Fuseki Update - Sparql query error

Question

Hi There,

I am running a fuseki server and running update requests over http. I have no problem running queries using the endpoint (as specified on http://jena.apache.org/documentation/serving_data/index.html) - end_point_query= "http://host/fuseki/ds/query";

This works fine. When I attempt to do a update using end_point_update = "http://host/fuseki/ds/update";

I get the following error "Sparql query error: 400 Error 400: SPARQL Update: Multiple 'update=' parameters"

It works fine using the "sparql.tpl" web client provided with fuseki. So, I am wondering if it is a permissions issue?

Any help is much appreciated!

Kind Regards,

Kris.

Accepted Answer

1

The problem is how you are sending the request; the SPARQL Update is fine.

There must be exactly one request= or exactly one update=. More than one, or one of each causes that error.

e.g.

 curl --data 'request=INSERT DATA {}' \
      --data 'update=INSERT DATA {}' \
      http://localhost:3030/ds/update

provokes that message.

update= is standard, request= is a synonym.

link

answered 23 Jan, 08:43

AndyS ♦
9.5k●2●7
accept rate: 33%

Answer 2

Hi Andy,

Many thanks for the response!

Yes, but I am quite sure I am only sending one update. As I say, I have been able to query without any problem. It is only when I attempt to update that I run into this problem.

Perhaps there is an issue with my sparql_update function?

var end_point_update = "http://host/fuseki/ds/update";

function sparql_update (query_str) {

g_query_result_string = undefined;

var querypart = "query=" + escape (query_str); // escape makes the string ASCII-portable

var xmlhttp = new XMLHttpRequest (); // ajax

xmlhttp.open ('POST', end_point_update, false); // GET can have caching probs, so POST. NOT ASYNCHRONOUS - WAIT

// probably need these headers
xmlhttp.setRequestHeader ('Content-type', 'application/x-www-form-urlencoded');
xmlhttp.setRequestHeader ("Accept", "application/sparql-results+json");

// Set up callback to get the response asynchronously.
xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState == 4) {
        if (xmlhttp.status == 200) {
            // results are in a string in xmlhttp.responseText but we can't return it from this sub-function
            console.log (xmlhttp.responseText);
        } else {
            // Some kind of error occurred.
            alert("Sparql query error: " + xmlhttp.status + " " + xmlhttp.responseText);
        }
    }
}
// Send the query to the endpoint.
xmlhttp.send (querypart);
// here we have the query result in a string, let's convert it to json, then return a JS object
return result_json = eval("(" + xmlhttp.responseText + ")");

}

Kind Regards,

Kris.

Fuseki Update - Sparql query error

Follow this question

Upcoming Events

Related questions