org.hibernate.id
Class TableHiLoGenerator

java.lang.Object
  org.hibernate.engine.TransactionHelper
      org.hibernate.id.TableGenerator
          org.hibernate.id.TableHiLoGenerator

All Implemented Interfaces:

Configurable, IdentifierGenerator, PersistentIdentifierGenerator

public class TableHiLoGenerator
extends TableGenerator

hilo

An IdentifierGenerator that returns a Long, constructed using a hi/lo algorithm. The hi value MUST be fetched in a seperate transaction to the Session transaction so the generator must be able to obtain a new connection and commit it. Hence this implementation may not be used when the user is supplying connections. In this case a SequenceHiLoGenerator would be a better choice (where supported).

Mapping parameters supported: table, column, max_lo

Author:

Gavin King

See Also:

SequenceHiLoGenerator

Field Summary

static String

MAX_LO The max_lo parameter

Fields inherited from class org.hibernate.id.TableGenerator

COLUMN, DEFAULT_COLUMN_NAME, DEFAULT_TABLE_NAME, TABLE

Fields inherited from interface org.hibernate.id.PersistentIdentifierGenerator

CATALOG, PK, SCHEMA, SQL, TABLES

Fields inherited from interface org.hibernate.id.IdentifierGenerator

ENTITY_NAME

Constructor Summary

TableHiLoGenerator()

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.TableGenerator

doWorkInCurrentTransaction, generatorKey, sqlCreateStrings, sqlDropStrings

Methods inherited from class org.hibernate.engine.TransactionHelper

doWorkInNewTransaction

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

The max_lo parameter

See Also:

Constant Field Values

Constructor Detail

TableHiLoGenerator

public TableHiLoGenerator()

Method Detail

configure

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

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 TableGenerator

params - param values, keyed by parameter name

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 TableGenerator

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

Returns:

a new identifier

Throws:

HibernateException