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VersionValue (Hibernate API Documentation) - Hibernate 3.2.3 正式版 API 英文文档

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org.hibernate.engine
Class VersionValue

java.lang.Object
  org.hibernate.engine.VersionValue

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public class VersionValue

extends Object

A strategy for determining if a version value is an version of a new transient instance or a previously persistent transient instance. The strategy is determined by the unsaved-value attribute in the mapping file.

Author:

Gavin King

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Field Summary
static VersionValue	NEGATIVE           Assume the transient instance is newly instantiated if the version is negative, otherwise assume it is a detached instance.
static VersionValue	NULL           Assume the transient instance is newly instantiated if the version is null, otherwise assume it is a detached instance.
static VersionValue	UNDEFINED           Assume the transient instance is newly instantiated if the version is null, otherwise defer to the identifier unsaved-value.

 

Constructor Summary
protected	VersionValue()
	VersionValue(Object value)           Assume the transient instance is newly instantiated if its version is null or equal to value

 

Method Summary
Object	getDefaultValue(Object currentValue)
Boolean	isUnsaved(Object version)           Does the given version belong to a new instance?
String	toString()

 

Methods inherited from class java.lang.Object

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

 

Field Detail

NULL

public static final VersionValue NULL

Assume the transient instance is newly instantiated if the version is null, otherwise assume it is a detached instance.

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UNDEFINED

public static final VersionValue UNDEFINED

Assume the transient instance is newly instantiated if the version is null, otherwise defer to the identifier unsaved-value.

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NEGATIVE

public static final VersionValue NEGATIVE

Assume the transient instance is newly instantiated if the version is negative, otherwise assume it is a detached instance.

Constructor Detail

VersionValue

protected VersionValue()

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VersionValue

public VersionValue(Object value)

Assume the transient instance is newly instantiated if its version is null or equal to value

Parameters:

value - value to compare to

Method Detail

isUnsaved

public Boolean isUnsaved(Object version)
                  throws MappingException

Does the given version belong to a new instance?

Parameters:

version - version to check

Returns:

true is unsaved, false is saved, null is undefined

Throws:

MappingException

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getDefaultValue

public Object getDefaultValue(Object currentValue)

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toString

public String toString()

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