bool
execution_plan_example_4(Zorba* aZorba)
{
StaticContext_t lContext = aZorba->createStaticContext();
Zorba_CompilerHints_t lHints;
std::stringstream lPredeclaredModules;
lPredeclaredModules
<< "import module namespace libjn = "
<< "'http://jsoniq.org/function-library';"
<< std::endl;
lContext->loadProlog(lPredeclaredModules.str(), lHints);
std::vector<zorba::String> lDefaultNS;
lDefaultNS.push_back("http://jsoniq.org/functions");
lContext->setDefaultFunctionNamespaces(lDefaultNS);
// the stringstream used for query materialization
std::stringstream lExecutionPlan;
// materialize a compiled query to a binary format
{
XQuery_t lQuery = aZorba->compileQuery("jn:encode-for-roundtrip(xs:dateTime('2014-05-21T00:00:01'))", lContext);
lQuery->saveExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
}
// read a compiled query from an input stream
// and execute it
{
XQuery_t lQuery = aZorba->createQuery();
lQuery->loadExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
}
return true;
}
bool
execution_plan_example_3(Zorba* aZorba)
{
// the stringstream used for query materialization
std::stringstream lExecutionPlan;
{
MySerializableExternalModule lModule;
// materialize a compiled query to a binary format
StaticContext_t sctx = aZorba->createStaticContext();
sctx->registerModule(&lModule);
std::ostringstream lText;
lText << "declare namespace foo=\"urn:foo\";" << std::endl
<< "declare function foo:bar1($a1, $a2) external;" << std::endl
<< "foo:bar1((1,2,3), (4,5,6))" << std::endl;
XQuery_t lQuery = aZorba->compileQuery(lText.str(), sctx);
lQuery->saveExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
}
// read a compiled query from an input stream
// but forgot to register a SerializationCallback
try {
XQuery_t lQuery = aZorba->createQuery();
lQuery->loadExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
} catch (ZorbaException &e) {
std::cerr << e << std::endl;
return true;
}
return false;
}
bool
execution_plan_example_1(Zorba* aZorba)
{
// the stringstream used for query materialization
std::stringstream lExecutionPlan;
// materialize a compiled query to a binary format
{
XQuery_t lQuery = aZorba->compileQuery("1+2");
lQuery->saveExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
}
// read a compiled query from an input stream
// and execute it
{
XQuery_t lQuery = aZorba->createQuery();
lQuery->loadExecutionPlan(lExecutionPlan);
std::cout << lQuery << std::endl;
}
return true;
}
bool
external_function_test_1(Zorba* aZorba)
{
try
{
// test the sausalito use case
// serialize a query and afterwards execute it
// by calling a dynamic function (i.e. using eval)
{
std::ifstream lIn("ext_main.xq");
assert(lIn.good());
std::ostringstream lOut;
MyExternalModule lMod;
{
StaticContext_t lSctx = aZorba->createStaticContext();
lSctx->registerModule(&lMod);
XQuery_t lQuery = aZorba->compileQuery(lIn, lSctx);
lQuery->saveExecutionPlan(lOut);
zorba::DynamicContext* lDynContext = lQuery->getDynamicContext();
lDynContext->setVariable("local:foo",
aZorba->getItemFactory()->createString("foo"));
// make sure constant folding doesn't happen, i.e. the function is not evaluated
if (lCalled) {
return 1;
}
// evaluate the function and check if it was really called
std::cout << lQuery << std::endl;
if (!lCalled) {
return 2;
}
}
{
MySerializationCallback lCallback;
// load the query saved above
// this tests if, when loaded, the functions of the static context
// that have not yet been compiled, can be compiled properly
std::istringstream lIn(lOut.str());
XQuery_t lQuery = aZorba->createQuery();
lQuery->loadExecutionPlan(lIn, &lCallback);
// set the parameter for evaluating a different dynamic function then
// in the test above
zorba::DynamicContext* lDynContext = lQuery->getDynamicContext();
lDynContext->setVariable("local:foo",
aZorba->getItemFactory()->createString("foo2"));
// evaluate the query
std::cout << lQuery << std::endl;
}
}
}
catch (XQueryException& qe)
{
std::cerr << qe << std::endl;
return false;
}
catch (ZorbaException& e)
{
std::cerr << e << std::endl;
return false;
}
return true;
}
