程序包 org.hibernate.criterion

类 ProjectionList

java.lang.Object

org.hibernate.criterion.ProjectionList

所有已实现的接口:

Serializable, EnhancedProjection, Projection

public class ProjectionList
extends Object
implements EnhancedProjection

A projection that wraps other projections to allow selecting multiple values.

作者:

Gavin King

另请参阅:

序列化表格

构造器概要

构造器

限定符	构造器	说明
protected	ProjectionList()	Constructs a ProjectionList

方法概要

修饰符和类型	方法	说明
ProjectionList	add(Projection projection)	Add a projection to this list of projections
ProjectionList	add(Projection projection, String alias)	Adds a projection to this list of projections after wrapping it with an alias
ProjectionList	create()	已过时。 an instance factory method does not make sense
String[]	getAliases()	Get the criteria-level aliases for this projection (ie. the ones that will be passed to the ResultTransformer)
String[]	getColumnAliases(int loc)	Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery).
String[]	getColumnAliases(int loc, Criteria criteria, CriteriaQuery criteriaQuery)	Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery).
String[]	getColumnAliases(String alias, int loc)	Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery) for a particular criteria-level alias.
String[]	getColumnAliases(String alias, int loc, Criteria criteria, CriteriaQuery criteriaQuery)	Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery) for a particular criteria-level alias.
int	getLength()
Projection	getProjection(int i)	Access a wrapped projection by index
Type[]	getTypes(String alias, Criteria criteria, CriteriaQuery criteriaQuery)	Get the return types for a particular user-visible alias.
Type[]	getTypes(Criteria criteria, CriteriaQuery criteriaQuery)	Types returned by the rendered SQL fragment.
boolean	isGrouped()	Is this projection fragment (SELECT clause) also part of the GROUP BY
String	toGroupSqlString(Criteria criteria, CriteriaQuery criteriaQuery)	Render the SQL fragment to be used in the GROUP BY clause
String	toSqlString(Criteria criteria, int loc, CriteriaQuery criteriaQuery)	Render the SQL fragment to be used in the SELECT clause.
String	toString()

从类继承的方法 java.lang.Object

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

构造器详细资料

ProjectionList

protected ProjectionList()

Constructs a ProjectionList

另请参阅:

Projections.projectionList()

方法详细资料

create

@Deprecated
public ProjectionList create()

已过时。

an instance factory method does not make sense

Lol

返回:

duh

另请参阅:

Projections.projectionList()

add

public ProjectionList add(Projection projection)

Add a projection to this list of projections

参数:

projection - The projection to add

返回:

this, for method chaining

add

public ProjectionList add(Projection projection,
                          String alias)

Adds a projection to this list of projections after wrapping it with an alias

参数:

projection - The projection to add

alias - The alias to apply to the projection

返回:

this, for method chaining

另请参阅:

Projections.alias(org.hibernate.criterion.Projection, java.lang.String)

isGrouped

public boolean isGrouped()

从接口复制的说明: Projection

Is this projection fragment (SELECT clause) also part of the GROUP BY

指定者:

isGrouped 在接口中 Projection

返回:

True if the projection is also part of the GROUP BY; false otherwise.

getTypes

public Type[] getTypes(Criteria criteria,
                       CriteriaQuery criteriaQuery)
                throws HibernateException

从接口复制的说明: Projection

Types returned by the rendered SQL fragment. In other words what are the types that would represent the values this projection asked to be pulled into the result set?

指定者:

getTypes 在接口中 Projection

参数:

criteria - The local criteria to which this project is attached (for resolution).

criteriaQuery - The overall criteria query instance.

返回:

The return types.

抛出:

HibernateException - Indicates a problem resolving the types

toSqlString

public String toSqlString(Criteria criteria,
                          int loc,
                          CriteriaQuery criteriaQuery)
                   throws HibernateException

从接口复制的说明: Projection

Render the SQL fragment to be used in the SELECT clause.

指定者:

toSqlString 在接口中 Projection

参数:

criteria - The local criteria to which this project is attached (for resolution).

loc - The number of columns rendered in the SELECT clause before this projection. Generally speaking this is useful to ensure uniqueness of the individual columns aliases.

criteriaQuery - The overall criteria query instance.

