Ejemplo: mongodb comprobar si el campo existe java
DBObject query;
query = new BasicDBObject("fields_name", new BasicDBObject("$exists", true));
DBCursor result = collection.find(query);¡Haz clic para puntuar esta entrada!
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DBObject query;
query = new BasicDBObject("fields_name", new BasicDBObject("$exists", true));
DBCursor result = collection.find(query);