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@@Identity Hell with VFP TableUpdate
Message
From
27/01/2003 04:24:40
 
 
General information
Forum:
Microsoft SQL Server
Category:
SQL syntax
Miscellaneous
Thread ID:
00734151
Message ID:
00745653
Views:
33
Hi!

What you meant as "context" of use?

Well, what about following scenario:

Inside transaction, when you insert new record into some table, thattable is probably locked from other insertions till transaction end. Am I right? If yes, than use of IDENT_CURRENT is very obvious:

1. Start transaction
2. Insert record into "MyTable"
3. Get new record ID using IDENT_CURRENT("MyTable"). It will be reliable because nobody else can insert record there while table is locked.
4. End transaction.

Would above work?

I think it is required also to should disallow trigger recursion for above, though I think it is not very needed, because I really cannot imagine when it is needed to insert record into same table in the insert trigger.

Anyway, I think it is better than @@IDENTITY.

>I cannot think of a situation where you would want to use IDENT_CURRENT. The reliability of it's use would depend on the context in which is was used.
>
>-Mike
>
>
>>Hi!
>>
>>So, what about question related to IDENT_CURRENT? Is it reliable in multi-user environment? Is my assumption correct about inserting inside of transaction? I still could not understand it's purpose. For what such variable could be used, if it is completely useless/not reliable in multi-user environment?
>>
>>>It comes down to a number of issues, really:
>>>
>>>Remote views create ad-hoc queries that are sent to the server. I have very little control over the format of those queries. With a stored procedure, I have complete control.
>>>
>>>Also, when using stored procedure I have better control over security. I can deny the login access to all tables, yet still allow for the manipulation of data through stored procedure.
>>>
>>>Stored procedures provide another layer of abstraction. I can make changes to the schema, or adjust rules and as long as the stored procedure's signature doesn't change, the consumer isn't affected.
>>>
>>>There are also performance issues. Stored procedures will usually perform better than ad-hoc queries.
>>>
>>>-Mike
Vlad Grynchyshyn, Project Manager, MCP
vgryn@yahoo.com
ICQ #10709245
The professional level of programmer could be determined by level of stupidity of his/her bugs

It is not appropriate to say that question is "foolish". There could be only foolish answers. Everybody passed period of time when knows nothing about something.
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