接口的使用
org.hibernate.criterion.Projection

使用Projection的程序包

程序包	说明
org.hibernate	This package defines the central Hibernate APIs.
org.hibernate.criterion	A framework for defining restriction criteria and order criteria.
org.hibernate.internal	An internal package containing mostly implementations of central Hibernate APIs.

org.hibernate中Projection的使用

参数类型为Projection的org.hibernate中的方法

修饰符和类型	方法	说明
Criteria	Criteria.setProjection(Projection projection)	Used to specify that the query results will be a projection (scalar in nature).

org.hibernate.criterion中Projection的使用

org.hibernate.criterion中Projection的子接口

修饰符和类型	接口	说明
interface	EnhancedProjection	An "enhanced" Projection for a Criteria query.

实现Projection的org.hibernate.criterion中的类

修饰符和类型	类	说明
class	AggregateProjection	Base class for standard aggregation functions.
class	AliasedProjection	Represents a projection that specifies an alias
class	AvgProjection	An avg() projection
class	CountProjection	A count projection
class	Distinct	A wrappedProjection that is a wrapper around other projections to apply distinction.
class	IdentifierProjection	A property value, or grouped property value
class	ProjectionList	A projection that wraps other projections to allow selecting multiple values.
class	Property	A factory for property-specific criterion and projection instances
class	PropertyProjection	A property value, or grouped property value
class	RowCountProjection	A row count
class	SimpleProjection	A single-column projection that may be aliased
class	SQLProjection	A SQL fragment.

返回Projection的org.hibernate.criterion中的方法

修饰符和类型	方法	说明
static Projection	Projections.alias(Projection projection, String alias)	Assign an alias to a projection, by wrapping it
Projection	SimpleProjection.as(String alias)	Create an aliased form of this projection
static Projection	Projections.distinct(Projection projection)	Create a distinct projection from a projection.
Projection	ProjectionList.getProjection(int i)	Access a wrapped projection by index
static Projection	Projections.rowCount()	The query row count, ie.
static Projection	Projections.sqlGroupProjection(String sql, String groupBy, String[] columnAliases, Type[] types)	A grouping SQL projection, specifying both select clause and group by clause fragments
static Projection	Projections.sqlProjection(String sql, String[] columnAliases, Type[] types)	A SQL projection, a typed select clause fragment

参数类型为Projection的org.hibernate.criterion中的方法

修饰符和类型	方法	说明
ProjectionList	ProjectionList.add(Projection projection)	Add a projection to this list of projections
ProjectionList	ProjectionList.add(Projection projection, String alias)	Adds a projection to this list of projections after wrapping it with an alias
static Projection	Projections.alias(Projection projection, String alias)	Assign an alias to a projection, by wrapping it
static Projection	Projections.distinct(Projection projection)	Create a distinct projection from a projection.
DetachedCriteria	DetachedCriteria.setProjection(Projection projection)	Set the projection to use.

参数类型为Projection的org.hibernate.criterion中的构造器

构造器	说明
AliasedProjection(Projection projection, String alias)
Distinct(Projection wrappedProjection)	Constructs a Distinct

org.hibernate.internal中Projection的使用

返回Projection的org.hibernate.internal中的方法

修饰符和类型	方法	说明
Projection	CriteriaImpl.getProjection()

参数类型为Projection的org.hibernate.internal中的方法

修饰符和类型	方法	说明
Criteria	CriteriaImpl.setProjection(Projection projection)
Criteria	CriteriaImpl.Subcriteria.setProjection(Projection projection)