https://github.com/gatenlp/sesamesparql

Query a SPARQL Endpoint and Retrieve Result as a TSV file
https://github.com/gatenlp/sesamesparql

cli command-line-tool openrdf sparql sparql-query tsv

Last synced: about 2 months ago
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Query a SPARQL Endpoint and Retrieve Result as a TSV file

• Host: GitHub
• URL: https://github.com/gatenlp/sesamesparql
• Owner: GateNLP
• Created: 2020-05-25T10:07:43.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2022-07-07T09:54:02.000Z (over 2 years ago)
• Last Synced: 2024-04-16T07:59:27.931Z (9 months ago)
• Topics: cli, command-line-tool, openrdf, sparql, sparql-query, tsv
• Language: Java
• Size: 2.24 MB
• Stars: 0
• Watchers: 13
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Tool for Accessing a SPARQL endpoint and fetching query results from there.

Simple API and command line tool to retrieve the result of SPARQL queries from a 

Sesame repository.

The tool can be used to retrieve large result sets without overwhelming the server by retrieving

small batches of data (see option -b below) and allows to increase the maxmimum query timeout

for queries over a large repository.

## Setup 

* clone the repository and change into the directory

* run `mvn package`

This creates a single jar in `./target` which contains all the dependencies.

## Usage

Run the command:

```

./bin/query.sh -u  -i  [OTHEROPTIONS]

```

The result rows are written to standard output.

To get usage information:

```

./bin/query.sh -h

```

This outputs:

```

usage: ./bin/query.sh [options]

 -b     Batchsize for queries, default: retrieve all at once

 -ee    error on invalid strings: true or false, default=false

 -h          Show help information

 -i     Query input file (required)

 -ii    include inferred: true or false, default=true

 -mt    maximum query time in seconds, default=3600

 -ph    print headers: true or false, default=false

 -u     endpoint URL (required)

```

### Examples

Query DBPedia and get the URI and English language film title of films starring Charlie Chaplin:

Query file `examples/example2.sparql`:

```

PREFIX dbo: 

PREFIX res: 

PREFIX rdf: 

PREFIX rdfs: 

SELECT DISTINCT ?uri ?string

WHERE {

        ?uri rdf:type dbo:Film .

        ?uri dbo:starring res:Charlie_Chaplin .

        OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') }

}

```

Run the command to retrieve the result, write to file `chaplin_films.tsv` with column headers:

```

./bin/query.sh -ph true -u  http://DBpedia.org/sparql -i examples/example2.sparql > chaplin_films.tsv 

```