How to import data in relational database to RDF?

Question

How can I get data from a relational database into RDF?

Answer 1

I suggest D2RQ which can convert SPARQL (RDF query) into a relational SQL query. You don't need to convert/export.

Answer 2

The following document by the ESW group, entitled A Survey of Current Approaches for Mapping of Relational Databases to RDF , as the title suggests, lists the current protocols and available software for converting relational data to RDF.

Answer 3

The OpenLink Virtuoso Universal Server enables the mapping of Relational Data to RDF for most popular Databases as detailed at:

http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSSQL2RDF