For RDBMS based persistence for RDFLib we recommend you use

https://github.com/RDFLib/rdflib-sqlalchemy

PostgreSQL :: a formula-aware RDFLib Store based on AbstractSQLStore

PostgreSQL RDFLib Store, formula-aware implementation. It stores its triples in the following partitions (per AbstractSQLStore):

• Asserted non rdf:type statements
• Asserted rdf:type statements (in a table which models Class membership). The motivation for this partition is primarily query speed and scalability as most graphs will always have more rdf:type statements than others
• All Quoted statements

In addition it persists namespace mappings in a separate table

Requires RDFLib 3.

Install with:

$ pip install rdflib_postgresql

Basic usage:

>>> from rdflib import Graph, URIRef
>>> configString = "user=postgresql dbname=rdflibpostgresql_test"
>>> g = Graph('PostgreSQL', identifier=URIRef("http://example.com/g43"))
>>> g.open(configString, create=True)
1
>>> print(g)
<http://example.com/g43> a rdfg:Graph;rdflib:storage 
                    [a rdflib:Store;rdfs:label 'PostgreSQL'].
>>> print(g.store)
<Parititioned PostgreSQL N3 Store>
>>> print(g.identifier)
http://example.com/g43
>>> g.close()
>>>