Additional tabs in product page

[MLipski]

Hello,

I added to product page an input field and I added a column to ps_product in database, but I don't have any idea to save the value of this input to database.
Where I can do the SQL query to add this value to databse?

I added a form by views/templates/hook/

<div class="m-b-1 m-t-1">
    <fieldset class="form-group">

        <div class="col-lg-12 col-xl-4">
            <label class="form-control-label">{l s='Przykladowe pole' mod='dodatkoweZakladki'}</label>
            <input class="form-control" name="custom_field" type="text">
        </div>

    </fieldset>
    <div class="clearfix"></div>
</div>

I'll be grateful for any responce.