程序包 org.hibernate.criterion

类 SimpleProjection

java.lang.Object

org.hibernate.criterion.SimpleProjection

所有已实现的接口:

Serializable, EnhancedProjection, Projection

直接已知子类:

AggregateProjection, IdentifierProjection, PropertyProjection, RowCountProjection

public abstract class SimpleProjection
extends Object
implements EnhancedProjection

A single-column projection that may be aliased

作者:

Gavin King

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
SimpleProjection()

方法概要

修饰符和类型	方法	说明
Projection	as(String alias)	Create an aliased form of this projection
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	getColumnCount(Criteria criteria, CriteriaQuery criteriaQuery)	Count the number of columns this projection uses.
Type[]	getTypes(String alias, Criteria criteria, CriteriaQuery criteriaQuery)	Get the return types for a particular user-visible alias.
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

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.hibernate.criterion.Projection

getTypes, toSqlString

构造器详细资料

SimpleProjection

public SimpleProjection()

方法详细资料

as

public Projection as(String alias)

Create an aliased form of this projection

参数:

alias - The alias to apply

返回:

The aliased projection

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.

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.

getColumnCount

public int getColumnCount(Criteria criteria,
                          CriteriaQuery criteriaQuery)

Count the number of columns this projection uses.

参数:

criteria - The criteria

criteriaQuery - The query

返回:

The number of columns

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.

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

toGroupSqlString

public String toGroupSqlString(Criteria criteria,
                               CriteriaQuery criteriaQuery)

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

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.