SubqueriedConstraint¶
- class pyvo.registry.SubqueriedConstraint[source]¶
- Bases: - Constraint- An (abstract) constraint for when the constraint is over a table other than rr.resource. - We need to be careful with these, because they will in general have 1:n relationships to rr.resource, and these will lead to duplicated interfaces if we just do the NATURAL JOIN we normally do. - Instead, we have to resort to ivoid in (subquery) conditions. In particular, extra_tables will always be empty for these. - To configure those, give the table to query in _subquery_table and _condition, _fillers, and _keyword as usual. The rest is taken care of by get_search_condition. - Methods Summary - get_search_condition(service)- Formats this constraint to an ADQL fragment. - Methods Documentation - get_search_condition(service)[source]¶
- Formats this constraint to an ADQL fragment. - This takes the service the constraint is being executed on as an argument because constraints may be written differently depending on the service’s features or refuse to run altogether. - Parameters:
- serviceTAPService
- The RegTAP service the query is supposed to be run on (that is relevant because we adapt to the features available on given services). 
 
- service
- Returns:
- str
- A string ready for inclusion into a WHERE clause.