Rebind the variables

On Thu, Jun 23, 2011 at 4:55 PM, Oda <0170003 at gmail.com> wrote: > Hi, > > I want to rebind the variables, but got the result that wasn't expected. > How can I get the expected result without creating new processor instance? > (When I use proc.query() and don't declare $var2 then > got the expected result. But I have to declare $var2.) > > ---------- > String query = > "declare variable $var1 as xs:string external; " + > "declare variable $var2 as xs:string := 'BBB'; " + > "($var1, $var2)"; > QueryProcessor proc = new QueryProcessor(query, new Context()); > > // "AAA BBB" > proc.bind("var1", "AAA"); > System.out.println(proc.execute()); > > //duplicate definition error of $var2 > //proc.query(query); > > // "AAA BBB" not "CCC BBB" > proc.bind("var1", "CCC"); > System.out.println(proc.execute()); > > proc.close(); > ---------- > > Thanks, > > Oda. > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

> Hi Oda, > > query execution in BaseX includes various optimization steps, which > might change the original quey plan. This can include the > pre-evaluation of variable bindings, which will disallow repeated > bindings. I'd recommend to create a new processor instance, which is > fast enough in most scenarios we've encountered. > > Hope this helps, > Christian > ___________________________ > > Christian Grün, BaseX > Uni KN, Box 188 > 78457 Konstanz, Germany > http://www.basex.org