Mysql Php Error Checking
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and policies of this site About Us Learn more about Stack Overflow mysql_query error the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags i cannot select mysql database 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 http://php.net/manual/en/mysqli.error.php takes a minute: Sign up How to check if a MySQL query using the legacy API was successful? up vote 30 down vote favorite 5 How do I check if a MySQL query is successful other than using die() I'm trying to achieve... mysql_query($query); if(success){ //move file } else if(fail){ //display error } php mysql share|improve this question edited Jun http://stackoverflow.com/questions/11918797/how-to-check-if-a-mysql-query-using-the-legacy-api-was-successful 13 at 8:52 Álvaro González 81.1k20133201 asked Aug 12 '12 at 0:27 JohnSmith 3892921 add a comment| 6 Answers 6 active oldest votes up vote 50 down vote accepted This is the first example in the manual page for mysql_query: $result = mysql_query('SELECT * WHERE 1=1'); if (!$result) { die('Invalid query: ' . mysql_error()); } If you wish to use something other than die, then I'd suggest trigger_error. share|improve this answer edited Aug 12 '12 at 1:01 answered Aug 12 '12 at 0:29 Mark Byers 449k8810941194 3 Or simply if (!mysql_query('SELECT * WHERE 1=1')) { ... } –Rune Aug 12 '12 at 0:32 1 @Rune: Right, but then you won't be able to use the query resource for further actions (i.e. for fetching actual data using mysql_fetch_* functions). –Amal Murali May 21 '14 at 13:36 @AmalMurali hmm, good point. I'm not sure where I was with my head at the time of posting that comment.. –Rune May 22 '14 at 19:44 1 Use $result === false not !$result. REASON: There may be queries for whic
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I see many questions on StackOverflow about database issues. This post aims to provide a checklist to help diagnose common issues. While this post contains PHP and MySQL code samples, this debugging checklist applies to other database platforms. First, debugging is hard. Especially debugging database issues. Often times the best approach is to systematically rule out what cannot be the problem. This checklist adopts such an approach from a low to high level. Can you connect to the database outside your application? Verify you can connect to your database by logging into MySQL from the command line. mysql -u dbuser -p -h localhost database If you have a specific database user for your application, be sure to verify their credentials as well. If you do not have command line access, you can use another database administration tool (e.g. PHPMyAdmin). If you cannot connect to the database, you need to start at the beginning: Ensure MySQL is running, your database exists, and your credentials are correct. Can you connect to the database inside your application? Verify you can connect to the database from PHP. Test with a separate script to also rule out bugs in your codebase: