Getting A Database Adapter (Read or Write)
To read:
Mage::getSingleton('core/resource')->getConnection('core_read');
To write:
Mage::getSingleton('core/resource')->getConnection('core_write');
To read:
Mage::getSingleton('core/resource')->getConnection('core_read');
To write:
Mage::getSingleton('core/resource')->getConnection('core_write');