Product customization text area maxlength

[Engraved Heaven]

I am running an engraving service and my products have options to customize them.
Every item has different length of message. I need to maximize the message length.
 
My idea is the following:
 
I added this (maxlength="30") to themes/default..../product.tpl and it works fine:

<textarea name="textField{$field.id_customization_field}" class="form-control customization_block_input" id="textField{$customizationField}" rows="3" cols="20" maxlength="30">{strip}

So...

I want to create a new column in product table  like eg. message_max_length

 

I need a SQL query in product.php which call message1 column and insert that string into above line (maxlength="$message_max_length") in product.tpl 

 

Thank You

Regards

Gabriel

 

Engraved Heaven