Php Check Mysql Error
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Or Die Mysql Error
this question edited Jun 13 at 8:52 Álvaro González 81.2k20133201 asked Aug 12 '12 at 0:27 JohnSmith 3872921 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 449k8810961194 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 $result === fals
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Mysql_query Error
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& Database Submit Sign UP Login × Login Username Password Login Cancel Not a member? Sign Up Forgot Password? Contact Us http://www.plus2net.com/php_tutorial/php_mysql_query.php PHP MySQL query with error printing How to write SQL using PHP to handle the data in MySQL database? In any database driven script we have to update, http://www.hackingwithphp.com/19/8/6/handling-mysql-errors add, modify, data in the tables. By using PHP we can do all this using different functions available in PHP. We will start with very basic function, which will execute mysql error any query written in sql and can be applied to MySQL database. SQL Structured Query Language or popularly known as SQL is an universal language to handle database. An introduction and different types of sql command like select, insert, update etc you will get in the sql section of this site. There are some advance SQL commands like left join, linking php check mysql of tables etc to study. If you are not comfortable with SQL any time you can refer the materials in sql section. There are three steps invoved in this process. Connection to database Build the query and execute Display the data First ensure that you have established your mysql connection through PHP. To get the full details on php mysql connection you can read the article here. If you are using PDO then start with PDO connection string here. PHP Functions & SQL Let us start with the function required to execute one query in PHP. Once you have connection established then we can execute sql command by using PHP function mysql_query(). Here is the syntax of the function. Let us first write the query and store in a variable. We will write a query to create table.$query="CREATE TABLE student ( id int(2) NOT NULL auto_increment, name varchar(50) NOT NULL default '', class varchar(10) NOT NULL default '', mark int(3) NOT NULL default '0', PRIMARY KEY (id) ) TYPE=MyISAM"; We have stored the sql create query in a variable $query and
to fix than pure PHP problems because you can narrow down the position of the error very easily, then analyse the faulty SQL line to spot the problem. There are several ways to debug your SQL usage: Firstly, always check your code is actually correct - use the MySQL monitor to try your queries out to make sure they do what you think they should do, as it will show you your results in an easy-to-read manner and will also give you meaningful error messages if you have slipped up along the way. Secondly, remember that mysqli_query() will return false if the query failed to execute, which means you can test its return value to see whether your SQL statement is faulty. You should be wary of trying to wrap mysqli_query() up inside another function call, because if it returns false due to a bad query, the chances are the parent function will error out. Consider the following code: extract(mysqli_fetch_assoc(mysqli_query($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