程序包 org.hibernate.criterion

类 Distinct

java.lang.Object

org.hibernate.criterion.Distinct

所有已实现的接口:

Serializable, EnhancedProjection, Projection

public class Distinct
extends Object
implements EnhancedProjection

A wrappedProjection that is a wrapper around other projections to apply distinction.

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
Distinct(Projection wrappedProjection)	Constructs a Distinct

方法概要

修饰符和类型	方法	说明
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.
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 position, 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

Distinct

public Distinct(Projection wrappedProjection)

Constructs a Distinct

参数:

wrappedProjection - The wrapped projection

方法详细资料

toSqlString

public String toSqlString(Criteria criteria,
                          int position,
                          CriteriaQuery criteriaQuery)

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).

position - 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

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

getTypes

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

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.

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.

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.

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

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.

toString

public String toString()

覆盖:

toString 在类中 Object