I want to get the results of multiple queries into single call onto freebase,which is there in this chapter http://mql.freebaseapps.com/ch04.html. I am using python for querying. I want to query like this
{ # Start the outer envelope
"q1": { # Query envelope for query named q1
"query":{First MQL query here} # Query property of query envelope
}, # End of first query envelope
"q2": { # Start query envelope for query q2
"query":[{Second MQL query here}] # Query property of q2
} # End of second query envelope
}
and get answers like
{
"q1": {
"result":{First MQL result here},
"code": "/api/status/ok"
},
"q2": {
"result":[{Second MQL result here}],
"code": "/api/status/ok"
},
"status": "200 OK",
"code": "/api/status/ok",
"transaction_id":[opaque string value]
}
As specified on that link. I also came across some of the question on SO, which are -
But they seems to be using the old API which is "api.freebase.com". The updated API is "www.googleapis.com/freebase"
I tried the following code, but its not working.
import json
import urllib
api_key = "freebase_api_key"
service_url = 'https://www.googleapis.com/freebase/v1/mqlread'
query1 = [{'id': None, 'name': None, 'type': '/astronomy/planet'}]
query2 = [{'id': None, 'name': None, 'type': '/film/film'}]
envelope = {
'q1':query1,
'q2':query2
}
encoded = json.dumps(envelope)
params = urllib.urlencode({'query':encoded})
url = service_url + '?' + params
print url
response = json.loads(urllib.urlopen(url).read())
print response
I am getting error as
{u'error': {u'code': 400, u'message': u'Type /type/object does not have property q1', u'errors': [{u'domain': u'global', u'message': u'Type /type/object does not have property q1', u'reason': u'invalid'}]}}
How can I embed multiple queries into a single MQL query
