在SQL Server的try...catch语句中获取错误消息的代码

BEGIN TRY
...
...
END TRY
BEGIN CATCH
DECLARE @ErrorMessage NVARCHAR(4000);
DECLARE @ErrorSeverity INT;
DECLARE @ErrorState INT;

SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();

RAISERROR (@ErrorMessage,  -- Message text.
@ErrorSeverity, -- Severity.
@ErrorState     -- State.
);
END CATCH;