mysqlqry1 = mysql_query($qry1);
if($mysqlqry1){
 echo 'Topic deleted from database!';
} else {
 echo 'Mysql query failed!';
}
</code></pre>

This gives the message <code>Mysql query failed!</code>, why?

Greetings

2 Mysql queries in 1 variable, help?

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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$qry1 = "DELETE FROM    si_topicsWHERE    topic_id = '". $_GET['topic'] ."'DELETE FROM     si_postsWHERE    topic_id = '". $_GET['topic'] ."'";$mysqlqry1 = mysql_query($qry1);if($mysqlqry1){    echo '

问2个Mysql查询在1个变量中，帮助？
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