Package com.mongodb

Class DBRef

java.lang.Object

com.mongodb.DBRef

All Implemented Interfaces:

Serializable

public class DBRef
extends Object
implements Serializable

A representation of a database reference.

See Also:

• Serialized Form

MongoDB documentation

Database References

Constructor Summary

Constructors

Constructor	Description
DBRef(String collectionName, Object id)	Construct an instance.
DBRef(String databaseName, String collectionName, Object id)	Construct an instance.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
String	getCollectionName()	Gets the name of the collection in which the referenced document is stored.
String	getDatabaseName()	Gets the name of the database in which the referenced document is stored.
Object	getId()	Gets the _id of the referenced document
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

notify, wait

Constructor Details

DBRef

public DBRef(String collectionName,
 Object id)

Construct an instance.

Parameters:

collectionName - the name of the collection where the document is stored

id - the object id

DBRef

public DBRef(@Nullable
 String databaseName,
 String collectionName,
 Object id)

Construct an instance.

Parameters:

databaseName - the name of the database where the document is stored

collectionName - the name of the collection where the document is stored

id - the object id

Since:

3.3

Method Details

getId

public Object getId()

Gets the _id of the referenced document

Returns:

the _id of the referenced document

getCollectionName

public String getCollectionName()

Gets the name of the collection in which the referenced document is stored.

Returns:

the name of the collection in which the referenced is stored

getDatabaseName

@Nullable
public String getDatabaseName()

Gets the name of the database in which the referenced document is stored. A null value implies that the referenced document is stored in the same database as the referring document.

Returns:

the possibly-null database name

Since:

3.3

equals

public boolean equals(Object o)

Overrides:

Object

hashCode

public int hashCode()

Overrides:

Object

toString

public String toString()

Overrides:

Object