MySQL: Allow session variables to be set via config. Fixes #3329

classes/kohana/database/mysql.php

@@ -79,6 +79,18 @@ public function connect()
 			// Set the character set
 			$this->set_charset($this->_config['charset']);
 		}
+
+		if ( ! empty($this->_config['connection']['variables']))
+		{
+			// Set session variables
+			foreach ($this->_config['connection']['variables'] as $variable => $value)
+			{
+				mysql_query(
+					'SET SESSION '.$variable.' = '.$this->quote($value),
+					$this->_connection
+				);
+			}
+		}
 	}
 
 	/**

config/database.php

@@ -14,6 +14,7 @@
 			 * string   username     database username
 			 * string   password     database password
 			 * boolean  persistent   use persistent connections?
+			 * array    variables    system variables as "key => value" pairs
 			 *
 			 * Ports and sockets may be appended to the hostname.
 			 */