• (cs) in reply to anonymous
    anonymous:
    Can anyone deconstruct what it's attempting to do BEFORE it commits seppuku if it fails? 
    WHEN (SELECT COUNT(1) FROM deleted) = 0
THEN N'i'   -- the Knights Who Say N'i' were here
    An UPDATE is handled as a deletion followed by an insertion. When a trigger is active, two virtual tables are available for use: inserted and deleted. DELETE statements fill the deleted table with the rows which are to be deleted. INSERT statements fill the inserted table with rows which are to be inserted. And UPDATE statements fill both tables, deleted with the original version of the rows, inserted with the changed version of the rows. If the deleted table contains 0 rows, this is an INSERT, otherwise it's an UPDATE.
  • frustrated dba (unregistered) in reply to NMe
    NMe:
    I don't really see a huge problem considering what it's apparently used for. It looks like an automated audit log. What should you do when logging fails? Log it somewhere else instead? How would you consolidate that back into your database properly, especially since a select is required to get the proper data in the first place?

    Throwing an error back to the user would also not make sense. Why would you throw an error to the user if the changes they made worked perfectly but you failed to log the fact that they changed things?

    Of course a better way to do this would be to handle the audit log in your framework where any query is automatically logged (and in which you can send a message to support if something goes wrong), but lacking that I don't think this is that terrible of a solution.

    Why is it, why is it, that I always end up working with you and your best friend?

  • (cs) in reply to Pawprint
    Pawprint:
    anonymous:
    Can anyone deconstruct what it's attempting to do BEFORE it commits seppuku if it fails? 
    WHEN (SELECT COUNT(1) FROM deleted) = 0
THEN N'i'   -- the Knights Who Say N'i' were here
    An UPDATE is handled as a deletion followed by an insertion. When a trigger is active, two virtual tables are available for use: inserted and deleted. DELETE statements fill the deleted table with the rows which are to be deleted. INSERT statements fill the inserted table with rows which are to be inserted. And UPDATE statements fill both tables, deleted with the original version of the rows, inserted with the changed version of the rows. If the deleted table contains 0 rows, this is an INSERT, otherwise it's an UPDATE.
    Well this explains only half the mystery. The remaining be: Why say N'i' here?

    Turns out this is a bonus WTF: What is the meaning of the prefix N in T-SQL statements?

    You may have seen Transact-SQL code that passes strings around using an N prefix. This denotes that the subsequent string is in Unicode (the N actually stands for National language character set). Which means that you are passing an NCHAR, NVARCHAR or NTEXT value, as opposed to CHAR, VARCHAR or TEXT.
    Now check the declaration of that variable!
  • (cs) in reply to Rorre
    Rorre:
    Fortunately, in most cases the Catch will fail since in a proper system the calling user won't have permission to drop triggers.

    One would hope.

    Now, that's funny.

  • (cs) in reply to no laughing matter
    no laughing matter:
    Pawprint:
    anonymous:
    Can anyone deconstruct what it's attempting to do BEFORE it commits seppuku if it fails? 
    WHEN (SELECT COUNT(1) FROM deleted) = 0
THEN N'i'   -- the Knights Who Say N'i' were here
    An UPDATE is handled as a deletion followed by an insertion. When a trigger is active, two virtual tables are available for use: inserted and deleted. DELETE statements fill the deleted table with the rows which are to be deleted. INSERT statements fill the inserted table with rows which are to be inserted. And UPDATE statements fill both tables, deleted with the original version of the rows, inserted with the changed version of the rows. If the deleted table contains 0 rows, this is an INSERT, otherwise it's an UPDATE.
    Well this explains only half the mystery. The remaining be: Why say N'i' here?

    Turns out this is a bonus WTF: What is the meaning of the prefix N in T-SQL statements?

    You may have seen Transact-SQL code that passes strings around using an N prefix. This denotes that the subsequent string is in Unicode (the N actually stands for National language character set). Which means that you are passing an NCHAR, NVARCHAR or NTEXT value, as opposed to CHAR, VARCHAR or TEXT.
    Now check the declaration of that variable!

    I see the abuse of that too many times:

    SET @Query = N'SELECT Username ' +
   N' FROM Users ' +
   N' WHERE UserID = ' +
   @UserID;

    Bonus points if you can figure out the hidden WTF in that code.

  • DBA DUDE (unregistered) in reply to chubertdev

    I don't see a wtf, I just see something that won't compile in T-SQL. If @UserID is a string, it needs to be quoted before the query can be executed. If @UserID is a number, it has to be cast as a string. Well, I guess there is a third case where @UserID is typed as a string, but holds a number. In that case, the code would compile, it would execute, and I would scream.

  • Blaney Krichen (unregistered) in reply to Roby McAndrew
    Roby McAndrew:
    If code fails it is right and proper that it commits Sudoku
    FTFY
  • anonymous (unregistered) in reply to DBA DUDE
    DBA DUDE:
    Well, I guess there is a third case where @UserID is typed as a string, but holds a number. In that case, the code would compile, it would execute, and I would scream.
    ...not to mention that someone might have the UserID "1;DROP TABLE Users;".
  • (cs) in reply to DBA DUDE
    DBA DUDE:
    I don't see a wtf, I just see something that won't compile in T-SQL. If @UserID is a string, it needs to be quoted before the query can be executed. If @UserID is a number, it has to be cast as a string. Well, I guess there is a third case where @UserID is typed as a string, but holds a number. In that case, the code would compile, it would execute, and I would scream.

    That would be the WTF. Inferring that it does compile, @UserID would be a string. And yes, you should scream at something like this.

  • (cs)

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  • C (unregistered)

    I just tested, and the code below will happily drop itself:

    CREATE TRIGGER dbo.test_Self_Destruct ON dbo.tmp_a_test AFTER INSERT
AS
BEGIN
	drop TRIGGER dbo.test_Self_Destruct
END
  • Anonymous (unregistered)

    Am I the only one that found the unicorn? Or is it something well known here?

  • anonymous (unregistered) in reply to Anonymous
    Anonymous:
    Am I the only one that found the unicorn? Or is it something well known here?
    The latter thing. Also, view the page source or you'll miss out on some of Remy's wit and wisdom.

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