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

Database References

Constructor Summary

Constructors

Constructor and Description
DBRef(DB db, BSONObject o) Deprecated. Deprecated because DBRefBase.fetch() is deprecated. Use DBRef(String, Object) instead
DBRef(DB db, String ns, Object id) Deprecated. Deprecated because DBRefBase.fetch() is deprecated. Use DBRef(String, Object) instead
DBRef(String ns, Object id) Creates a DBRef.

Method Summary

Modifier and Type	Method and Description
static DBObject	fetch(DB db, DBObject ref) Deprecated. use DBCollection.findOne(Object) instead

Methods inherited from class com.mongodb.DBRefBase

equals, fetch, getCollectionName, 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(String ns,
             Object id)

Creates a DBRef.

Parameters:

ns - the namespace where the object is stored

id - the object id

DBRef

@Deprecated
public DBRef(DB db,
                         BSONObject o)

Deprecated. Deprecated because DBRefBase.fetch() is deprecated. Use DBRef(String, Object) instead

Creates a DBRef.

Parameters:

db - the database

o - a BSON object representing the reference

DBRef

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

Deprecated. Deprecated because DBRefBase.fetch() is deprecated. Use DBRef(String, Object) instead

Creates a DBRef.

Parameters:

db - the database

ns - the namespace where the object is stored

id - the object id

Method Detail

fetch

@Deprecated
public static DBObject fetch(DB db,
                                         DBObject ref)

Deprecated. use DBCollection.findOne(Object) instead

Fetches a referenced object from the database.

Parameters:

db - the database

ref - the reference

Returns:

the referenced document

Throws:

MongoException