Delete/clear all contents of a neptune named graph using sparql

Question

I am trying to delete/clear data from a named graph using python. Used approach

import requests
url = "neptune_endpoint:8182/sparql"
query = "CLEAR GRAPH IRIref."
PARAMS = {"query" :query}
r = requests.get(url, params= PARAMS)

getting error malformed query. Thanxs in advance for help.

It looks like you are missing an end quote after `IRIref`. Can you just confirm that this is a typo and edit if so? — Valerio Cocchi, Mar 26 '21 at 15:52
also what is IRIRef? if it's a non prefixed IRI, it has to be put into `<>` — UninformedUser, Mar 27 '21 at 00:07
@sundaramShandilya can you please show the query you're really executing now? the query has to be `CLEAR GRAPH ` - also, it is a SPARQL Update query, thus the query param has to be `update` by default. So, you should use `PARAMS = {"update" :query}` because the overall HTTP request is basically `http://neptune_endpoint:8182/sparql?update=` and then the encoded query string resp. in your case the SPARQL update command — UninformedUser, Mar 28 '21 at 07:40
@UninformedUser my actual query is " CLEAR GRAPH and i tried using it update params still getting an error of InternalServerException. — sundaram Shandilya, Mar 30 '21 at 12:10

score 3 · Accepted Answer · answered Apr 01 '21 at 16:12

The following code should work for you.

import requests
url = "neptune_url:8182/sparql"
query = "CLEAR GRAPH IRIref"
headers = {"content-type": "application/sparql-update"}
r = requests.post(url, data=query, headers=headers)

Note that the specification requires this to be a POST and have specific content type headers set. Neptune is fully SPARQL 1.1 compliant, so the relevant areas in the specification here are https://www.w3.org/TR/sparql11-protocol/#update-operation and https://www.w3.org/TR/sparql11-update/#clear.

Delete/clear all contents of a neptune named graph using sparql

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