DALQuery¶
- class pyvo.dal.DALQuery(baseurl, *, session=None, **keywords)[source]¶
Bases:
dict
a class for preparing a query to a particular service. Query constraints are added via its service type-specific methods. The various execute() functions will submit the query and return the results.
The base URL for the query can be changed via the baseurl property.
A session can also optionally be passed in that will be used for network transactions made by this object to remote services.
initialize the query object with a baseurl
Attributes Summary
the base URL that this query will be sent to when one of the execute functions is called.
The URL that encodes the current query.
Methods Summary
execute
()submit the query and return the results as a Results subclass instance
submit the query and return the raw response as a string.
execute_stream
(*[, post])Submit the query and return the raw response as a file stream.
execute_votable
(*[, post])Submit the query and return the results as an AstroPy votable instance.
Raise if there was an error on http level.
submit
(*[, post])does the actual request
Attributes Documentation
- baseurl¶
the base URL that this query will be sent to when one of the execute functions is called.
- queryurl¶
The URL that encodes the current query. This is the URL that the execute functions will use if called next.
Methods Documentation
- execute()[source]¶
submit the query and return the results as a Results subclass instance
- Raises
- DALServiceError
for errors connecting to or communicating with the service
- DALQueryError
for errors either in the input query syntax or other user errors detected by the service
- DALFormatError
for errors parsing the VOTable response
- execute_raw()[source]¶
submit the query and return the raw response as a string.
No exceptions are raised here because non-2xx responses might still contain payload. They can be raised later by calling
raise_if_error
- execute_stream(*, post=False)[source]¶
Submit the query and return the raw response as a file stream.
No exceptions are raised here because non-2xx responses might still contain payload. They can be raised later by calling
raise_if_error
- execute_votable(*, post=False)[source]¶
Submit the query and return the results as an AstroPy votable instance. As this is the level where qualified error messages are available, they are raised here instead of in the underlying execute_stream.
- Returns
- astropy.io.votable.tree.VOTableFile
an Astropy votable object
- Raises
- DALServiceError
for errors connecting to or communicating with the service
- DALFormatError
for errors parsing the VOTable response