Exception.php

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<?php
#require_once 'Zend/Db/Exception.php';

class Zend_Db_Adapter_Exception extends Zend_Db_Exception
{
    protected $_chainedException = null;

    public function __construct($message = '', $code = 0, Exception $e = null)
    {
        if ($e && (0 === $code)) {
            $code = $e->getCode();
        }
        parent::__construct($message, $code, $e);
    }

    public function hasChainedException()
    {
        return ($this->getPrevious() !== null);
    }

    public function getChainedException()
    {
        return $this->getPrevious();
    }

}