程序包 org.hibernate.tuple

类 UpdateTimestampGeneration

java.lang.Object

org.hibernate.tuple.UpdateTimestampGeneration

所有已实现的接口:

Serializable, AnnotationValueGeneration<UpdateTimestamp>, ValueGeneration

public class UpdateTimestampGeneration
extends Object
implements AnnotationValueGeneration<UpdateTimestamp>

Value generation implementation for UpdateTimestamp.

作者:

Gunnar Morling

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
UpdateTimestampGeneration()

方法概要

修饰符和类型	方法	说明
String	getDatabaseGeneratedReferencedColumnValue()	For values which are generated in the database (ValueGeneration.getValueGenerator() == null), if the column will be referenced in the SQL (ValueGeneration.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.
void	initialize(UpdateTimestamp annotation, Class<?> propertyType)	Initializes this generation strategy for the given annotation instance.
boolean	referenceColumnInSql()	For values which are generated in the database (ValueGeneration.getValueGenerator() == null), should the column be referenced in the INSERT / UPDATE SQL?

从类继承的方法 java.lang.Object

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

构造器详细资料

UpdateTimestampGeneration

public UpdateTimestampGeneration()

方法详细资料

initialize

public void initialize(UpdateTimestamp annotation,
                       Class<?> propertyType)

从接口复制的说明: AnnotationValueGeneration

Initializes this generation strategy for the given annotation instance.

指定者:

initialize 在接口中 AnnotationValueGeneration<UpdateTimestamp>

参数:

annotation - an instance of the strategy's annotation type. Typically implementations will retrieve the annotation's attribute values and store them in fields.

propertyType - the type of the property annotated with the generator annotation. Implementations may use the type to determine the right ValueGenerator to be applied.

getGenerationTiming

public GenerationTiming getGenerationTiming()

从接口复制的说明: ValueGeneration

When is this value generated : NEVER, INSERT, ALWAYS (INSERT+UPDATE)

指定者:

getGenerationTiming 在接口中 ValueGeneration

返回:

When the value is generated.

getValueGenerator

public ValueGenerator<?> getValueGenerator()

从接口复制的说明: ValueGeneration

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

指定者:

getValueGenerator 在接口中 ValueGeneration

返回:

The strategy for performing in-VM value generation

referenceColumnInSql

public boolean referenceColumnInSql()

从接口复制的说明: ValueGeneration

For values which are generated in the database (ValueGeneration.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

指定者:

referenceColumnInSql 在接口中 ValueGeneration

返回:

true indicates the column should be included in the SQL.

getDatabaseGeneratedReferencedColumnValue

public String getDatabaseGeneratedReferencedColumnValue()

从接口复制的说明: ValueGeneration

For values which are generated in the database (ValueGeneration.getValueGenerator() == null), if the column will be referenced in the SQL (ValueGeneration.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 ('?')

指定者:

getDatabaseGeneratedReferencedColumnValue 在接口中 ValueGeneration

返回:

The column value to be used in the SQL.