1 files changed, 16 insertions, 8 deletions
diff --git a/framework/Data/Common/TDbTableInfo.php b/framework/Data/Common/TDbTableInfo.php
index e2aae3d0..455dbc33 100644
--- a/framework/Data/Common/TDbTableInfo.php
+++ b/framework/Data/Common/TDbTableInfo.php
@@ -27,7 +27,13 @@ class TDbTableInfo extends TComponent
 
 	private $_columns;
 
-	private $_lowercase;
+	private $_lowercase;
+
+	/**
+	 * @var null|array
+	 * @since 3.1.7
+	 */
+	private $_names = null;
 
 	/**
 	 * Sets the database table meta data information.
@@ -118,11 +124,14 @@ class TDbTableInfo extends TComponent
 	 * @return array table column names (identifier quoted)
 	 */
 	public function getColumnNames()
-	{
-		$names=array();
-		foreach($this->getColumns() as $column)
-			$names[] = $column->getColumnName();
-		return $names;
+	{
+		if($this->_names===null)
+		{
+			$this->_names=array();
+			foreach($this->getColumns() as $column)
+				$this->_names[] = $column->getColumnName();
+		}
+		return $this->_names;
 	}
 
 	/**
@@ -154,5 +163,4 @@ class TDbTableInfo extends TComponent
 		}
 		return $this->_lowercase;
 	}
-}
-
+}
+\ No newline at end of file