MojErr MojDbSearchCursor::init(const MojDbQuery& query)
{
LOG_TRACE("Entering function %s", __FUNCTION__);
MojErr err = initImpl(query);
MojErrCheck(err);
err = retrieveCollation(query);
MojErrCheck(err);
// override limit and sort since we need to retrieve everything
// and sort before re-imposing limit
m_limit = query.limit();
m_distinct = query.distinct();
if (!m_distinct.empty()) {
m_orderProp = m_distinct;
} else {
m_orderProp = query.order();
}
// retrieve page info from query.
MojDbQuery::Page page;
page = m_query.page();
if(!page.empty()) {
MojObject objOut;
err = page.toObject(objOut);
MojErrCheck(err);
m_page.fromObject(objOut);
}
m_query.limit(MaxResults);
err = m_query.order(_T(""));
MojErrCheck(err);
// delete page info from query for query plan
page.clear();
m_query.page(page);
return MojErrNone;
}
MojErr MojDbServiceHandler::findImpl(MojServiceMessage* msg, MojObject& payload, MojDbReq& req, MojDbCursor& cursor, bool doCount)
{
MojAssert(msg);
MojLogTrace(s_log);
MojObject queryObj;
MojErr err = payload.getRequired(MojDbServiceDefs::QueryKey, queryObj);
MojErrCheck(err);
bool doWatch = false;
payload.get(MojDbServiceDefs::WatchKey, doWatch);
MojDbQuery query;
err = query.fromObject(queryObj);
MojErrCheck(err);
MojUInt32 limit = query.limit();
if (limit == MojDbQuery::LimitDefault){
query.limit(MaxQueryLimit);
} else if (limit > MaxQueryLimit) {
MojErrThrowMsg(MojErrDbInvalidQuery, _T("db: limit greater than %d not allowed"), MaxQueryLimit);
}
if (doWatch) {
MojRefCountedPtr<Watcher> watcher(new Watcher(msg));
MojAllocCheck(watcher.get());
err = m_db.find(query, cursor, watcher->m_watchSlot, req);
MojErrCheck(err);
} else {
err = m_db.find(query, cursor, req);
MojErrCheck(err);
}
// append results
MojObjectVisitor& writer = msg->writer();
err = writer.beginObject();
MojErrCheck(err);
err = writer.boolProp(MojServiceMessage::ReturnValueKey, true);
MojErrCheck(err);
err = writer.propName(MojDbServiceDefs::ResultsKey);
MojErrCheck(err);
err = writer.beginArray();
MojErrCheck(err);
err = cursor.visit(writer);
MojErrCheck(err);
err = writer.endArray();
MojErrCheck(err);
// append next page
MojDbQuery::Page page;
err = cursor.nextPage(page);
MojErrCheck(err);
if (!page.empty()) {
MojObject pageObj;
err = page.toObject(pageObj);
MojErrCheck(err);
err = writer.objectProp(MojDbServiceDefs::NextKey, pageObj);
MojErrCheck(err);
}
// append count
if (doCount) {
MojUInt32 count = 0;
err = cursor.count(count);
MojErrCheck(err);
err = writer.intProp(MojDbServiceDefs::CountKey, (MojInt64) count);
MojErrCheck(err);
}
err = writer.endObject();
MojErrCheck(err);
if (doWatch) {
// if this is a watched query, it cannot be part of a batch so it's safe to reply here
err = msg->reply();
MojErrCheck(err);
}
// notifications can fire any time after the cursor is closed,
// so don't close it until after sending the reply.
err = cursor.close();
MojErrCheck(err);
return MojErrNone;
}