所有超级接口:

Serializable

所有已知子接口:

AnnotationValueGeneration<A>

所有已知实现类:

CreationTimestampGeneration, GeneratedValueGeneration, UpdateTimestampGeneration, VmValueGeneration
```
public interface ValueGeneration
extends Serializable
```
Describes the generation of property values.

作者:

Steve Ebersole

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`String`	`getDatabaseGeneratedReferencedColumnValue()`	For values which are generated in the database (`getValueGenerator()` == `null`), if the column will be referenced in the SQL (`referenceColumnInSql()` == `true`), what value should be used in the SQL as the column value.
`GenerationTiming`	`getGenerationTiming()`	When is this value generated : NEVER, INSERT, ALWAYS (INSERT+UPDATE)
`ValueGenerator<?>`	`getValueGenerator()`	Obtain the in-VM value generator.
`boolean`	`referenceColumnInSql()`	For values which are generated in the database (`getValueGenerator()` == `null`), should the column be referenced in the INSERT / UPDATE SQL?

- 方法详细资料
  - getGenerationTiming
```
GenerationTiming getGenerationTiming()
```
    When is this value generated : NEVER, INSERT, ALWAYS (INSERT+UPDATE)
    
    返回:
    
    When the value is generated.
  - getValueGenerator
```
ValueGenerator<?> getValueGenerator()
```
    Obtain the in-VM value generator.
    May return null. In fact for values that are generated "in the database" via execution of the INSERT/UPDATE statement, the expectation is that null be returned here
    
    返回:
    
    The strategy for performing in-VM value generation
  - referenceColumnInSql
```
boolean referenceColumnInSql()
```
    For values which are generated in the database (getValueGenerator() == null), should the column be referenced in the INSERT / UPDATE SQL?
    This will be false most often to have a DDL-defined DEFAULT value be applied on INSERT
    
    返回:
    
    true indicates the column should be included in the SQL.
  - getDatabaseGeneratedReferencedColumnValue
```
String getDatabaseGeneratedReferencedColumnValue()
```
    For values which are generated in the database (getValueGenerator() == null), if the column will be referenced in the SQL (referenceColumnInSql() == true), what value should be used in the SQL as the column value.
    Generally this will be a function call or a marker (DEFAULTS).
    NOTE : for in-VM generation, this will not be called and the column value will implicitly be a JDBC parameter ('?')
    
    返回:
    
    The column value to be used in the SQL.

接口 ValueGeneration

方法概要

方法详细资料

getGenerationTiming

getValueGenerator

referenceColumnInSql

getDatabaseGeneratedReferencedColumnValue