Thanks Andy, I wanna clarify my questions.
In case we don’t use TDB, the alternative is already chosen (whether we like it or not). It’s a specific platform, that has both Graph and Relational DB that are very fast. They both don’t have SPARQL adapters. We want to avoid implementing SPARQL layers, so my question is: In which case I would have less efforts (NOT implementing SPARQL layer), Relational DB adapter or Graph DB adapter, or in both cases I will need to implement and maintain the SPARQL layer? Regards, Stefan On 12/22/17, 4:41 PM, "Andy Seaborne" <[email protected]> wrote: On 23/12/17 00:15, Dimov, Stefan wrote: > Thanks Andy, > > I didn’t quite understand this: > > “1/ Use SPARQL (interface RDFConnection) to connect to a remote triple > store. SPARQL tripe stores are very good at implementing the standards.” > > Does it mean that the graph DB I wanna use, should (out-of-the-box) support triples and SPARQL or this is the part that I should implement in order to use it with Jena? There are quiet a few SPARQL triple stores. Choose and use. RDFConnection is part of the Jena codebase. > > Can you, please, point me, to examples how to: > > 1. Implement SQL adapter See the code for jena-sdb. This component is "maintenance only". > 2. Implement usage of alternative graph DB Choose your SPARQL triplestore, download and use! SPARQL and it's protocols are standards. The tripe store can be any one that implements the standards. In the SPARQL world, compliance levels are high. > > Happy holidays! > Stefan > > > On 12/21/17, 1:46 AM, "Andy Seaborne" <[email protected]> wrote: > > > > On 21/12/17 04:41, Dimov, Stefan wrote: > > Hi all, > > > > Where can I find more detailed info on how can use Jena with: > > > > > > 1. RDBMS > > * Does it support just any RDBMS? > > The supported databases are described in the documentation: > > https://jena.apache.org/documentation/sdb/databases_supported.html > > Note: > [[ > Use of SDB for new applications is not recommended. > This component is "maintenance only". > TDB is faster, more scalable and better supported than SDB. > ]] > > > * If not, and I want to use it with different (from the supported) RDMS what should I do? > > Do you need it to be an SQL database? (Someone was doing HAMA at one > time but we didn't hear back from them). > > You have to write the SQL adapter - SQL syntax, especially for DDL, is > quite variable. There are various examples to start with. > > But SDB does not have the scale and speed of a native graph database. > > > 1. Alternative (not TDB) graph DB > > * Is it possible > > Yes. > > 1/ Use SPARQL (interface RDFConnection) to connect to a remote triple > store. SPARQL tripe stores are very good at implementing the standards. > > 2/ See if the store of your choice offers a Jena adapter. > > Andy > > > * If not, can it easily be done? > > > > Regards, > > Stefan > > > >
