Transaction Save Point (SET XACT_ABORT { ON | OFF })

ref:http://blog.csdn.net/wym3587/article/details/6940630

ref:http://www.cnblogs.com/jiajiayuan/archive/2011/07/13/2105398.html

当 SET XACT_ABORT 为 OFF 时，有时只回滚产生错误的 Transact-SQL 语句，而事务将继续进行处理。如果错误很严重，那么即使 SET XACT_ABORT 为 OFF，也可能回滚整个事务。OFF 是默认设置。

success code:

print @@trancount
begin tran
SET XACT_ABORT off
	CREATE TABLE ValueTable ([value] int)
	save transaction sp1
	begin try
			INSERT INTO ValueTable VALUES(1);
				--begin try
				--INSERT INTO ValueTable VALUES('ok');
				--end try
				--begin catch
				Raiserror('eeee',16,1)
				--end catch
	end try
	begin catch
	 select @@trancount
	 rollback transaction sp1
	end catch
commit
DROP TABLE ValueTable;

　　

failure code because error is so serious :

print @@trancount
begin tran
SET XACT_ABORT off
	CREATE TABLE ValueTable ([value] int)
	save transaction sp1
	begin try
			INSERT INTO ValueTable VALUES(1);
				begin try
				INSERT INTO ValueTable VALUES('ok');
				end try
				begin catch
				Raiserror('eeee',16,1)
				end catch
	end try
	begin catch
	 select @@trancount
	 rollback transaction sp1
	end catch
commit
DROP TABLE ValueTable;

Output Message:
0

(1 row(s) affected)

(0 row(s) affected)

(1 row(s) affected)
Msg 3931, Level 16, State 1, Line 19
The current transaction cannot be committed and cannot be rolled back to a savepoint. Roll back the entire transaction.

　　

So, in catch block, we should rollbacck entire tran when(XACT_STATE()) = -1:

BEGIN CATCH
    -- Test XACT_STATE for 0, 1, or -1.
    -- If 1, the transaction is committable.
    -- If -1, the transaction is uncommittable and should
    --     be rolled back.
    -- XACT_STATE = 0 means there is no transaction and
    --     a commit or rollback operation would generate an error.

    -- Test whether the transaction is uncommittable.
    IF (XACT_STATE()) = -1
    BEGIN
        PRINT 'The transaction is in an uncommittable state.' +
              ' Rolling back transaction.'
        ROLLBACK TRANSACTION;
    END;

    -- Test whether the transaction is active and valid.
    IF (XACT_STATE()) = 1
    BEGIN
        PRINT 'The transaction is committable.' +
              ' Committing transaction.'
        COMMIT TRANSACTION;
    END;
END CATCH;