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// fetch read database connection that is used in Mage_Core module
$read= Mage::getSingleton('core/resource')->getConnection('core_read');
$value=$read->query("SE...");
$row = $value->fetch();

print_r($row); // As Array
 
  
// For Write
// fetch write database connection that is used in Mage_Core module
$write = Mage::getSingleton('core/resource')->getConnection('core_write');

// now $write is an instance of Zend_Db_Adapter_Abstract
$write->query("insert into tablename values ('aaa','bbb','ccc')");
 


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