返回:

The SQL fragment to plug into the SELECT

抛出:

HibernateException - Indicates a problem performing the rendering

toGroupSqlString

public String toGroupSqlString(Criteria criteria,
                               CriteriaQuery criteriaQuery)
                        throws HibernateException

从接口复制的说明: Projection

Render the SQL fragment to be used in the GROUP BY clause

指定者:

toGroupSqlString 在接口中 Projection

参数:

criteria - The local criteria to which this project is attached (for resolution).

criteriaQuery - The overall criteria query instance.

返回:

The SQL fragment to plug into the GROUP BY

抛出:

HibernateException - Indicates a problem performing the rendering

getColumnAliases

public String[] getColumnAliases(int loc)

从接口复制的说明: Projection

Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery). Hibernate always uses column aliases to extract data from the JDBC ResultSet, so it is important that these be implemented correctly in order for Hibernate to be able to extract these values correctly.

指定者:

getColumnAliases 在接口中 Projection

参数:

loc - Just as in Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery), represents the number of columns rendered prior to this projection.

返回:

The columns aliases.

getColumnAliases

public String[] getColumnAliases(int loc,
                                 Criteria criteria,
                                 CriteriaQuery criteriaQuery)

从接口复制的说明: EnhancedProjection

Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery). Hibernate always uses column aliases to extract data from the JDBC ResultSet, so it is important that these be implemented correctly in order for Hibernate to be able to extract these values correctly.

指定者:

getColumnAliases 在接口中 EnhancedProjection

参数:

loc - Just as in Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery), represents the number of columns rendered prior to this projection.

criteria - The local criteria to which this project is attached (for resolution).

criteriaQuery - The overall criteria query instance.

返回:

The columns aliases.

getColumnAliases

public String[] getColumnAliases(String alias,
                                 int loc)

从接口复制的说明: Projection

Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery) for a particular criteria-level alias.

指定者:

getColumnAliases 在接口中 Projection

参数:

alias - The criteria-level alias

loc - Just as in Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery), represents the number of columns rendered prior to this projection.

返回:

The columns aliases pertaining to a particular criteria-level alias; expected to return null if this projection does not understand this alias.

getColumnAliases

public String[] getColumnAliases(String alias,
                                 int loc,
                                 Criteria criteria,
                                 CriteriaQuery criteriaQuery)

从接口复制的说明: EnhancedProjection

Get the SQL column aliases used by this projection for the columns it writes for inclusion into the SELECT clause (Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery) for a particular criteria-level alias.

指定者:

getColumnAliases 在接口中 EnhancedProjection

参数:

alias - The criteria-level alias

loc - Just as in Projection.toSqlString(org.hibernate.Criteria, int, org.hibernate.criterion.CriteriaQuery), represents the number of columns rendered prior to this projection.

criteria - The local criteria to which this project is attached (for resolution).

criteriaQuery - The overall criteria query instance.

返回:

The columns aliases pertaining to a particular criteria-level alias; expected to return null if this projection does not understand this alias.

getTypes

public Type[] getTypes(String alias,
                       Criteria criteria,
                       CriteriaQuery criteriaQuery)

从接口复制的说明: Projection

Get the return types for a particular user-visible alias.

Differs from Projection.getTypes(org.hibernate.Criteria, CriteriaQuery) in that here we are only interested in the types related to the given criteria-level alias.

指定者:

getTypes 在接口中 Projection

参数:

alias - The criteria-level alias for which to find types.

criteria - The local criteria to which this project is attached (for resolution).

criteriaQuery - The overall criteria query instance.

返回:

The return types; expected to return null if this projection does not understand this alias.

getAliases

public String[] getAliases()

从接口复制的说明: Projection

Get the criteria-level aliases for this projection (ie. the ones that will be passed to the ResultTransformer)

指定者:

getAliases 在接口中 Projection

返回:

The aliases

getProjection

public Projection getProjection(int i)

Access a wrapped projection by index

参数:

i - The index of the projection to return

返回:

The projection

getLength

public int getLength()

toString

public String toString()

覆盖:

toString 在类中 Object