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<?php

namespace {
    /**
     * 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) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
     * @license    http://framework.zend.com/license/new-bsd     New BSD License
     * @version    $Id: Expr.php 23775 2011-03-01 17:25:24Z ralph $
     */
    /**
     * 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) 2005-2011 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;
        }
    }
}