Php Error Handling Database
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Php Pdo Execute Error
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Php Pdo Try Catch
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Join them; it only takes a minute: Sign up Handling DB error in PHP up vote 1 down vote favorite Hey everyone! I'm building a webapp in PHP that uses a MySql DB. What I error handling want to do is for example when someone tries to access to a page, but the DB throws an error, to display a HTML (or redirect) page with the HTTP code 500. Something like the "fail whale" in Twitter. Is that possible? php mysql database error-handling share|improve this question asked Oct 26 '10 at 16:40 Francesc 68631229 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted You could use the pdo execute error die function in PHP to do this like so. mysql_connect("details go here")or die(require("failed.php")); That will attempt to connect to your database and if it fails will require another file, you could also create a function that redirects users and stick that inside the die() function and simply redirect them to another page, either way that's how you would send users away upon an error with the connection. share|improve this answer edited Oct 26 '10 at 16:48 cwallenpoole 45.5k1275118 answered Oct 26 '10 at 16:46 Tom Walters 9,28343057 But If I do this, and the failed.php has the header("Location /path/to/anything"); it outputs "Cannot modify header information - headers already sent" –Francesc Oct 26 '10 at 16:59 Well you could redirect using JavaScript or a meta tag instead, so put a function name inside the brackets and then do the following - function redirect(){ echo '' } –Tom Walters Oct 26 '10 at 17:01 at first output php generates headers and sends them to the client. if ou make any output and afterwards try to do a header() then you will get the error you just got –ITroubs Oct 26 '10 at 17:10 add a comment| up vote 0 down vote If there is an error in mysql it will return FALSE instead of a resource. You can then do 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 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 them; it only takes a minute: Sign up PHP MySQL error handling up vote 2 down vote 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 this question edited Aug 28 '13 at 20:11 hdvianna 337211 asked Nov 8 '10 at 16:04 lethalMango 2,23583773 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 27.3k45593 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\nPdo Error 00000
Pdo Execute Error Handling
$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 really: You should NEVER use mysql_query or functions which call it(Such as the one I just wrote). It is far too unsafe to ever be used. (Far too difficult to avoid sql injections) Use the pdo classes instead of the mysql_ method