Php Show Sql Error Message
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How To Show Error Message In Php On Same Page
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Sql Error Msg 547
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 http://php.net/manual/en/function.mysql-error.php Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up mysql_error() not displaying an error up vote 5 down vote favorite 1 I am trying to debug my code but mysql_error() isn't displaying anything. I know there is something http://stackoverflow.com/questions/20694550/mysql-error-not-displaying-an-error wrong, because when I write or die("ERROR"); It displays ERROR. So the problem must be with that line of code. When I write or die(mysql_error()); It shows up blank. Here is my code for the line that I think has the error: while ($rows = mysql_fetch_array($sql6) or die(mysql_error())) { Now here is the full code block: $sql6 = mysql_query("SELECT * FROM replies WHERE thread_id = $thread_id"); $numRows = mysql_num_rows($sql6); $replies = ''; if ($numRows < 1) { $replies = "There are no replies yet, you can make the first!"; } else { while ($rows = mysql_fetch_array($sql6) or die(mysql_error())) { $reply_content = $rows['5']; $reply_username = $rows['7']; $reply_date = $rows['8']; $reply_author_id = $rows['4']; $sql9 = mysql_query("SELECT * FROM users WHERE id = '$reply_author_id'"); $numRows = mysql_num_rows($sql9); if ($numRows < 1) { while ($rows = mysql_fetch_array($sql9)) { $reply_user_fn = $rows['first_name']; $reply_user_ln = $rows['last_name']; $reply_user_id = $rows['id']; $reply_user_pp = $rows['profile_pic']; $reply_user_lvl = $rows['user_level']; $reply_user_threads = $rows['threads']; $repl
& Database Submit Sign UP Login × Login Username Password Login Cancel Not a member? Sign Up Forgot Password? Contact Us PHP MySQL query with error printing How to http://www.plus2net.com/php_tutorial/php_mysql_query.php write SQL using PHP to handle the data in MySQL database? In any database driven script we have to update, add, modify, data in the tables. By using PHP we can do all this using http://www.giantflyingsaucer.com/blog/?p=2558 different functions available in PHP. We will start with very basic function, which will execute any query written in sql and can be applied to MySQL database. SQL Structured Query Language or popularly known as SQL sql error is an universal language to handle database. An introduction and different types of sql command like select, insert, update etc you will get in the sql section of this site. There are some advance SQL commands like left join, linking of tables etc to study. If you are not comfortable with SQL any time you can refer the materials in sql section. There are three steps invoved in this process. Connection to error message in database Build the query and execute Display the data First ensure that you have established your mysql connection through PHP. To get the full details on php mysql connection you can read the article here. If you are using PDO then start with PDO connection string here. PHP Functions & SQL Let us start with the function required to execute one query in PHP. Once you have connection established then we can execute sql command by using PHP function mysql_query(). Here is the syntax of the function. Let us first write the query and store in a variable. We will write a query to create table.$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 we will pass this as a parameter to the function like below. $rt=mysql_query($query); The above command will execute the query ( stored in variable $query) and we can check the status of the query ( successful or not ) by checking the status of $rt. $rt will be true of the query is successfully executed or it will return false. We will use p
March 28, 2011 by Chad Lung My recent PHP PDO article introduced you to using PHP PDO. One thing I didn’t cover was how to actually get some error information back from PDO if perhaps you had buggy SQL or something. Let assume I have a simple database called MyDB along with a table called MyTable. Here is a MySQL script for creating the table: CREATE TABLE `MyDB`.`MyTable` ( `id` INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY , `value1` VARCHAR( 20 ) NOT NULL ) ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_general_ci; Perhaps there is a row in there I want to update so I craft my PHP like so: prepare("UPDATE MyTable SET value1 = :value1 WHERE id = :id)"); $id = 100; $value1 = 'Hello World'; $stmt->bindParam(':value1', $value1); $stmt->bindParam(':id', $id); echo($stmt->execute()); } catch(Exception $e) { echo($e->getMessage()); } ?> If you have a sharp eye you will have noticed on the end of my SQL statement I have a bracket which will make the SQL fail. Unfortunately though even with the debugging turned on and a try/catch I won’t know the update failed. I even checked for any return value from the execute function. So, how do I figure out what happened? Well, you can use PDOStatement::errorInfo(). Let me rewrite it now so we get back a message on what went wrong. I’ll add the following line: print_r($stmt->errorInfo()); Here is the full listing: prepare("UPDATE MyTable SET value1 = :value1 WHERE id = :id)"); $id = 100; $value1 = 'Hello World'; $stmt->bindParam(':value1', $value1); $stmt->bindParam(':id', $id); echo($stmt->execute()); print_r($stmt->errorInfo()); } catch(Exception $e) { echo($e->getMessage()); } ?> The output is: Array ( [0] => 42000 [1] => 1064 [2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 ) Ok, so mixed into that we finally find out what went wrong. If you want jus