package conexionConMongoDB;
import java.util.Set;
import org.bson.Document;
import com.mongodb.*;
import com.mongodb.client.*;
public class ConectarConMongoDB {
public static void main(String[] args) {
MongoClient mongo = null;
MongoDatabase db = null;
MongoCollection<Document> collection = null;
MongoCursor<Document> cursor = null;
Set<String> keys = null;
//Conectar con MongoDB
mongo = CrearConexion();
//OK
if (mongo !=null){
//Abrir Base de Datos
db = AbrirBaseDeDatos(mongo);
//Abrir Coleccion
collection = AbrirColeccion(db);
//Setea cursor
cursor = collection.find().iterator();
while (cursor.hasNext())
{ Document doc = cursor.next();
keys = doc.keySet();
ScanIntoDocument(doc, keys, false);
System.out.println("\n"); }
}else { System.out.println("Error: Conexión no establecida"); }
}
/**
* CrearConexion
* @return
*/
private static MongoClient CrearConexion() {
MongoClient mongo = null;
try { mongo = new MongoClient("localhost", 27017);
} catch (Exception e) { e.printStackTrace();}
return mongo;
}
/**
* AbrirBaseDeDatos
* @param mongo
* @return
*/
private static MongoDatabase AbrirBaseDeDatos(MongoClient mongo){
return mongo.getDatabase("Nombre_de_la_DB"); }
/**
* AbrirColeccion
* @param db
* @return
*/
private static MongoCollection<Document> AbrirColeccion(MongoDatabase db){
return db.getCollection("Nombre_de_la_Coleccion"); }
/**
* ScanIntoDocument
* @param doc
* @param keys
* @param tab
*/
private static void ScanIntoDocument(Document doc, Set<String> keys, boolean tab){
Integer Numero;
for (String key : keys){ Object ob = doc.get(key);
if (ob.getClass() == Document.class) { Set<String> OneKeys = null;
Document OneDoc = (Document) doc.get(key);
OneKeys = OneDoc.keySet();
System.out.println(key + ": ");
ScanIntoDocument(OneDoc, OneKeys, true);
} else if (ob.getClass() == Double.class){ Double Ndoble = doc.getDouble(key);
Numero = Ndoble.intValue();
if (tab){ System.out.println("\t" + key + ": " + Numero.toString()); } else{ System.out.println(key + ": " + Numero.toString());
}
} else{ if (tab){ System.out.println("\t" + key + ": " + doc.get(key).toString()); } else{ System.out.println(key + ": " + doc.get(key).toString());
}
}
}
}
//
}
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