phpmyadmin not using DEFAULT value when input is left empty - php

Question

I have this problem where if I leave my input for 'Title' blank, then it won't set the default value: "Untitled" when sent to the database. I've looked online and have made sure that my settings were correct in phpmyadmin but it still won't set the default value. Any piece of advice is appreciated!
Here are my PHPmyadmin settings for the "Title" column:
These are my files:
addart.php
<form method="post" action="addtodb.php">
<label for="Title">
<h4>Title</h4>
</label>
<input class="u-full-width"
type="text"
placeholder="Title of art"
id="Title"
name="Title">
</form>
addtodb.php
<?php
if($_SERVER['REQUEST_METHOD'] == "POST") {
$host = 'localhost';
$user = 'root';
$pass = '';
$db = 'testdb';
$dbConnection = new mysqli($host, $user, $pass, $db);
if (mysqli_connect_errno()) {
printf("Could not connect to the mySQL database: %s\n", mysqli_connect_error());
exit();
}
if($_POST) {
$artwork = $_POST["Artwork"];
$medium = $_POST["Medium"];
$artist = $_POST["Artist"];
$title = $_POST["Title"];
$results = $dbConnection->query("INSERT INTO art
(Artwork, Title, Artist, Medium) VALUES
('$artwork','$title','$artist','$medium');");
if (!$results) {
echo 'Unable to insert into database.';
exit();
} else {
echo 'Successfully added!';
}
mysqli_close($dbConnection);
header("Location: galleryonly.php"); /* Redirect browser */
exit();
}
?>

Answer 1

$artwork = $_POST["Artwork"];
$medium = $_POST["Medium"];
$artist = $_POST["Artist"];
$title = $_POST["Title"];
if(!empty($title)) {
$sql = "INSERT INTO art (Artwork, Title, Artist, Medium) VALUES ('$artwork', '$title', '$artist', '$medium')";
} else {
$sql = "INSERT INTO art (Artwork, Artist, Medium) VALUES ('$artwork', '$artist', '$medium')";
}
$results = $dbConnection->query($sql);
You can try out this code.
If you're omitting the column, the default value will be set.
Because you have only one column with default value, you can stick with this code.
If you have more than one column with default value, you will need to make changes according to your requirements.

Answer 2

You have a bit of trick ahead of you, because you won't be able to use the Title column if you need the Default value.
// assuming use of proper method of sanitizing
// these values so we don't get SQL INJECTED!!
$artwork = 'artwork';
$title = 'title';
$artist = 'artist';
$medium = 'medium';
// make an array with the columns
$cols = explode(',', 'Artwork,Title,Artist,Medium');
// make an array with the values (that you sanitized properly!)
$vars = explode(',', 'artwork,title,artist,medium');
foreach ($cols as $i=>&$col) {
$var = ${$vars[$i]};
if ($col == 'Title') {
if (empty($var)) {
// don't add this column if empty
continue;
}
}
// otherwise (if not Title)
// add it to a column = "value" insert string
$pcs[] = "`$col` = '$var'";
}
// fortunately, we can insert with update syntax, too!
$query = 'insert into art set ';
$query .= implode(', ', $pcs);

Answer 3

use always small letters in
<input class="u-full-width"
type="text"
placeholder="Title of art"
id="Title"
name="title">