blocks|key|691567|text|2种方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|691568|如果您正在运行一个测试服务器，并且希望恢复您正在更改的所有信息，那么您可以在备份和恢复之后使表值在update之后。|offset|length|style|CODE|691569|否则，如果您在事务级别上讨论，您可以创建一个事务，而不是提交，而是回滚。|691570|<?php
/*+Begin+a+transaction,+turning+off+autocommit+*/
$dbh->beginTransaction();

/*+Change+the+database+schema+and+data+*/
$sth+=+$dbh->exec("DROP+TABLE+fruit");
$sth+=+$dbh->exec("UPDATE+dessert
++++SET+name+=+'hamburger'");

/*+Recognize+mistake+and+roll+back+changes+*/
$dbh->rollBack();

/*+Database+connection+is+now+back+in+autocommit+mode+*/
?>|code-block|syntax|javascript|691571|entityMap|0|LINK|mutability|MUTABLE|url|http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html|1|http://dev.mysql.com/doc/refman/5.1/en/mysqlimport.html|2|http://php.net/manual/en/pdo.begintransaction.php^0|0|1D|6|12|2|0|15|2|1|0|M|D|2|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@$D|14|E|15|1|16]|$D|17|E|18|1|19]]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@$D|1B|E|1C|1|1D]]|A|$]]|$1|J|3|K|5|L|7|1E|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]|Y|$5|R|S|T|A|$U|Z]]]]

2 Ways.

If you're running a test server and want to restore back all of the info that you're changing, then you can make a <a href="http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html" rel="nofollow">backup</a> and <a href="http://dev.mysql.com/doc/refman/5.1/en/mysqlimport.html" rel="nofollow">restore</a> the table values after the <code>update</code>.

otherwise if you're talking about at the transaction level you can make a <a href="http://php.net/manual/en/pdo.begintransaction.php" rel="nofollow">transaction and instead of committing, roll it back</a>.

<pre><code>&lt;?php
/* Begin a transaction, turning off autocommit */
$dbh-&gt;beginTransaction();

/* Change the database schema and data */
$sth = $dbh-&gt;exec("DROP TABLE fruit");
$sth = $dbh-&gt;exec("UPDATE dessert
 SET name = 'hamburger'");

/* Recognize mistake and roll back changes */
$dbh-&gt;rollBack();

/* Database connection is now back in autocommit mode */
?&gt;
</code></pre>

blocks|key|469359|text|是的，正如sgeddes所说，你可以使用一个交易。当您使用不是transaction的committed时，您可以在执行查询之前将rollback设置为状态。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|469360|试试这个：|469361|//Start+the+transaction
mysql_query("START+TRANSACTION");

//An+update+query
$yourUpdateQuery+=+mysql_query("UPDATE+YOUR_TBL+SET+COLUMN+=+'COLUMN_VALUE'+WHERE+COLUMN_ID+=+ID_VALUE");

//Some+SQL+select+queries+(note,+that+this+do+not+have+effect+on+your+data,+so+this+don't+need+to+be+in+your+transaction
$sql+=+mysql_query("select+*+from+table");
while($row+=+mysql_fetch_array($sql))
{
++++echo+$row['name'];
}

//Some+check+here
if+(1==1)+{
++++//Ok,+let's+finish+it
++++mysql_query("COMMIT");
}+else+{++++++++
++++//Not+ok,+rollback+to+the+state+before+the+transaction+started.
++++mysql_query("ROLLBACK");
}+|code-block|syntax|javascript|469362|注意到，您和上面的示例使用的是不推荐的mysql_*函数。您应该使用PDO而不是mysql_*。下面是一个PDO示例：|BOLD|469363|<?php

++++//PDO+Database+connection+(if+you+haven't+done+this)
++++$db+=+new+PDO('mysql:host=localhost;dbname=DATABASE_NAME',+"USERNAME",+"PASSWORD");

