Re: sql query
| From: | Jason Petersen | Date: | Wed, 02 Mar 2005 16:06:40 +0000 |
| Subject: | Re: sql query | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-209809@lists.php.net to get a copy of this message | ||
On Wed, 2 Mar 2005 13:02:39 +0200, William Stokes <kalles@operamail.com> wrote:
> Hello
>
> Can someone explain this to me. I don't know how to read this.
>
> if (!$variable = mysql_query("select id,sessid from users where ...
>
> What is this "if(!"
This is a way to run a SQL query, capture the return value, and
perform an action if the query failed. For code readability, I would
probably write that as two statements:
$variable = mysql_query("SELECT * FROM blah");
if(!$variable) { error_handler(mysql_error()); }
See the documentation for information on mysql_query return values:
http://us2.php.net/manual/en/function.mysql-query.php
Jason