Wenn Sie einen Try / Catch-Block verwenden, führt eine Raiserror-Fehlernummer mit dem Schweregrad 11-19 dazu, dass die Ausführung zum Catch-Block springt.
Jeder Schweregrad über 16 ist ein Systemfehler. Um den folgenden Code zu demonstrieren, wird ein Try / Catch-Block eingerichtet und eine gespeicherte Prozedur ausgeführt, von der wir annehmen, dass sie fehlschlägt:
Angenommen, wir haben eine Tabelle [dbo]. [Fehler], um Fehler zu speichern. Angenommen, wir haben eine gespeicherte Prozedur [dbo]. [AssumeThisFails], die fehlschlägt, wenn wir sie ausführen
-- first lets build a temporary table to hold errors
if (object_id('tempdb..#RAISERRORS') is null)
create table #RAISERRORS (ErrorNumber int, ErrorMessage varchar(400), ErrorSeverity int, ErrorState int, ErrorLine int, ErrorProcedure varchar(128));
-- this will determine if the transaction level of the query to programatically determine if we need to begin a new transaction or create a save point to rollback to
declare @tc as int;
set @tc = @@trancount;
if (@tc = 0)
begin transaction;
else
save transaction myTransaction;
-- the code in the try block will be executed
begin try
declare @return_value = '0';
set @return_value = '0';
declare
@ErrorNumber as int,
@ErrorMessage as varchar(400),
@ErrorSeverity as int,
@ErrorState as int,
@ErrorLine as int,
@ErrorProcedure as varchar(128);
-- assume that this procedure fails...
exec @return_value = [dbo].[AssumeThisFails]
if (@return_value <> 0)
raiserror('This is my error message', 17, 1);
-- the error severity of 17 will be considered a system error execution of this query will skip the following statements and resume at the begin catch block
if (@tc = 0)
commit transaction;
return(0);
end try
-- the code in the catch block will be executed on raiserror("message", 17, 1)
begin catch
select
@ErrorNumber = ERROR_NUMBER(),
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE(),
@ErrorLine = ERROR_LINE(),
@ErrorProcedure = ERROR_PROCEDURE();
insert #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
values (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
-- if i started the transaction
if (@tc = 0)
begin
if (XACT_STATE() <> 0)
begin
select * from #RAISERRORS;
rollback transaction;
insert into [dbo].[Errors] (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
select * from #RAISERRORS;
insert [dbo].[Errors] (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
values (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
return(1);
end
end
-- if i didn't start the transaction
if (XACT_STATE() = 1)
begin
rollback transaction myTransaction;
if (object_id('tempdb..#RAISERRORS') is not null)
insert #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
values (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
else
raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
return(2);
end
else if (XACT_STATE() = -1)
begin
rollback transaction;
if (object_id('tempdb..#RAISERRORS') is not null)
insert #RAISERRORS (ErrorNumber, ErrorMessage, ErrorSeverity, ErrorState, ErrorLine, ErrorProcedure)
values (@ErrorNumber, @ErrorMessage, @ErrorSeverity, @ErrorState, @ErrorLine, @ErrorProcedure);
else
raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
return(3);
end
end catch
end
RAISERROR
wird tatsächlich die Ausführung beenden, wenn der Schweregrad auf 17 oder 18 anstatt auf 16 eingestellt ist.