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

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net.sf.hibernate.id
Class SequenceGenerator

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

All Implemented Interfaces:

Configurable, IdentifierGenerator, PersistentIdentifierGenerator

Direct Known Subclasses:

SequenceHiLoGenerator

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public class SequenceGenerator

extends Object

implements PersistentIdentifierGenerator, Configurable

sequence

Generates long values using an oracle-style sequence. A higher performance algorithm is SequenceHiLoGenerator.

Mapping parameters supported: sequence, parameters. The parameters parameter is appended to the create sequence DDL. For example (Oracle): INCREMENT BY 1 START WITH 1 MAXVALUE 100 NOCACHE.

Author:

Gavin King

See Also:

SequenceHiLoGenerator, TableHiLoGenerator

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Field Summary
static String	PARAMETERS
static String	SEQUENCE

 

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

PK, SCHEMA, TABLE

 

Constructor Summary

SequenceGenerator()

 

Method Summary
void	configure(Type type, Properties params, Dialect dialect)           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.
Object	generatorKey()           Return a key unique to the underlying database objects.
String[]	sqlCreateStrings(Dialect dialect)           The SQL required to create the underlying database objects.
String	sqlDropString(Dialect dialect)           The SQL required to remove the underlying database objects.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

SEQUENCE

public static final String SEQUENCE

See Also:

Constant Field Values

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PARAMETERS

public static final String PARAMETERS

See Also:

Constant Field Values

Constructor Detail

SequenceGenerator

public SequenceGenerator()

Method Detail

configure

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

Parameters:

params - param values, keyed by parameter name

Throws:

MappingException

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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

Parameters:

session -

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

Returns:

Serializable a new identifier

Throws:

SQLException

HibernateException

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sqlCreateStrings

public String[] sqlCreateStrings(Dialect dialect)
                          throws HibernateException

Description copied from interface: PersistentIdentifierGenerator

The SQL required to create the underlying database objects.

Specified by:

sqlCreateStrings in interface PersistentIdentifierGenerator

Parameters:

dialect -

Returns:

String[]

Throws:

HibernateException

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sqlDropString

public String sqlDropString(Dialect dialect)
                     throws HibernateException

Description copied from interface: PersistentIdentifierGenerator

The SQL required to remove the underlying database objects.

Specified by:

sqlDropString in interface PersistentIdentifierGenerator

Parameters:

dialect -

Returns:

String

Throws:

HibernateException

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generatorKey

public Object generatorKey()

Description copied from interface: PersistentIdentifierGenerator

Return a key unique to the underlying database objects. Prevents us from trying to create/remove them multiple times.

Specified by:

generatorKey in interface PersistentIdentifierGenerator

Returns:

Object an identifying key for this generator

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