Added transaction method to database connection and eloquent model.

laravel/database/connection.php

@@ -84,6 +84,33 @@ class Connection {
 		}
 	}
 
+	/**
+	 * Execute a callback wrapped in a database transaction.
+	 *
+	 * @param  Closure  $callback
+	 * @return void
+	 */
+	public function transaction($callback)
+	{
+		$this->pdo->beginTransaction();
+
+		// After beginning the database transaction, we will call the Closure
+		// so that it can do its database work. If an exception occurs we'll
+		// rollback the transaction and re-throw back to the developer.
+		try
+		{
+			call_user_func($callback);
+		}
+		catch (\Exception $e)
+		{
+			$this->pdo->rollBack();
+
+			throw $e;
+		}
+
+		$this->pdo->commit();
+	}
+
 	/**
 	 * Execute a SQL query against the connection and return a single column result.
 	 *