wordpress run php file in form action - php

Question

I am trying to re-do my site to wordpress, I have this problem. I have a form and on a submit php file runs and adds data to database. How do I run php file in wordpress?
<form method="POST" action="insert.php">
<p>
<label for="XX">XX</label>
<input type="text" name="XX" id="XX">
<label for="X">X</label>
<input type="text" name="X" id="X">
<label for="XXY">XXY</label>
<input type="text" name="XXY" id="XXY">
</p>
<input type="submit" value="add to database">
</form>
How do I run the php insert.php file? Thank you!
Or on the other hand, could I write in action the directory to the file? eg. wp-content/myphpfiles/insertgolf.php, would that work? Thank you, I am new to wordpress

Answer 1

In WordPress form page, you can not put php file path. If you want to do this then you need to create a template.
Please follow reference link, here you can know how to create template in WordPress: https://www.cloudways.com/blog/creating-custom-page-template-in-wordpress/
In template file put your code:
<?php /* Template Name: insertGolf */
if(!empty($_POST) && $_SERVER['REQUEST_METHOD'] == 'POST'){
//do database related code here
$link = mysqli_connect("c108um.DDD.com","f96860","qt3C2EQ","f96860");
if($link === false){
die("ERROR: " . mysqli_connect_error());
}
$datum = mysqli_real_escape_string($link, $_REQUEST['datum']);
$odkud = mysqli_real_escape_string($link, $_REQUEST['odkud']);
$sql = "INSERT INTO golf (datum, odkud) VALUES ('$datum', '$odkud')";
if(mysqli_query($link, $sql)){ header('Location: golf.php');
exit;
}
else{
echo "ERROR: " . mysqli_error($link);
}
mysqli_close($link);
}
?>
<form method="POST" action="">
<p>
<label for="XX">XX</label>
<input type="text" name="XX" id="XX">
<label for="X">X</label>
<input type="text" name="X" id="X">
<label for="XXY">XXY</label>
<input type="text" name="XXY" id="XXY">
</p>
<input type="submit" value="add to database">
</form>