DgraphAndWeaviateTest

OsProject

OsProject
edit
id	DgraphAndWeaviateTest
state
owner	Wolfgang Fahl
title	DgraphAndWeaviateTest
url	https://github.com/WolfgangFahl/DgraphAndWeaviateTest
version	0.0.1
description
date	2020/08/05
since
until

This is sample project to test Python based access to Dgraph, Weaviate and Apache Jena

Installation and test

Prerequisites

• python > version 3.6 - tested with version 3.6/3.7/3.8
• docker e.g. docker desktop community - testes with docker desktop 2.3.0.4

Installation

https://github.com/WolfgangFahl/DgraphAndWeaviateTest
cd DgraphAndWeaviateTest
scripts/install

Starting servers

see also DgraphAndWeaviateTest

# command to run Dgraph
# pull dgraph
scripts/dgraph -p
# run dgraph
scripts/dgraph
# pull and run weaviate
scripts/weaviate
# install apache jena and load example data
scripts/jena -l sampledata/example.ttl
# run apache jena fuseki server
scripts/jena -f example

Dgraph Installation

docker based pull:

scripts/dgraph -p

Dgraph start

docker based start of

• alpha
• ratel
• zero

scripts/dgraph

Dgraph stop

scripts/dgraph -k

scripts/dgraph usage

scripts/dgraph -h
scripts/dgraph [-b|--bash|-c|--clean|-h|--help|-k|--kill|-p|--pull]

-b | --bash: start a bash terminal shell within the currently running container
-h | --help: show this usage
-k | --kill: stop the docker image
-p | --pull: pull the docker image
-c | --clean: clean start with kill and purge of all data

Example unit test

Dgraph unit test

def testDgraph(self):
        ''' 
        test basic Dgraph operation
        '''
        dgraph=Dgraph(debug=True)
        # drop all data and schemas
        dgraph.drop_all()
        # create a schema for Pokemons
        schema='''
        name: string @index(exact) .
        weight: float .
        height: float .
type Pokemon {
   name
   weight
   height
}'''
        dgraph.addSchema(schema)
        # prepare a list of Pokemons to be added
        pokemonList=[{'name':'Pikachu', 'weight':  6, 'height': 0.4 },
                  {'name':'Arbok',   'weight': 65, 'height': 3.5 }, 
                  {'name':'Raichu',  'weight': 30, 'height': 0.8 }, 
                  {'name':'Sandan',  'weight': 12, 'height': 0.6 }]
        # add the list in a single transaction
        dgraph.addData(obj=pokemonList)
        # retrieve the data via GraphQL+ query
        graphQuery='''{
# list of pokemons
  pokemons(func: has(name), orderasc: name) {
    name
    weight
    height
  }
}'''
        queryResult=dgraph.query(graphQuery)
        # check the result
        self.assertTrue('pokemons' in queryResult)
        pokemons=queryResult['pokemons']
        self.assertEqual(len(pokemonList),len(pokemons))
        sortindex=[1,0,2,3]
        for index,pokemon in enumerate(pokemons):
            expected=pokemonList[sortindex[index]]
            self.assertEquals(expected,pokemon)
        # close the database connection
        dgraph.close()

Example test session

see https://travis-ci.org/github/WolfgangFahl/DgraphAndWeaviateTest/jobs/715131236