while loop is not working properly why

[Navneet Mathpal]

cursor is not going inside the while why??


public void fetch_data() throws Exception
{
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("relevancy_data");
DBCollection collection = db.getCollection("relevancy");

BasicDBObject andQuery = new BasicDBObject();
List<BasicDBObject> obj = new ArrayList<BasicDBObject>();
obj.add(new BasicDBObject("Platform","ElasticSearch"));
obj.add(new BasicDBObject("Enviroment", "Developer"));
obj.add(new BasicDBObject("Test_name", "Search_apple"));
andQuery.put("$and", obj);

System.out.println(obj.size());
//System.out.println(andQuery.toString());

DBCursor cursor = collection.find(andQuery);

while (cursor.hasNext()) {
System.out.println("inside of while");
System.out.println(cursor.next());
}
System.out.println("outside of while");


}

 

[Daniel Pitts]

cursor is not going inside the while why??


public void fetch_data() throws Exception
{
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("relevancy_data");
DBCollection collection = db.getCollection("relevancy");

BasicDBObject andQuery = new BasicDBObject();
List<BasicDBObject> obj = new ArrayList<BasicDBObject>();
obj.add(new BasicDBObject("Platform","ElasticSearch"));
obj.add(new BasicDBObject("Enviroment", "Developer"));
obj.add(new BasicDBObject("Test_name", "Search_apple"));
andQuery.put("$and", obj);

System.out.println(obj.size());
//System.out.println(andQuery.toString());

DBCursor cursor = collection.find(andQuery);

while (cursor.hasNext()) {
System.out.println("inside of while");
System.out.println(cursor.next());
}
System.out.println("outside of while");


}

The while loop is working properly. My guess is that cursor.hasNext()
returns false.

 

[Roedy Green]

while (cursor.hasNext()) {

I suggest you add out.println( cursor.hasNext() );
just prior to the while.