Re: [Tracker] datatype management in TrackerSparqlBuilder

[Jürg Billeter <j bitron ch>]

On Thu, 2009-11-26 at 21:34 +0100, Roberto -MadBob- Guido wrote:
> Little time ago
> (
> http://mail.gnome.org/archives/tracker-list/2009-November/msg00090.htm
> l ) someone already moved some observation about limitations in
> TrackerSparqlBuilder, and I'd like to revamp discussion and understand
> how this interface to Tracker may be improved.
>
> At the actual stage queries are built token by token, with specific
> functions to append strings, numbers, dates and other datatypes
> depending on the predicate. This is quite tedious since for each
> statement a different (a priori known) function must be called, and the
> task may be impossible to achieve if the query is dinamically built by
> some external configuration (so: developer doesn't know which predicates
> will be required, so no which datatype is the correct one to be used).

You can use the object_string method for all non-IRI literals such as
integers, date/time, booleans, and obviously strings. The methods
object_boolean, object_int64, object_date, and object_double are only
convenience methods, you don't need to use them if you don't want to.

For URIs/IRIs you need to use the object_iri method, however, I don't
think that this causes any issues.

JÃrg