often referred as "materialized views" for the ones who can spare me a
lecture about what are exactly those :P, let's say you have an
iper-complicated query that "reconstructs" to a "table" that you want to
show in a grid just for searching purposes (other purposes not listed,
sorry, they make absolute no sense)
the dba that is in you says "I'll write a view for my iper-complicated
query" ...
so, you code something like
create view iperquery as
select something_that_resemble_a_sequence, bla1, bla2, bla3,
.....
from bla1
.....
left outer join (
select blablabla
group by blablabla
)
.....
where max(whatever) > 0
Perfect. now you can do a "select * from iperquery" and your db engine does
all the work.
To use "iperquery" as a table (read-only mode, for write only go to see
docs about your engine support for keyed views, another story I'm NOT going
to cover here) ....
db.define_table('iperquery',
Field('something_that_resemble_a_sequence', 'id')
Field('bla1'),
Field('bla2'),
.....,
migrate=False
)
the migrate=False bit is the key: web2py won't try creating it and assumes
there's a table ready to be used.
You just need to:
- include a pkey, better if resembles a sequence, and have a Field of type
'id' matching it
- tune the Field types accordingly to the type of column of your view
On Friday, April 5, 2013 11:24:23 PM UTC+2, Jurgis Pralgauskis wrote:
>
> You'll better code a view and access it as a "fake table".
>>
>
> are there examplses of this?
>
> Is it possible to show virtual fields in grid (in appadmin they don't show
> up)?
>
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