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

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org.hibernate.id
Class TableGenerator

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

All Implemented Interfaces:

Configurable, IdentifierGenerator, PersistentIdentifierGenerator

Direct Known Subclasses:

TableHiLoGenerator

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public class TableGenerator

extends TransactionHelper

implements PersistentIdentifierGenerator, Configurable

An IdentifierGenerator that uses a database table to store the last generated value. It is not intended that applications use this strategy directly. However, it may be used to build other (efficient) strategies. The returned type is Integer.

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 Hibernate is fetching connections when the user is supplying connections.

The returned value is of type integer.

Mapping parameters supported: table, column

Author:

Gavin King

See Also:

TableHiLoGenerator

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Field Summary
static String	COLUMN           The column parameter
static String	DEFAULT_COLUMN_NAME           Default column name
static String	DEFAULT_TABLE_NAME           Default table name
static String	TABLE           The table parameter

 

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

TableGenerator()

 

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	doWorkInCurrentTransaction(Connection conn, String sql)           The work to be done
Serializable	generate(SessionImplementor session, Object object)           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[]	sqlDropStrings(Dialect dialect)           The SQL required to remove the underlying database objects.

 

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

COLUMN

public static final String COLUMN

The column parameter

See Also:

Constant Field Values

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DEFAULT_COLUMN_NAME

public static final String DEFAULT_COLUMN_NAME

Default column name

See Also:

Constant Field Values

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TABLE

public static final String TABLE

The table parameter

See Also:

Constant Field Values

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DEFAULT_TABLE_NAME

public static final String DEFAULT_TABLE_NAME

Default table name

See Also:

Constant Field Values

Constructor Detail

TableGenerator

public TableGenerator()

Method Detail

configure

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

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

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generate

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

Description copied from interface: IdentifierGenerator

Generate a new identifier.

Specified by:

generate in interface IdentifierGenerator

Parameters:

session -

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

Returns:

a new identifier

Throws:

HibernateException

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sqlCreateStrings

public String[] sqlCreateStrings(Dialect dialect)

Description copied from interface: PersistentIdentifierGenerator

The SQL required to create the underlying database objects.

Specified by:

sqlCreateStrings in interface PersistentIdentifierGenerator

Parameters:

dialect -

Returns:

String[]

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sqlDropStrings

public String[] sqlDropStrings(Dialect dialect)

Description copied from interface: PersistentIdentifierGenerator

The SQL required to remove the underlying database objects.

Specified by:

sqlDropStrings in interface PersistentIdentifierGenerator

Parameters:

dialect -

Returns:

String

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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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doWorkInCurrentTransaction

public Serializable doWorkInCurrentTransaction(Connection conn,
                                               String sql)
                                        throws SQLException

Description copied from class: TransactionHelper

The work to be done

Specified by:

doWorkInCurrentTransaction in class TransactionHelper

Throws:

SQLException

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