How do keep custom value on ps_product when update quantity in admin

[phinq1910]

Hello,

 

I am learning to create prestashop module. I have 2 questions:

 

1/ When my module install, I have added 1 column (`design_product_downloadable`: refer image image attached) on ps_product table. After when I update Quantity in Quantities tab of Admin Panel/Catalog/Products, value of `design_product_downloadable` auto reset value. I dont know why?

So, how do i can keep value of `design_product_downloadable`?

 

2/ I want to display custom information same green region of attacted file, but i dont know how to do it. Please help me!

 

I am using Prestashop 1.6.1.5

Please give me some idea.

 

Thank you

Edited May 16, 2016 by phinq1910 (see edit history)

[Mr.SerikuS]

Hi.

 

If you want make it as module - i cant help you

 

But you can make it through PHP/MySQL Classes, directly modifing some PS files.