how to specify table name in addColumn() function in magento

Question

I am trying to get values from a table but don't know where to specify table name in addColumn() function in magento. Kindly help. Following is the code:

protected function _prepareColumns()
{

    $this->addColumn('orders_count', array(


    'header'    => Mage::helper('sales')->__('Orders'),

    'index'     => 'orders_count',

    'type'      => 'number',

    'total'     => 'sum',

    'sortable'  => false

    ));


}

Answer 1

It looks like your Grid code

Whenever Grid is loading firstly it will load a function "_prepareCollection()" where we collect collection data to show in grid. There we define our resource model(or table).

Example:

protected function _prepareCollection() {
        $collection = Mage::getResourceModel('module/table_collection');
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }