Integrity constraint violation: 1048 Column 'name' cannot be null error [duplicate]

Question

there were a lot of answers related to this, but I couldn't find useful information. I'm trying to connect to the database and insert user's entered values into it, but I got this error and I seriously don't know what I am doing wrong. I've created 2 different classes in 2 different files, one is connection.php and the other is users.php (for insterting the users into the database) Could someone help me to solve this?

Here is my connection.php file:

<?php

class Connection {
public $dbh;
    // Setting Database Source Name (DSN)
public function __construct() {
$dsn = 'mysql:host=localhost;dbname=employees';
// Setting options
 $options = array (PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
// Making the connection to the database
try {
$this->dbh = new PDO($dsn, 'root', '', $options); 
}
catch (PDOException $e) {
$this->error = $e->getMessage();
        }
    }
}
$connection = new connection();
?>

And here is my users.php file:

<?php
 error_reporting(E_ALL);
ini_set('display_errors', 1);
include 'connection.php';
class Users {
public $name;
public $surname;
public $employmentDate;
public $connection;
public function __construct($connection)
{
$this->connection = $connection;
if(isset($_POST['Submit'])) {
$this->name = $_POST['name'];
$this->surname = $_POST['surname'];
$this->employmentDate = $_POST['employmentDate'];
}
}
// Inserting users values to the database table
public function insertUserValues() {
 $query= 'INSERT INTO employee (name,surname,employment_date)
 VALUES (:name,:surname,:employmentDate)';
 $stmt = $this->connection->dbh->prepare($query);
 $stmt->bindValue(':name',$this->name, PDO::PARAM_STR);
 $stmt->bindValue(':surname',$this->surname, PDO::PARAM_STR);
 $stmt->bindValue(':employmentDate',$this->employmentDate, PDO::PARAM_STR);
 $stmt->execute();
}
}
$users = new Users($connection);
$users->insertUserValues();
?>

I got this error on users.php line 27, which is:

$stmt->execute();

And it says:

Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'name' cannot be null

I know here are a lot of code, but thanks if someone will try to help me...

Answer 1

The error seems quite clear. You have a column in the table that cannot take on a NULL value.

I would speculate that it is not one of the column where you are explicitly providing a value (name, surname, employment_date). You need to look at the definition of the table and look for another column defined as NOT NULL (or perhaps PRIMARY KEY with no default value).

Answer 2

Make sure that the column is marked as Primary key or auto_increment if you are using it that way, or mark it as null if you want to store null.