Added new (clean) yii boilerplate

framework/db/schema/CDbExpression.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * CDbExpression class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright 2008-2013 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CDbExpression represents a DB expression that does not need escaping.
+ * CDbExpression is mainly used in {@link CActiveRecord} as attribute values.
+ * When inserting or updating a {@link CActiveRecord}, attribute values of
+ * type CDbExpression 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.
+ *
+ * Starting from version 1.1.1, one can also specify parameters to be bound
+ * for the expression. For example, if the expression is 'LOWER(:value)', then
+ * one can set {@link params} to be <code>array(':value'=>$value)</code>.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package system.db.schema
+ */
+class CDbExpression extends CComponent
+{
+	/**
+	 * @var string the DB expression
+	 */
+	public $expression;
+	/**
+	 * @var array list of parameters that should be bound for this expression.
+	 * The keys are placeholders appearing in {@link expression}, while the values
+	 * are the corresponding parameter values.
+	 * @since 1.1.1
+	 */
+	public $params=array();
+
+	/**
+	 * Constructor.
+	 * @param string $expression the DB expression
+	 * @param array $params parameters
+	 */
+	public function __construct($expression,$params=array())
+	{
+		$this->expression=$expression;
+		$this->params=$params;
+	}
+
+	/**
+	 * String magic method
+	 * @return string the DB expression
+	 */
+	public function __toString()
+	{
+		return $this->expression;
+	}
+}