Error Handling Mysql Php
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Php Mysql Query Error Handling
Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up PHP MySQL error handling up vote 2 down vote http://php.net/manual/en/mysqli.error.php favorite 1 Simple question (I hope). At the moment I am using the following code: mysql_query($sql) or header("Location: /error"); To prevent the rest of the script running I need to add exit; or die(). Is there any way to do that using the inline approach as above or do I need to use: $result = mysql_query($sql); if (!result) { header("Location: /error"); exit(); } Thanks php mysql share|improve http://stackoverflow.com/questions/4125559/php-mysql-error-handling this question edited Aug 28 '13 at 20:11 hdvianna 337211 asked Nov 8 '10 at 16:04 lethalMango 2,23583673 add a comment| 4 Answers 4 active oldest votes up vote 10 down vote accepted How about: function customDie($location) { header('Location: ' . $location); exit(); } mysql_query($sql) or customDie("/error"); share|improve this answer answered Nov 8 '10 at 16:07 Fosco 27.2k45593 Never thought about doing that, great idea. Thanks! –lethalMango Nov 8 '10 at 16:18 add a comment| up vote 5 down vote If you insist on doing things this way it is better to make a custom query method which handles all this. Something like function custom_mysql_query($query) { $doDebug=true; // Set to true when developing and false when you are deploying for real. $result=mysql_query($query); if(!$result) { if($doDebug) { // We are debugging so show some nice error output echo "Query failed\n
$query\n"; echo mysql_error(); // (Is that not the name) } else { // Might want an error message to the user here. } exit(); } } Then just call custom_mysql_query instead of mysql_query then you will always die if a query fails and if $debug is true, you will also get the query which failed and the database error. But r
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the http://stackoverflow.com/questions/1918624/php-try-and-catch-for-sql-insert workings and policies of this site About Us Learn more about Stack http://www.hackingwithphp.com/19/8/6/handling-mysql-errors Overflow the company Business Learn more about hiring 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 4.7 million programmers, just like you, helping each other. Join error handling 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 am curious of the fastest and safest way to (catch an error) and continue if the system is not php mysql error 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($conn); ... php mysql performance error-handling share|improve this question asked Dec 16 '09 at 23:51 meme 5,58621118 On the use of "or die": phpfreaks.com/blog/or-die-must-die –outis Dec 17 '09 at 0:55 1 As for exceptions vs checking return values, it depends on how many points might generate errors. With one or two points, I'd go with error checking, as it's more performant and just as readable in this case. Once you hit three or more error checks in a code block, exceptions become more readable. It's all about reducing cyclomatic complexity. Note that this covers the point you handle the error; if you're talking about signaling errors, you'll wind up with different guidelines. –outis Dec 17 '09 at 0:59
to fix than pure PHP problems because you can narrow down the position of the error very easily, then analyse the faulty SQL line to spot the problem. There are several ways to debug your SQL usage: Firstly, always check your code is actually correct - use the MySQL monitor to try your queries out to make sure they do what you think they should do, as it will show you your results in an easy-to-read manner and will also give you meaningful error messages if you have slipped up along the way. Secondly, remember that mysqli_query() will return false if the query failed to execute, which means you can test its return value to see whether your SQL statement is faulty. You should be wary of trying to wrap mysqli_query() up inside another function call, because if it returns false due to a bad query, the chances are the parent function will error out. Consider the following code: extract(mysqli_fetch_assoc(mysqli_query($db, "SELECT Blah FROM Blah WHERE Blah = $Blah;"))); Yes, it is perfectly valid SQL and under ideal conditions should work, but what if $Blah is unset? Another possibility is that $Blah might end up being a string - note that there are no quotes around $Blah, which means that if $Blah is a string, MySQL will consider it to be a field name, and the query will likely fail. If the query does fail for some reason, mysqli_fetch_assoc() will fail and output errors, then extract() will fail and output errors, causing a splurge of error messages that likely hinder more than help. Much better is this code: $result = mysqli_query($db, "SELECT Blah FROM Blah WHERE Blah = $Blah;"); if ($result) { extract(mysqli_fetch_assoc($result)); } That is not to say that having all three functions on one line is incorrect - indeed, I use it all the time. However, you should be very sure of any SQL statement you use in that manner, because any mistakes will be very visible to your users. A helpful function for debugging MySQL queries is mysqli_error(), which returns any MySQL errors from the last function call. Each time you call a new MySQL function, the value mysqli_error() is wiped, which means you need to call mysqli_error() as soon as your suspect mysqli_query() has been called, otherwise it might be wiped over by subsequent queries from your connection. Want to learn PHP 7? Hacking with PHP has been fully updated for PHP 7, and is now available as a downloadable PDF. Get over 1200 pages of hands-on PHP learning today! If this was helpful, please take a moment to tell o