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while loop is not working properly why

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  while loop is not working properly why Navneet Mathpal <navneetmathpal93@gmail.com> - 2014-02-18 08:25 -0800
    Re: while loop is not working properly why Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2014-02-18 10:02 -0800
    Re: while loop is not working properly why Roedy Green <see_website@mindprod.com.invalid> - 2014-02-18 15:13 -0800

#27546 — while loop is not working properly why

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");
	
	
	}

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#27547

On 2/18/14 8:25 AM, Navneet Mathpal wrote:
>
>
>
> 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.

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#27548

On Tue, 18 Feb 2014 08:25:41 -0800 (PST), Navneet Mathpal
<navneetmathpal93@gmail.com> wrote, quoted or indirectly quoted
someone who said :

>while (cursor.hasNext()) {

I suggest you add out.println( cursor.hasNext() );
just prior to the while. 
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The future has already happened, it just isn’t evenly distributed.
~ William Gibson (born: 1948-03-17 age: 65)

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