org.hibernate.id
Class SequenceHiLoGenerator

java.lang.Object
  org.hibernate.id.SequenceGenerator
      org.hibernate.id.SequenceHiLoGenerator

All Implemented Interfaces:

Configurable, IdentifierGenerator, PersistentIdentifierGenerator

public class SequenceHiLoGenerator
extends SequenceGenerator

seqhilo

An IdentifierGenerator that combines a hi/lo algorithm with an underlying oracle-style sequence that generates hi values. The user may specify a maximum lo value to determine how often new hi values are fetched.

If sequences are not available, TableHiLoGenerator might be an alternative.

Mapping parameters supported: sequence, max_lo, parameters.

Author:

Gavin King

See Also:

TableHiLoGenerator

Field Summary

static String

MAX_LO

Fields inherited from class org.hibernate.id.SequenceGenerator

PARAMETERS, SEQUENCE

Fields inherited from interface org.hibernate.id.PersistentIdentifierGenerator

CATALOG, PK, SCHEMA, SQL, TABLE, TABLES

Fields inherited from interface org.hibernate.id.IdentifierGenerator

ENTITY_NAME

Constructor Summary

SequenceHiLoGenerator()

Method Summary

void	configure(Type type, Properties params, Dialect d) Configure this instance, given the value of parameters specified by the user as <param> elements.
Serializable	generate(SessionImplementor session, Object obj) Generate a new identifier.

Methods inherited from class org.hibernate.id.SequenceGenerator

generatorKey, getSequenceName, sqlCreateStrings, sqlDropStrings

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_LO

public static final String MAX_LO

See Also:

Constant Field Values

Constructor Detail

SequenceHiLoGenerator

public SequenceHiLoGenerator()

Method Detail

configure

public void configure(Type type,
                      Properties params,
                      Dialect d)
               throws MappingException

Description copied from interface: Configurable

Configure this instance, given the value of parameters specified by the user as <param> elements. This method is called just once, following instantiation.

Specified by:

configure in interface Configurable

Overrides:

configure in class SequenceGenerator

params - param values, keyed by parameter name

Throws:

MappingException

generate

public Serializable generate(SessionImplementor session,
                             Object obj)
                      throws HibernateException

Description copied from interface: IdentifierGenerator

Generate a new identifier.

Specified by:

generate in interface IdentifierGenerator

Overrides:

generate in class SequenceGenerator

obj - the entity or toplevel collection for which the id is being generated

Returns:

a new identifier

Throws:

HibernateException