@Test
public void testQueryBindings() throws Exception {
// Add some data to the repository
con.begin();
con.addStatement(painter, RDF.TYPE, RDFS.CLASS);
con.addStatement(painting, RDF.TYPE, RDFS.CLASS);
con.addStatement(picasso, RDF.TYPE, painter, context1);
con.addStatement(guernica, RDF.TYPE, painting, context1);
con.addStatement(picasso, paints, guernica, context1);
con.commit();
// Query 1
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(
QueryLanguage.SERQL, "select X from {X} rdf:type {Y} rdf:type {rdfs:Class}", null);
TupleExpr tupleExpr = tupleQuery.getTupleExpr();
MapBindingSet bindings = new MapBindingSet(2);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleExpr, null, bindings, false);
int resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 2, resultCount);
bindings.addBinding("Y", painter);
iter = con.evaluate(tupleExpr, null, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 1, resultCount);
bindings.addBinding("Z", painting);
iter = con.evaluate(tupleExpr, null, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 1, resultCount);
bindings.removeBinding("Y");
iter = con.evaluate(tupleExpr, null, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 2, resultCount);
// Query 2
tupleQuery =
QueryParserUtil.parseTupleQuery(
QueryLanguage.SERQL,
"select X from {X} rdf:type {Y} rdf:type {rdfs:Class} where Y = Z",
null);
tupleExpr = tupleQuery.getTupleExpr();
bindings.clear();
iter = con.evaluate(tupleExpr, null, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 0, resultCount);
bindings.addBinding("Z", painter);
iter = con.evaluate(tupleExpr, null, bindings, false);
resultCount = verifyQueryResult(iter, 1);
assertEquals("Wrong number of query results", 1, resultCount);
}
@Test
public void testAddWhileQuerying() throws Exception {
// Add some data to the repository
con.begin();
con.addStatement(painter, RDF.TYPE, RDFS.CLASS);
con.addStatement(painting, RDF.TYPE, RDFS.CLASS);
con.addStatement(picasso, RDF.TYPE, painter);
con.addStatement(guernica, RDF.TYPE, painting);
con.addStatement(picasso, paints, guernica);
con.commit();
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL, "SELECT C FROM {} rdf:type {C}", null);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
con.begin();
while (iter.hasNext()) {
BindingSet bindings = iter.next();
Value c = bindings.getValue("C");
if (c instanceof Resource) {
con.addStatement((Resource) c, RDF.TYPE, RDFS.CLASS);
}
}
con.commit();
assertEquals(3, countElements(con.getStatements(null, RDF.TYPE, RDFS.CLASS, false)));
// simulate auto-commit
tupleQuery =
QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL, "SELECT P FROM {} P {}", null);
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
while (iter.hasNext()) {
BindingSet bindings = iter.next();
Value p = bindings.getValue("P");
if (p instanceof URI) {
con.begin();
con.addStatement((URI) p, RDF.TYPE, RDF.PROPERTY);
con.commit();
}
}
assertEquals(2, countElements(con.getStatements(null, RDF.TYPE, RDF.PROPERTY, false)));
}
protected int countQueryResults(String query) throws Exception {
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(
QueryLanguage.SERQL, query + " using namespace ex = <" + EXAMPLE_NS + ">", null);
return countElements(
con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false));
}
@Test
public void testDualConnections() throws Exception {
SailConnection con2 = sail.getConnection();
try {
assertEquals(0, countAllElements());
con.begin();
con.addStatement(painter, RDF.TYPE, RDFS.CLASS);
con.addStatement(painting, RDF.TYPE, RDFS.CLASS);
con.addStatement(picasso, RDF.TYPE, painter, context1);
con.addStatement(guernica, RDF.TYPE, painting, context1);
con.commit();
assertEquals(4, countAllElements());
con2.begin();
con2.addStatement(RDF.NIL, RDF.TYPE, RDF.LIST);
String query = "SELECT S, P, O FROM {S} P {O}";
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL, query, null);
assertEquals(
5,
countElements(
con2.evaluate(
tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false)));
Runnable clearer =
new Runnable() {
public void run() {
try {
con.begin();
con.clear();
con.commit();
} catch (SailException e) {
throw new RuntimeException(e);
}
}
};
Thread thread = new Thread(clearer);
thread.start();
Thread.yield();
Thread.yield();
con2.commit();
thread.join();
} finally {
con2.close();
}
}
protected void testValueRoundTrip(Resource subj, URI pred, Value obj) throws Exception {
con.begin();
con.addStatement(subj, pred, obj);
con.commit();
CloseableIteration<? extends Statement, SailException> stIter =
con.getStatements(null, null, null, false);
try {
assertTrue(stIter.hasNext());
Statement st = stIter.next();
assertEquals(subj, st.getSubject());
assertEquals(pred, st.getPredicate());
assertEquals(obj, st.getObject());
assertTrue(!stIter.hasNext());
} finally {
stIter.close();
}
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(
QueryLanguage.SERQL,
"SELECT S, P, O FROM {S} P {O} WHERE P = <" + pred.stringValue() + ">",
null);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
try {
assertTrue(iter.hasNext());
BindingSet bindings = iter.next();
assertEquals(subj, bindings.getValue("S"));
assertEquals(pred, bindings.getValue("P"));
assertEquals(obj, bindings.getValue("O"));
assertTrue(!iter.hasNext());
} finally {
iter.close();
}
}