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Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up how to display MySql error in php up vote 14 down http://php.net/manual/en/function.mysql-error.php vote favorite In PHP, I am trying to execute a long MySql query that depends on the user input. However, my query fails with the following message, "Query Failed". Actually I have printed this message whenever the query fails but I am having hard time looking for the reason behind this failure. Unfortunately, I couldn't find it because the error is not specified on the web page. My question http://stackoverflow.com/questions/12227626/how-to-display-mysql-error-in-php is, is there any way to display the error message that caused the failure on the web page. Thank you. Here's my code, $from= "Findings"; $where=""; if($service!= null) { $from = $from . ", ServiceType_Lookup"; $where= "Findings.ServiceType_ID= ServiceType_Lookup.ServiceType_ID AND ServiceType_Name= ". $service; if($keyword!= null) $where= $where . " AND "; } if( $keyword != null) { $where= $where . "Finding_ID LIKE '%$keyword%' OR ServiceType_ID LIKE '%$keyword%' OR Title LIKE '%$keyword%' OR RootCause_ID LIKE '%$keyword%' OR RiskRating_ID LIKE '%$keyword%' OR Impact_ID LIKE '%$keyword%' OR Efforts_ID LIKE '%$keyword%' OR Likelihood_ID LIKE '%$keyword%' OR Finding LIKE '%$keyword%' OR Implication LIKE '%$keyword%' OR Recommendation LIKE '%$keyword%' OR Report_ID LIKE '%$keyword%'"; } $query = "SELECT Finding_ID, ServiceType_ID, Title, RootCause_ID, RiskRating_ID, Impact_ID, Efforts_ID, Likelihood_ID, Finding, Implication, Recommendation, Report_ID FROM ".$from . " WHERE " . $where; echo "wala 2eshiq"; $this->result = $this->db_link->query($query); if (!$this->result) { printf("Query failed: %s\n", mysqli_connect_error()); exit; } $r = mysqli_query($this->db_link, $query); if($r==false) printf("error: %s\n", mysqli_errno($this->db_link)); php mysql share|improve this question asked Sep 1 '12 at 12:16 Traveling Salesman 56131640 You can just use: $this->db_link->error to get the last error message. For all errors use $this->db_link->error_list. –hakre Sep 1 '12 at 12:31 add a comment| 7 Answers 7 active oldest votes up vote 17 down v
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Login Cancel Not a member? Sign Up Forgot Password? Contact Us Error message displaying after execution of a query We can display error message in case of an error generated by mysql query. This meaning full error message gives idea one the problem or bugs in the script. We can print the error message by using mysql function mysql_error(). This function returns the error message associated with most recently executed query. So it is a good idea to check for error before going to next query. We can even add the error number returned by mysql to this error message. This way we can generate a meaningful detail on the bugs on the script. MySQL Error MySQL Error No Error Message Error Mail $querry = mysql_query("SELECT new_field FROM student"); echo "Error message = ".mysql_error(); In our student table there is no field as new_field. Here here is the message we will get Error message = Unknown column 'new_field' in 'field list' Note that mysql_error() is deprecated as of PHP 5.5.0 so better to avoid using this function. So if you are using PDO then we can use errorInfo() to display the returned error message from MySQL Here is a sample code in PHP using PDO to display record and on failure to display error message. require 'config-pdo.php'; // database connection string $pdo=$dbo->prepare('Select no_name from student'); if($pdo->execute()){ echo 'Success
'; $row = $pdo->fetch(PDO::FETCH_OBJ); echo "Name : $row->name "; }else{ print_r($pdo->errorInfo()); } In the above code there is an error in sql , there is no column by name no_name. The output will be Array ( [0] => 42S22 [1] => 1054 [2] => Unknown column 'no_name' in 'field list' ) So to get correct result change the sql part like this . $pdo=$dbo->prepare('Select * from student'); With this you will get desired output. Handling PDO errors If such error occurs what is to be done ? We have