在SQL Server的try...catch语句中获取错误消息代码的的语句

代码如下:

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;