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Creating a new order on two PCs
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À
15/07/2016 02:48:53
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
01638327
Message ID:
01638432
Vues:
53
>>Based on the input from Thomas Ganss I am checking the code on my Cursor Adapter. And I find that the PK value set in the Cursor Adapter is based on the following code:
>>
>>
>>this.ca_object.InsertCmdRefreshFieldList = ALLTRIM(tcIdentityField)
>>this.ca_object.InsertCmdRefreshCmd = "SELECT @@IDENTITY"
>>
>>
>>I thought that @@IDENTITY will get the last identity on the "current session". Therefore, I thought that it should not get the value of new identity created by another user (that is, another session). Am I wrong?
>>
>>UPDATE. This customer who is giving me the problem (or the other way around), I think, is using Terminal Server or some similar technology. So I am thinking that - maybe - all users, as far as SQL Server is concerned, are using the same session. Another thing to explore.
>
>One instance where @@IDENTITY will not give you the value you want - if you have a trigger on the table and the trigger does an insert into a table that has an identity.
>
>For a single insert....if you want the identity value directly as a result of that specific insert, use SCOPE_IDENTITY()
>
>Also...Naomi's suggestion about INSERT INTO...OUTPUT is a good one, especially if that INSERT is inserting multiple rows. The OUTPUT piece allows you to get at the specific value(s) as a result of the INSERT. It's like getting an "echo" of what the insert eventually did. It's a great feature.

I read about the difference between @@IDENTITY and SCOPE_IDENTITY and aside from a "trigger" problem they work the same. And I don't have triggers.

Until I can "see" that OUTPUT will help, I won't change code that works for 99.99% of the customers. Btw, This "Insert" only one row.

Plus, I am using VFP Cursor Adapter and I don't know, yet, if OUTPUT can be applied to the class I created (based on CA).

Thank you.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
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