diff --git a/framework/yii/db/TableSchema.php b/framework/yii/db/TableSchema.php
index d599388..910061d 100644
--- a/framework/yii/db/TableSchema.php
+++ b/framework/yii/db/TableSchema.php
@@ -21,12 +21,6 @@ use yii\base\InvalidParamException;
 class TableSchema extends Object
 {
 	/**
-	 * @var string name of the catalog (database) that this table belongs to.
-	 * Defaults to null, meaning no catalog (or the current database).
-	 * This property is only meaningful for MSSQL.
-	 */
-	public $catalogName;
-	/**
 	 * @var string name of the schema that this table belongs to.
 	 */
 	public $schemaName;
diff --git a/framework/yii/db/mssql/Schema.php b/framework/yii/db/mssql/Schema.php
index ad0f7d4..4048fe2 100644
--- a/framework/yii/db/mssql/Schema.php
+++ b/framework/yii/db/mssql/Schema.php
@@ -7,7 +7,7 @@
 
 namespace yii\db\mssql;
 
-use yii\db\TableSchema;
+use yii\db\mssql\TableSchema;
 use yii\db\ColumnSchema;
 
 /**
diff --git a/framework/yii/db/mssql/TableSchema.php b/framework/yii/db/mssql/TableSchema.php
new file mode 100644
index 0000000..67ad85c
--- /dev/null
+++ b/framework/yii/db/mssql/TableSchema.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2011 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\mssql;
+
+/**
+ * TableSchema represents the metadata of a database table.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class TableSchema extends \yii\db\TableSchema
+{
+	/**
+	 * @var string name of the catalog (database) that this table belongs to.
+	 * Defaults to null, meaning no catalog (or the current database).
+	 */
+	public $catalogName;
+}