Re: TDB Graph usage question

[Andy Seaborne]

Try it :-)

Then try running it twice in a JVM.

And then try TDB2 vs TDB1 vs TIM.

   Andy

On 28/12/17 23:49, Claude Warren wrote:

Would the following code snippit work

         Graph g = // a TDB graph instance
         if (g.getTransactionHandler().transactionsSupported()) {
             Graph initial = graphWith( GraphFactory.createGraphMem(),
                     "initial hasValue 42; also hasURI hello");
             Graph extra = graphWith(GraphFactory.createGraphMem(),
                     "extra hasValue 17; also hasURI world");
             GraphUtil.addInto(g, initial);
             g.getTransactionHandler().begin();
             GraphUtil.addInto(g, extra);
             g.getTransactionHandler().abort();
             assertIsomorphic(initial, g);


Notes:
     graphWith populates the graph with the triples defined in the string.
     GraphUtil.addInto() performs no transaction handling and copies the
contents of the second param into the first param.

I suspect that this will/should fail when the begin() is called as the
transaction as we are switching from not using transactions to using them.

Claude