Right  viniciusban  i agree. i don't want to perform joins across databases 
explicitly i have never seen that in SQL
BUT I can use the user id from the CAS provider to refer to other tables in 
a database

let's say the *CAS* provider has this table called *auth_user* with a field 
called *id*.
let's say I have another app called *APP1* with a table called* user_exams*with 
a field called 
*user_id*

To make a relationship I can manually get the id from the auth_user table 
(db.auth_user)
and then apply it to the user_exams.

the *CAS* provider contains this table

db.define_table('base_tags',
                Field('name', 'string', label='Tag', length=64, 
required=True, notnull=True),
                format='%(name)s'
                )

*APP1* contains a this table

db.define_table('places_tags',
                Field('place_id', db_app1.places, label='Place', 
required=True, notnull=True, writable=False, readable=False),
                Field('tag_id', *db_cas.base_tags*, label='Tag', 
required=True, notnull=True, writable=False, readable=False)
                )

*Are you saying that Web2Py will not get id from base tags and make that 
relationship?*



On Friday, July 6, 2012 1:56:47 PM UTC-4, viniciusban wrote:
>
> Short answer: manually. 
>
> You cannot connect (join or make a relation) fields among different 
> databases. 
>
>
>
> On 07/06/2012 02:16 PM, Horus wrote: 
> > Yes I understand CAS is for central auth, so i have let the cas provider 
> > be the app that takes care of login, registration, signup, what have 
> > you; as it should 
> > the tables are being created, so I am assuming that the other apps 
> > should be able to access the tables if they exist all in the same 
> database. 
> > 
> > The underlying question, as I had added. 
> > * 
> > how does web2py perform multiple database information exchange?* 
> > 
> > 
> > On Friday, July 6, 2012 12:45:16 PM UTC-4, David Marko wrote: 
> > 
> >     Well CAS is for central authentication, not for sharing database 
> >     tables ... . The error you got simply says that your second app cant 
> >     see tables from cas provider app. 
> > 
>
>

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