Php Sql Error Handling
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring http://stackoverflow.com/questions/1918624/php-try-and-catch-for-sql-insert developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join http://www.dreamincode.net/forums/topic/185726-database-error-handling-in-php-5/ them; it only takes a minute: Sign up PHP Try and Catch for SQL Insert up vote 18 down vote favorite 1 I have a page on my website (high traffic) that does an insert on every page load. I sql error am curious of the fastest and safest way to (catch an error) and continue if the system is not able to do the insert into MySQL. Should I use try/catch or die or something else. I want to make sure the insert happens but if for some reason it can't I want the page to continue to load anyway. ... $db = mysql_select_db('mobile', $conn); mysql_query("INSERT INTO redirects SET ua_string = '$ua_string'") or die('Error #10'); mysql_close($conn); ... php mysql performance sql error handling error-handling share|improve this question asked Dec 16 '09 at 23:51 meme 5,64621218 On the use of "or die": phpfreaks.com/blog/or-die-must-die –outis Dec 17 '09 at 0:55 1 As for exceptions vs checking return values, it depends on how many points might generate errors. With one or two points, I'd go with error checking, as it's more performant and just as readable in this case. Once you hit three or more error checks in a code block, exceptions become more readable. It's all about reducing cyclomatic complexity. Note that this covers the point you handle the error; if you're talking about signaling errors, you'll wind up with different guidelines. –outis Dec 17 '09 at 0:59 add a comment| 8 Answers 8 active oldest votes up vote 23 down vote Checking the documentation shows that its returns false on an error. So use the return status rather than or die(). It will return false if it fails, which you can log (or whatever you want to do) and then continue. $rv = mysql_query("INSERT INTO redirects SET ua_string = '$ua_string'"); if ( $rv === false ){ //handle the error here } //page continues loading share|improve this answer edited Nov 13 '11 at 14:27 Josh 8,41774489 answered Dec 16 '09 at 23:53 Yacoby 37.6k890111 That Doesn't throw an error? –Byron Whitlock Dec 16 '09 at 23:56 1 I don't think mysql_query throws an
PHP 5 making use of Exception Handling Rate Topic: #1 Dormilich 痛覚残留 Reputation: 4051 Posts: 12,578 Joined: 08-June 10 Posted 12 August 2010 - 02:31 PM POPULAR Database Error Handling in PHP 5 prerequisites a working installation of PHP 5 Introduction The following error message is probably one of the most encountered, when using PHP: QuoteWarning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in *** on line *** The reason for that is usually no error handling at all, so that boolean false (the return value of a failed query) is passed to a mysql_fetch_* function. The traditional way of database error handling tests the return value of each database function and kill the script, if the return value is false: // connect $cxn = mysql_connect($host, $user, $password) or die(mysql_error()); mysql_connect_db($database) or die(mysql_error()); // $sql being an SQL statement, that returns a result set $result = mysql_query($sql) or die(mysql_error()); while($row = mysql_fetch_assoc($result)) { // your result handling code } or to put it into one sentence … QuoteAlso note that it is your responsibility to die() if necessary. (ref.) While this indeed prevents the emission of PHP error messages, it has the great disadvantage of breaking your output. If this happens on a web page, you might end up with a half processed page, which not only looks ugly, but also exposes parts of your working code (the SQL error message, which can contain info of your database structure) to the user. Gentle users may ignore that, crackers will use that to exploit and crack your server. A far bigger problem is when you use XML output (RSS/Atom feeds, AJAX, XHTML served as such, etc.). XML parsers have the nasty habit to quit parsing not well-formed XML and throw a parser error (the so-called "Yellow Screen of Death"), which effectively kills your application using that output. PHP 5 -- let it flow What you need to do to prevent that is controlling the program flow without breaking the script's output. PHP 5 with its improved OOP capabilities finally provide you with a means to do that efficiently: Exceptions. You can imagine an Exception as a kind of error message, that travels through the function stack until it reaches the top level (the global scope of the script called in the URI). In contrast to errors, you are able to intercept an Exception at any level in your script. That is, you can fix the problem that caused the Exception. After you have caught an Exception, the script will continue processing from the point the Exception was caught, meani