try catch doesn't work correct T-SQL - sql-server

Question

I would like to ask why (try catch) doesn't work correct because when is error in person 2 trigger showed problem. Don`t ask about different between table person and table person 2 this is only example to show problem.
CREATE TRIGGER Example
ON Person
after INSERT
AS
BEGIN TRY
INSERT INTO [Person2]
SELECT
inserted.Name,
inserted.Surname,
inserted.Age,
inserted.Street
FROM inserted
END TRY
BEGIN CATCH
END CATCH
Insert working correct if trigger is delated
INSERT INTO Person
Values
('Jhon', 'Kowalsky', '12', null)
error
(0 row(s) affected)
Msg 3616, Level 16, State 1, Line 1 An error was raised during trigger
execution. The batch has been aborted and the user transaction, if
any, has been rolled back.
table Person - here you can see one difference between person and person 2 Street allow nulls
table Person 2 - here you can see one difference between person and person 2 Street doesn't allow nulls

Answer 1

Try this one -
CREATE TRIGGER dbo.Example
ON dbo.Person
AFTER INSERT
AS
BEGIN
SET NOCOUNT ON
SET XACT_ABORT ON
DECLARE #OwnTran BIT
SET #OwnTran = 0
IF ##TRANCOUNT = 0
BEGIN
SET #OwnTran = 1
BEGIN TRAN
END
BEGIN TRY
INSERT INTO dbo.Person2 (Name, Surname, Age, Street)
SELECT
i.Name
, i.Surname
, i.Age
, i.Street
FROM INSERTED i
END TRY
BEGIN CATCH
DECLARE #em NVARCHAR(MAX), #sev INT, #st INT
SELECT #em = ERROR_MESSAGE(),
#sev = ERROR_SEVERITY(),
#st = ERROR_STATE()
RAISERROR(#em, #sev, #st)
IF ##TRANCOUNT > 0
ROLLBACK TRAN
END CATCH
IF #OwnTran = 1 AND ##TRANCOUNT > 0
BEGIN
COMMIT TRAN
END
END