Examples of com.mongodb.DBCursor.explain()

com.mongodb.DBCursor.explain()
Returns an object containing basic information about the execution of the query that created this cursor This creates a DBObject with the key/value pairs: "cursor" : cursor type "nScanned" : number of records examined by the database for this query "n" : the number of records that the database returned "millis" : how long it took the database to execute the query @return a DBObject @dochub explain

        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");

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        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");

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        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");

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        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");

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                    }
                    if (hint != null) {
                        cur.hint(hint);
                    }
                    if (explain) {
                        return cur.explain();
                    }


                    // force cursor to start
                    cur.hasNext();
                    return cur;

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                }
                if (hint != null) {
                    cur.hint(hint);
                }
                if (explain) {
                    return cur.explain();
                }


                // force cursor to start
                cur.hasNext();
                return cur;

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   */
  public DBObject explain() {
    assertValid();
    DBCursor cursor = db.getCollection(collection).find(toQueryObject(objectMapper));
    setupCursor(cursor);
    return cursor.explain();
  }


  /**
   * Sets up a {@link DBCursor} for this query.
   * @param cursor the curor.

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        DBObject query = queryBuilder.get();
        BasicDBObject keys = new BasicDBObject();
        keys.put("_id", 1);
        DBCursor cursor = nodes.find(query, keys);
        int count = 0;
        log("Query plan: " + cursor.explain());
        long time = System.currentTimeMillis();
        while (cursor.hasNext()) {
            DBObject obj = cursor.next();
            // dummy read operation (to ensure we did get the data)
            obj.get("_id");

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        return null;
    }


    public Map<String, Object> explain() {
        DBCursor cursor = prepareCursor();
        return (BasicDBObject) cursor.explain();
    }
}

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