If you’re interested in connecting your Java applications to standard SQL databases like Oracle, My SQL, SQL Server, and others, is what you need.
Once you’re connected to the database with JDBC, most SQL queries are identical, or at least very similar.
This means that the drivers can be used with JDBC tools provided that those tools don't restrict you to SQL or auto-generate SQL.
So it can be used with a tool like Squirrel SQL since you can freely enter SPARQL queries and updates.
Use the following procedure to view links or to refresh them when the structures of the linked tables have changed.
Jena JDBC is a set of libraries which provide SPARQL over JDBC driver implementations.