Download model via `pystardog` or HTTP API

Stardog Studio
3

Hi Jamie.

I think what you're looking for is to export a named graph contained in a database which is what that "download" button is doing in Studio.

REST API: API Reference | ReDoc -

Note: I think what may be missing from this documentation is the graph_uri query parameter which will allow you to export just a named graph from the database instead of the entire database.

pystardog docs: Modules — pystardog documentation

Below is example using pystardog that shows how to export a graph/model 2 different ways.

  1. with streaming the contents of the model/graph back (avoids reading the graph into memory all at once - useful for large graphs)
  2. just getting the contents of the graph back all at once:
import stardog

connection_details = {
    "endpoint": "https://sd-######.stardog.cloud:5820",
    "username": "someuser",
    "password": "somepassword",
    "database": "my_database",
}
model_uri = "urn:example:starwars:model"

# streams an export of the graph/model serialized as Turtle
# a generator that yields bytes making up the graph/model is returned
# avoids reading the graph/model at once into memory for large graph/models
# `chunk_size` parameter available to control the amount of bytes to read per chunk when streaming
model = ""
with stardog.Connection(**connection_details) as conn:
    with conn.export(
        graph_uri=model_uri, stream=True, content_type=stardog.content_types.TURTLE
    ) as stream:
        for chunk in stream:
            model += chunk.decode("utf-8")

print(f"---MODEL (STREAMED)---\n{model}\n\n")

# exports the graph/model serialized as turtle
# send whole response (graph/model) back as as bytes
with stardog.Connection(**connection_details) as conn:
    model = conn.export(graph_uri=model_uri, content_type=stardog.content_types.TURTLE)

print(f"---MODEL---\n{model.decode('utf-8')}")

Hope that helps!

Cheers,
Noah