Is it possible to update data in my SQL database with Javascript?

Question

I\'m starting to learn some of SQL with javascript and i want to put my variable (\"Val_Points from javascript\") into a table (\"Usuarios\") of a user (ex : Robert). It\'s this

Answer 1

"Standard" approach

foo.php is the site which contains a button and includes a script:

update
...

foo.js adds the on click handler:

$('#update-btn').click(function() {
    $.ajax({
        'url': 'fooHandler.php',
        'method': 'POST',
        'data': {'sid': ..., 'action': 'update', 'value': ...}
        /* 'success': function(data) { ... } */
        /* 'error': function ... */
    });
});

fooHandler.php handles requests to the server from the clients: