Want to parse RDF file and save to PostgreSQL ? Want to schedule and automate this importing task?
To import Xml format RDF file (.rdf, .owl) to PostgreSQL, https://www.withdata.com/blog/rdftopostgres/postgresql-import-rdf.html
To import RDF Turtle file (.ttl, .n3) to PostgreSQL, https://www.withdata.com/blog/rdftopostgres/ttl-to-postgresql.html
To import RDF N-Triples file (.nt, .ntriples) to PostgreSQL, https://www.withdata.com/blog/rdftopostgres/n-triples-to-postgresql.html
To import RDF N-Quads file (.nq, .nquads) to PostgreSQL, https://www.withdata.com/blog/rdftopostgres/n-quads-to-postgresql.html
RDF → PostgreSQL reference
Type mapping
| Value kind | in RDF | in PostgreSQL |
|---|---|---|
| Int | "1234"^^xsd:int | integer |
| Bigint | "9007199254740993"^^xsd:long | bigint |
| Decimal | "1234.56"^^xsd:decimal | numeric(p,s) |
| Float | "1.234e10"^^xsd:double | double precision |
| Text | plain literal without a datatype | varchar(n) |
| Long text | plain literal; newlines allowed inside | text |
| Date | "2026-09-18"^^xsd:date | date |
| Datetime | "2026-09-18T14:30:00Z"^^xsd:dateTime | timestamp |
| Binary | "base64..."^^xsd:base64Binary | bytea |
| Boolean | "true"^^xsd:boolean | boolean |
| JSON | a literal, or reified as its own sub-graph | jsonb |
Dialect differences
RDF is a file format and PostgreSQL is a database server, so the target has to be told the types the file never carried - the rows below are where the two sides diverge.
| Property | in RDF | in PostgreSQL |
|---|---|---|
| port | — | 5432 |
| identifiers | XML attribute quoting; entities for reserved characters | "double quotes" |
| row limit | — | LIMIT n |
| dates | xsd:dateTime typed literals | timestamp, timestamptz, date, time |
| long text | — | TEXT |
| binary | xsd:base64Binary typed literals | BYTEA |
| separator | XML elements (rdf:Description / rdf:resource) | — |
| encoding | Declared in the XML declaration | — |
| typing | Every value is a resource or a typed literal | — |
| shape | Graph of triples; there are no rows or columns | Tables of rows and columns |
| ceiling | Whole document is usually parsed into memory | — |
Command line
| Side | Command |
|---|---|
| PostgreSQL | pg_dump or COPY ... TO |
| PostgreSQL (load) | COPY ... FROM |
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