how to insert form values to mysql with PDO [duplicate] - php

Question

This question already has answers here:
Reference — frequently asked questions about PDO
(3 answers)
Closed 9 years ago.
I'm trying to insert values to mysql database, but for some reason this is not working. I can get it to work with normal PHP but I have been told that PDO would be safer to use. This is the code I use, the values are posted to the php file, but not updated to mysql. What could be the reason for that?
<?php
include 'config.php';
// database connection
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass);
// new data
$value1 = $_POST["value1"];
$value2 = $_POST["value2"];
$value3 = $_POST["value3"];
$value4 = $_POST["value4"];
// query
$sql = "INSERT INTO `database`.`table`
(`id`, `value1`, `value2`, `value3`, `value4`, `timeStamp`)
VALUES (NULL, ?, ?, ?, ?, CURRENT_TIMESTAMP)";
$q = $conn->prepare($sql);
$q->execute(array($value1, $value2, $value3, $value4));
?>

Answer 1

Change this line
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass);
to this
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
and use try catch on
try
{
$q->execute(array($value1, $value2, $value3, $value4));
}
catch(Exception $e)
{
echo $e->getMessage();
//other code to handle exception for example logging, rollback transaction if exists etc.
}
When you make these changes then PDO Exceptions will be thrown and you will see what problem is. With PDO exception you can do more to handle error, for example if you use transactions then you can in catch block rollback it.
You can use error_reporting(E_ALL); and display_errors with ini_set().
You can also use PDO::errorInfo
From manual:
PDO::errorInfo — Fetch extended error information associated with the last operation on the database handle
To see examples check this link
Check these links:
how to set display errors
info about exceptions
pdo exception