SQL things and rollback

The first type:

BeginTry
BeginTranTran1
InsertIntoT1 (Id, C1)Values(1,‘1‘)
InsertIntoT1 (Id, C1)Values(‘XX2‘,‘2‘)--This sentence produces an error
COMMITTRANTran1
END Try
Begin Catch
raiserror 50005N' gone wrong '
ROLLBACK TRAN Tran1 ---call rollback after an error
END Catch

The second type:

SETXact_abortOn----The statement produces a run-time error, and the entire transaction terminates and rolls back.
BeginTran
INSERTIntoT1 (Id, C1)VALUES(1,‘1 )
     insert  into t1 (ID, C1)   values xx2 ' , 2 ' )  --
commit  tran

SQL things and rollback