com.mongodb

Class DBRef

java.lang.Object

com.mongodb.DBRefBase

com.mongodb.DBRef

All Implemented Interfaces:

Serializable

public class DBRef
extends DBRefBase

Extends DBRefBase to understand a BSONObject representation of a reference.

While instances of this class are Serializable, deserialized instances can not be fetched, as the db property is transient.

See Also:

Serialized Form

MongoDB documentation

dbrefs

Constructor Summary

Constructors

Constructor and Description
DBRef(DB db, BSONObject o) Creates a DBRef
DBRef(DB db, String ns, Object id) Creates a DBRef

Method Summary

Methods

Modifier and Type	Method and Description
static DBObject	fetch(DB db, DBObject ref) fetches a referenced object from the database

Methods inherited from class com.mongodb.DBRefBase

equals, fetch, getDB, getId, getRef, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DBRef

public DBRef(DB db,
     BSONObject o)

Creates a DBRef

Parameters:

db - the database

o - a BSON object representing the reference

DBRef

public DBRef(DB db,
     String ns,
     Object id)

Creates a DBRef

Parameters:

db - the database

ns - the namespace where the object is stored

id - the object id

Method Detail

fetch

public static DBObject fetch(DB db,
             DBObject ref)

fetches a referenced object from the database

Parameters:

db - the database

ref - the reference

Returns:

the referenced document

Throws:

MongoException