有人可以在Java中提供完整的可放大游标示例吗?我使用3.0驱动程序,所有示例都显示为2.x.我的类路径中只有mongo-java-driver-3.0.0.jar。我想要获取所有文档,因为它们插入到我的封面集合中。使用3.0驱动程序的Java中的Tailable Cursor示例?
//this does not work...
MongoCollection<BasicDBObject> col = database.getCollection(colName, BasicDBObject.class);
DBCursor cur = col.find().sort(new BasicDBObject("$natural", 1))
.addOption(Bytes.QUERYOPTION_TAILABLE)
.addOption(Bytes.QUERYOPTION_AWAITDATA);
// And this does not work...
BasicDBObjectBuilder builder = BasicDBObjectBuilder.start();
builder.add("messageType","STATUS_REQUEST");
DBObject searchQuery = builder.get();
DBObject sortBy = BasicDBObjectBuilder.start("$natural", 1).get();
BasicDBObjectBuilder builderForFields = BasicDBObjectBuilder.start();
DBObject fields = builderForFields.get();
DBCursor cursor = new DBCursor(col, searchQuery, fields, ReadPreference.primary() );
cursor.sort(sortBy);
cursor.addOption(Bytes.QUERYOPTION_AWAITDATA);
cursor.addOption(Bytes.QUERYOPTION_TAILABLE);
//this does work but only returns the messageNumber field. I need the doc.
MongoCursor<Long> c = database.getCollection(colName).distinct("messageNumber", Long.class).iterator();
我看到MongoCursor接口是在3.0中添加的。这是什么和它取代DBCursor?
非常感谢
此检查新条目似乎并没有使它成为可能的。这是如何在V3中完成的?之前有DBCursor.addOption(...) – Andrew