SequenceHiLoGenerator (Hibernate API Documentation) - Hibernate 3.2.4 正式版 API 英文文档

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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

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

Throws:: HibernateException