Hi!
On Mon, Dec 20, 2010 at 09:46:16PM -0500, Ben Timby wrote:
> class Path(sqlobject.SQLObject):
> parent = sqlobject.ForeignKey('SyncPath', cascade=True)
As far as I understand from the following query, 'SyncPath' should be
just 'path', right?
> path = sqlobject.StringCol(alternateID=True)
>
> select p2.*
> from path as p0
> left join path as p1
> on p1.parent_id = p0.id
> and p0.path = 'home'
> left join path as p2
> on p2.parent_id = p1.id
> and p1.path = 'btimby'
> and p2.path = 'somefile';
>
> How could I accomplish this in SQLObject? I would have code similar to
> the following, but not sure how to generate the aliases and multiple
> levels of joins...
Aliases are created using sqlobject.sqlbuilder.Alias:
p1 = Alias(Path)
This uses autogenerated numbers for alias naming. If you want to give
a specific name to an alias:
p1 = Alias(Path, 'p1')
Now you can use the alias as a table: p1.q.parent_id == id.
> sql = Path.select(sqlbuilder.LEFTJOINOn(
The first parameter for .select() is a WHERE condition. JOINs are
provided in the 'join' parameter. Pass a JOIN or a list of JOINs:
Path.select(join=LEFTJOINOn(...))
Path.select(join=[LEFTJOINOn(...), LEFTJOINOn(...)])
Oleg.
--
Oleg Broytman http://phd.pp.ru/ [email protected]
Programmers don't die, they just GOSUB without RETURN.
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