Add a column to quote item table

Question

I want to add a column to the sales_flat_quote_item (and ..._order_item) table through an install script, but when I go to the table sales_flat_quote_item (or ..._order_item) in my database - the column is not there.

The install script's version is 0.0.1. My config.xml is also 0.0.1.

I have cleared the cache. I refreshed the back-end, so the script has ran.

Any clues?

$installer = $this;
$installer->startSetup();
$installer->getConnection()->addColumn($installer->getTable('sales/quote_item'), 'print_sku', "varchar NOT NULL");
$installer->getConnection()->addColumn($installer->getTable('sales/order_item'), 'print_sku', "varchar NOT NULL");
$installer->endSetup();

Answer 1

In order to add column to sales_flat_quote_item you will have to write an upgrade script for that follow below steps.

1. Create a module or use your existing custom module.

2. Modify your config.xml to add a setup resource with class Mage_Sales_Model_Resource_Setup:

   <global>
       <resources>
           <your_module_setup>
               <setup>
                   <module>Your_Module</module>
                   <class>Mage_Sales_Model_Resource_Setup</class>
               </setup>
          </your_module_setup>
        </resources>
    </global>
   

3. Create a directory data/your_module_setup in your module

4. Create a data-install or data-upgrade script containing the following code:

   $installer = $this;
   
   $installer->startSetup();
   
   $installer->addAttribute(
       'quote_item',  /* order, quote, order_item, quote_item */
       'your_attribute_code', 
       array(
           'type' => 'varchar', /* int, varchar, text, decimal, datetime */
           'nullable' => false, /* default true */
           'grid' => false, /* or true if you wan't use this attribute on orders grid page */
       )
   );
   
   $installer->endSetup();