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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Expr
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * Class for SQL SELECT fragments.
  *
  * This class simply holds a string, so that fragments of SQL statements can be
  * distinguished from identifiers and values that should be implicitly quoted
  * when interpolated into SQL statements.
  *
  * For example, when specifying a primary key value when inserting into a new
  * row, some RDBMS brands may require you to use an expression to generate the
  * new value of a sequence.  If this expression is treated as an identifier,
  * it will be quoted and the expression will not be evaluated.  Another example
  * is that you can use Zend_Db_Expr in the Zend_Db_Select::order() method to
  * order by an expression instead of simply a column name.
  *
  * The way this works is that in each context in which a column name can be
  * specified to methods of Zend_Db classes, if the value is an instance of
  * Zend_Db_Expr instead of a plain string, then the expression is not quoted.
  * If it is a plain string, it is assumed to be a plain column name.
  *
  * @category   Zend
  * @package    Zend_Db
  * @subpackage Expr
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Db_Expr
 {
     /**
      * Storage for the SQL expression.
      *
      * @var string
      */
     protected $_expression;
 
     /**
      * Instantiate an expression, which is just a string stored as
      * an instance member variable.
      *
      * @param string $expression The string containing a SQL expression.
      */
     public function __construct($expression)
     {
         $this->_expression = (string) $expression;
     }
 
     /**
      * @return string The string of the SQL expression stored in this object.
      */
     public function __toString()
     {
         return $this->_expression;
     }
 
 }