Method search

pattern/web/__init__.py:2100–2146

Returns a list of results from DBPedia for the given SPARQL query. - type : SPARQL, - start: no maximum, - count: maximum 1000, There is a limit of 10 requests/second. Maximum query execution time is 120 seconds.

(self, query, type=SPARQL, start=1, count=10, sort=RELEVANCY, size=None, cached=False, **kwargs)

        SearchEngine.__init__(self, license, throttle, language)

    def search(self, query, type=SPARQL, start=1, count=10, sort=RELEVANCY, size=None, cached=False, **kwargs):
        """ Returns a list of results from DBPedia for the given SPARQL query.
            - type : SPARQL,
            - start: no maximum,
            - count: maximum 1000,
            There is a limit of 10 requests/second.
            Maximum query execution time is 120 seconds.
        """
        if type not in (SPARQL,):
            raise SearchEngineTypeError
        if not query or count < 1 or start < 1:
            return Results(DBPEDIA, query, type)
        # 1) Construct request URL.
        url = URL(DBPEDIA, method=GET)
        url.query = {
            "format": "json",
             "query": "%s OFFSET %s LIMIT %s" % (query,
                        (start-1) * min(count, 1000),
                        (start-0) * min(count, 1000)
            )
        }
        # 2) Parse JSON response.
        try:
            data = URL(url).download(cached=cached, timeout=30, **kwargs)
            data = json.loads(data)
        except HTTP400BadRequest, e:
            raise DBPediaQueryError, e.src.read().splitlines()[0]
        except HTTP403Forbidden:
            raise SearchEngineLimitError
        results = Results(DBPEDIA, url.query, type)
        results.total = None
        for x in data["results"]["bindings"]:
            r = Result(url=None)
            for k in data["head"]["vars"]:
                t1 = x[k].get("type", "literal") # uri | literal | typed-literal
                t2 = x[k].get("datatype", "?")   # http://www.w3.org/2001/XMLSchema#float | int | date
                v = x[k].get("value")
                v = self.format(v)
                if t1 == "uri":
                    v = DBPediaResource(v)
                if t2.endswith("float"):
                    v = float(v)
                if t2.endswith("int"):
                    v = int(v)
                dict.__setitem__(r, k, v)
            results.append(r)
        return results

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