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

所有已实现的接口:

UnsavedValueStrategy
```
public class VersionValue
extends Object
implements UnsavedValueStrategy
```
A strategy for determining if a version value is a 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.

作者:

Gavin King

字段概要

字段
修饰符和类型	字段	说明
`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.

构造器概要

构造器
限定符	构造器	说明
`protected`	`VersionValue()`
	`VersionValue(Object value)`	Assume the transient instance is newly instantiated if its version is null or equal to `value`

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`Object`	`getDefaultValue(Object currentValue)`	Get a default value meant to indicate transience.
`Boolean`	`isUnsaved(Object version)`	Make the transient/detached determination
`String`	`toString()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - 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.
  - 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.
  - 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.
- 构造器详细资料
  - VersionValue
```
protected VersionValue()
```
  - VersionValue
```
public VersionValue(Object value)
```
    Assume the transient instance is newly instantiated if its version is null or equal to value
    
    参数:
    
    value - value to compare to
- 方法详细资料
  - isUnsaved
```
public Boolean isUnsaved(Object version)
                  throws MappingException
```
    从接口复制的说明: UnsavedValueStrategy
    
    Make the transient/detached determination
    
    指定者:
    
    isUnsaved 在接口中 UnsavedValueStrategy
    
    参数:
    
    version - The value to be tested
    
    返回:
    
    true indicates the value corresponds to unsaved data (aka, transient state); false indicates the value does not corresponds to unsaved data (aka, detached state); null indicates that this strategy was not able to determine conclusively.
    
    抛出:
    
    MappingException
  - getDefaultValue
```
public Object getDefaultValue(Object currentValue)
```
    从接口复制的说明: UnsavedValueStrategy
    
    Get a default value meant to indicate transience.
    
    指定者:
    
    getDefaultValue 在接口中 UnsavedValueStrategy
    
    参数:
    
    currentValue - The current state value.
    
    返回:
    
    The default transience value.
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object

类 VersionValue

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

NULL

UNDEFINED

NEGATIVE

构造器详细资料

VersionValue

VersionValue

方法详细资料

isUnsaved

getDefaultValue

toString