org.apache.ojb.broker.util.sequence
Class SequenceManagerNativeImpl

java.lang.Object
  org.apache.ojb.broker.util.sequence.AbstractSequenceManager
      org.apache.ojb.broker.util.sequence.SequenceManagerNativeImpl

All Implemented Interfaces:

SequenceManager

public class SequenceManagerNativeImpl
extends AbstractSequenceManager

Sequence manager implementation using native database Identity columns (like MySQL, MSSQL, ...). For proper work some specific metadata settings needed:

• field representing the identity column need attribute autoincrement 'true'
• field representing the identity column need attribute access set 'readonly'
• field representing the identity column need attribute primarykey set 'true'
• only possible to declare one identity field per class

Note: Make sure that the DB generated identity columns represent values > 0, because negative values intern used by this implementation and 0 could cause problems with primitive FK fields.

Implementation configuration properties:

Property Key	Property Values
no properties to set

Limitations:

• Native key generation is not 'extent aware' when extent classes span several tables! Please see more in shipped docs 'extents and polymorphism' or sequence manager docs.
• Only positive identity values are allowed (see above).

Version:

$Id: SequenceManagerNativeImpl.java,v 1.1 2007-08-24 22:17:29 ewestfal Exp $

Author:

Travis Reeder, Armin Waibel

Field Summary

Fields inherited from class org.apache.ojb.broker.util.sequence.AbstractSequenceManager

GLOBAL_SEQUENCE_NAME, PROPERTY_AUTO_NAMING

Constructor Summary

SequenceManagerNativeImpl(PersistenceBroker broker)

Method Summary

void	afterStore(JdbcAccess dbAccess, ClassDescriptor cld, Object obj) noop
protected long	getUniqueLong(FieldDescriptor field) returns a negative value
protected String	lastInsertSelect(String tableName)

Methods inherited from class org.apache.ojb.broker.util.sequence.AbstractSequenceManager

calculateSequenceName, getBrokerForClass, getConfigurationProperties, getConfigurationProperty, getPlatform, getUniqueValue, setConfigurationProperties, setConfigurationProperty, setReferenceFKs, useAutoNaming

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceManagerNativeImpl

public SequenceManagerNativeImpl(PersistenceBroker broker)

Method Detail

afterStore

public void afterStore(JdbcAccess dbAccess,
                       ClassDescriptor cld,
                       Object obj)
                throws SequenceManagerException

Description copied from class: AbstractSequenceManager

noop

Specified by:

afterStore in interface SequenceManager

Overrides:

afterStore in class AbstractSequenceManager

Parameters:

dbAccess - Current used JdbcAccess instance

cld - Descriptor for specified object

obj - The object to associate with identity value

Throws:

SequenceManagerException

lastInsertSelect

protected String lastInsertSelect(String tableName)

getUniqueLong

protected long getUniqueLong(FieldDescriptor field)
                      throws SequenceManagerException

returns a negative value

Specified by:

getUniqueLong in class AbstractSequenceManager

Throws:

SequenceManagerException