摘要:Java - MongoDB use DBRef fetch DBObject
將當初Insert的DBRef取出，並取得對映的資料物件
mongo = this.dao.getMongo(); //自行撰寫取得Mongo物件
db = this.dao.getDB(mongo); //自行撰寫取得DB物件
DBCollection collection = db.getCollection(this.collection_name); //取得Collection
BasicDBObject query = new BasicDBObject();
query.append("field_key",field_key);
DBCursor cursor = collection.find(query);
BasicDBObject object = null;
if(cursor.hasNext()) {
object = (BasicDBObject)cursor.next();
DBRef ref_obj = (DBRef)object.get("ref_obj");
BasicDBObject objRefData = (BasicDBObject)ref_obj.fetch();
}
當初insert DBRef時的方式
obj.append("ref_obj",new DBRef(db,"collection_name",obj.getString("ref_field_id")));