Adapter
6 months ago
Profiler
2 years ago
Select
2 years ago
Statement
6 months ago
Table
1 year ago
Exception.php
2 years ago
Expr.php
2 years ago
Profiler.php
1 month ago
Select.php
2 years ago
Statement.php
1 year ago
Table.php
2 years ago
Expr.php
76 lines
| 1 | <?php |
| 2 | |
| 3 | namespace { |
| 4 | /** |
| 5 | * Zend Framework |
| 6 | * |
| 7 | * LICENSE |
| 8 | * |
| 9 | * This source file is subject to the new BSD license that is bundled |
| 10 | * with this package in the file LICENSE.txt. |
| 11 | * It is also available through the world-wide-web at this URL: |
| 12 | * http://framework.zend.com/license/new-bsd |
| 13 | * If you did not receive a copy of the license and are unable to |
| 14 | * obtain it through the world-wide-web, please send an email |
| 15 | * to license@zend.com so we can send you a copy immediately. |
| 16 | * |
| 17 | * @category Zend |
| 18 | * @package Zend_Db |
| 19 | * @subpackage Expr |
| 20 | * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) |
| 21 | * @license http://framework.zend.com/license/new-bsd New BSD License |
| 22 | * @version $Id: Expr.php 23775 2011-03-01 17:25:24Z ralph $ |
| 23 | */ |
| 24 | /** |
| 25 | * Class for SQL SELECT fragments. |
| 26 | * |
| 27 | * This class simply holds a string, so that fragments of SQL statements can be |
| 28 | * distinguished from identifiers and values that should be implicitly quoted |
| 29 | * when interpolated into SQL statements. |
| 30 | * |
| 31 | * For example, when specifying a primary key value when inserting into a new |
| 32 | * row, some RDBMS brands may require you to use an expression to generate the |
| 33 | * new value of a sequence. If this expression is treated as an identifier, |
| 34 | * it will be quoted and the expression will not be evaluated. Another example |
| 35 | * is that you can use Zend_Db_Expr in the Zend_Db_Select::order() method to |
| 36 | * order by an expression instead of simply a column name. |
| 37 | * |
| 38 | * The way this works is that in each context in which a column name can be |
| 39 | * specified to methods of Zend_Db classes, if the value is an instance of |
| 40 | * Zend_Db_Expr instead of a plain string, then the expression is not quoted. |
| 41 | * If it is a plain string, it is assumed to be a plain column name. |
| 42 | * |
| 43 | * @category Zend |
| 44 | * @package Zend_Db |
| 45 | * @subpackage Expr |
| 46 | * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) |
| 47 | * @license http://framework.zend.com/license/new-bsd New BSD License |
| 48 | */ |
| 49 | class Zend_Db_Expr |
| 50 | { |
| 51 | /** |
| 52 | * Storage for the SQL expression. |
| 53 | * |
| 54 | * @var string |
| 55 | */ |
| 56 | protected $_expression; |
| 57 | /** |
| 58 | * Instantiate an expression, which is just a string stored as |
| 59 | * an instance member variable. |
| 60 | * |
| 61 | * @param string $expression The string containing a SQL expression. |
| 62 | */ |
| 63 | public function __construct($expression) |
| 64 | { |
| 65 | $this->_expression = (string) $expression; |
| 66 | } |
| 67 | /** |
| 68 | * @return string The string of the SQL expression stored in this object. |
| 69 | */ |
| 70 | public function __toString() |
| 71 | { |
| 72 | return $this->_expression; |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 |