SequenceHiLoGenerator (Hibernate API Documentation) - Hibernate 2.1.8 正式版 API 英文文档

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net.sf.hibernate.id
Class SequenceHiLoGenerator

java.lang.Object
  net.sf.hibernate.id.SequenceGenerator
      net.sf.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 net.sf.hibernate.id.SequenceGenerator

PARAMETERS, SEQUENCE

Fields inherited from interface net.sf.hibernate.id.PersistentIdentifierGenerator

PK, SCHEMA, TABLE

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 net.sf.hibernate.id.SequenceGenerator

generatorKey, sqlCreateStrings, sqlDropString

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 SQLException,
                             HibernateException

Description copied from interface: IdentifierGenerator

Generate a new identifier.

Specified by:: generate in interface IdentifierGenerator
Overrides:: generate in class SequenceGenerator

Throws:: SQLException; HibernateException