++++//Start+the+transaction
++++$db->beginTransaction();

++++//An+update+query
++++$db+=+$db->exec("UPDATE+YOUR_TBL+SET+COLUMN+=+'COLUMN_VALUE'+WHERE+COLUMN_ID+=+ID_VALUE");

++++//Some+SQL+select+queries+(note,+that+this+do+not+have+effect+on+your+data,+so+this+don't+need+to+be+in+your+transaction
++++$sql+=+'select+*+from+table';
++++foreach($db->query($sql)+as+$row)
++++{
++++++++echo+$row['name'];
++++}

++++//Some+check+here
++++if+(1==1)+{
++++++++//Ok,+let's+finish+it
++++++++$db->commit();
++++}+else+{++++++++
++++++++//Not+ok,+rollback+to+the+state+before+the+transaction+started.
++++++++$db->rollBack();
++++}+++



?>|469364|entityMap^0|V|B|17|9|1T|8|0|0|0|0|3|J|7|Y|3|14|7|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|12|8|@$9|13|A|14|B|O]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|R|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|S|$]]

Yes you can, as sgeddes said, you need to use a transaction. When you use a <code>transaction</code> which is not <code>committed</code> you can <code>rollback</code> to the state before the query executed.

Try this:

<pre class="lang-php prettyprint-override"><code>//Start the transaction
mysql_query("START TRANSACTION");

//An update query
$yourUpdateQuery = mysql_query("UPDATE YOUR_TBL SET COLUMN = 'COLUMN_VALUE' WHERE COLUMN_ID = ID_VALUE");

//Some SQL select queries (note, that this do not have effect on your data, so this don't need to be in your transaction
$sql = mysql_query("select * from table");
while($row = mysql_fetch_array($sql))
{
 echo $row['name'];
}

//Some check here
if (1==1) {
 //Ok, let's finish it
 mysql_query("COMMIT");
} else { 
 //Not ok, rollback to the state before the transaction started.
 mysql_query("ROLLBACK");
} 
</code></pre>

Note that you and the above example are using <code>mysql_*</code> functions which are deprecated. You should use <code>PDO</code> instead of <code>mysql_*</code>.
Here is a PDO example:

<pre><code>&lt;?php

 //PDO Database connection (if you haven't done this)
 $db = new PDO('mysql:host=localhost;dbname=DATABASE_NAME', "USERNAME", "PASSWORD");

 //Start the transaction
 $db-&gt;beginTransaction();

 //An update query
 $db = $db-&gt;exec("UPDATE YOUR_TBL SET COLUMN = 'COLUMN_VALUE' WHERE COLUMN_ID = ID_VALUE");

 //Some SQL select queries (note, that this do not have effect on your data, so this don't need to be in your transaction
 $sql = 'select * from table';
 foreach($db-&gt;query($sql) as $row)
 {
 echo $row['name'];
 }

 //Some check here
 if (1==1) {
 //Ok, let's finish it
 $db-&gt;commit();
 } else { 
 //Not ok, rollback to the state before the transaction started.
 $db-&gt;rollBack();
 } 



?&gt;
</code></pre>

can here is any reset query which reset the table after update. 
I update a colum and then I want to reset it. 

<pre><code> id name
 1 azeem
 2 arfan
</code></pre>

update the table. 

<pre><code> update table set name = 'abc' where id = 1;
 update table set name = 'xyz' where id = 2;

id name
1 abc
2 xyz
</code></pre>

Update: 

<pre><code> $sql = mysql_query("select * from table");
 while($row = mysql_fetch_array($sql)){
 echo $row['name'];
 }
</code></pre>

After that I want to reset it. How can I do that.?

Reset a table using query in sql

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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这里可以是在更新后重置表的任何重置查询。我更新了一个colum然后我想重新设置它。 id      name 1       azeem 2       arfan更新表格。  update table set name = 'abc' where id = 1;  update table set name = 'x...

问使用sql中的查询重置表
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