Primilary import of new db stuff

1 files changed, 49 insertions, 0 deletions

diff --git a/framework/Db/schema/TDbExpression.php b/framework/Db/schema/TDbExpression.php
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+<?php
+/**
+ * TDbExpression class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * TDbExpression represents a DB expression that does not need escaping.
+ * TDbExpression is mainly used in {@link CActiveRecord} as attribute values.
+ * When inserting or updating a {@link CActiveRecord}, attribute values of
+ * type TDbExpression will be directly put into the corresponding SQL statement
+ * without escaping. A typical usage is that an attribute is set with 'NOW()'
+ * expression so that saving the record would fill the corresponding column
+ * with the current DB server timestamp.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package system.db.schema
+ * @since 1.0.2
+ */
+class TDbExpression extends TComponent
+{
+	/**
+	 * @var string the DB expression
+	 */
+	public $expression;
+
+	/**
+	 * Constructor.
+	 * @param string the DB expression
+	 */
+	public function __construct($expression)
+	{
+		$this->expression=$expression;
+	}
+
+	/**
+	 * String magic method
+	 * @return string the DB expression
+	 */
+	public function __toString()
+	{
+		return $this->expression;
+	}
+}
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