CREATE PROCEDURE dbo.sp_helpdiagrams
	(
		@diagramname sysname = NULL,
		@owner_id int = NULL
	)
	WITH EXECUTE AS N'dbo'
	AS
	BEGIN
		DECLARE @user sysname
		DECLARE @dboLogin bit
		EXECUTE AS CALLER;
			SET @user = USER_NAME();
			SET @dboLogin = CONVERT(bit,IS_MEMBER('db_owner'));
		REVERT;
		SELECT
			[Database] = DB_NAME(),
			[Name] = name,
			[ID] = diagram_id,
			[Owner] = USER_NAME(principal_id),
			[OwnerID] = principal_id
		FROM
			sysdiagrams
		WHERE
			(@dboLogin = 1 OR USER_NAME(principal_id) = @user) AND
			(@diagramname IS NULL OR name = @diagramname) AND
			(@owner_id IS NULL OR principal_id = @owner_id)
		ORDER BY
			4, 5, 1
	END