On Nov 6, 10:37 am, mawei1981 <[EMAIL PROTECTED]> wrote:
> Hi, All
>
> As we know, the database provide a unique key not a primary key to
> support we store some content we do not like redundant, we query some
> content use distinct because we do not want to see redundant record.
>
> So, when I store some url or email address in my spider(written under
> app engine), I need to create a entity to store the content, and I
> guess I don't need to execute a GQL to check it has exist.
up till now you have to
see http://code.google.com/p/googleappengine/issues/detail?id=178
>
> Someone can tell me, Does app engine has this Property of db.Model?
>
> Maven
> 2008-11-06
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