I have been working on various relationship extraction models in python and all the relationships are currently saved in dataframes or csv files. Eventually I would like to create an RDF graph. Since I am working in python I was going to create the RDF using RDFlib and read the RDF into Apache Jena into a model that I can query. Is this a good workflow or is there a better way?
1 Answers
Quite late, but as I ran into a similar problem, heres my way how to talk to Jena TDB from python.
You could also make use of JayDeBeApi and the official Jena TDB JDBC Driver. You have to make sure that the JDBC Driver is available in the Java classpath.
import jaydebeapi
jclass = "org.apache.jena.jdbc.JenaJDBC"
conn_string = "jdbc:jena:tdb:location=/path/to/tdbstore"
conn = jaydebeapi.connect(jclass, conn_string)
cursor = conn.cursor()
query = """
SELECT DISTINCT ?a
WHERE {
?a ?b ?b .
}
"""
cursor.execute(query)
# do something with the results
cursor.close()
conn.close()
You can also add &must-exist=true|false to conn_string denoting whether the store must exist or not.
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