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Projections.java API Doc Hibernate 3.2.5 3269 Tue May 31 15:24:42 BST 2005 org.hibernate.criterion

Projections

java.lang.Object

public final class Projections extends Object

The criterion package may be used by applications as a framework for building new kinds of Projection. However, it is intended that most applications will simply use the built-in projection types via the static factory methods of this class.

The factory methods that take an alias allow the projected value to be referred to by criterion and order instances.

see: org.hibernate.Criteria
see: Restrictions factory methods for Criterion instances
author: Gavin King

Fields Summary
Constructors Summary
private Projections()
//cannot be instantiated
Methods Summary
public static Projection alias(Projection projection, java.lang.String alias)
Assign an alias to a projection, by wrapping it
return new AliasedProjection(projection, alias);
public static AggregateProjection avg(java.lang.String propertyName)
A property average value
return new AvgProjection(propertyName);
public static CountProjection count(java.lang.String propertyName)
A property value count
return new CountProjection(propertyName);
public static CountProjection countDistinct(java.lang.String propertyName)
A distinct property value count
return new CountProjection(propertyName).setDistinct();
public static Projection distinct(Projection proj)
Create a distinct projection from a projection
return new Distinct(proj);
public static PropertyProjection groupProperty(java.lang.String propertyName)
A grouping property value
return new PropertyProjection(propertyName, true);
public static IdentifierProjection id()
A projected identifier value
return new IdentifierProjection();
public static AggregateProjection max(java.lang.String propertyName)
A property maximum value
return new AggregateProjection("max", propertyName);
public static AggregateProjection min(java.lang.String propertyName)
A property minimum value
return new AggregateProjection("min", propertyName);
public static ProjectionList projectionList()
Create a new projection list
return new ProjectionList();
public static PropertyProjection property(java.lang.String propertyName)
A projected property value
return new PropertyProjection(propertyName);
public static Projection rowCount()
The query row count, ie. count(*)
return new RowCountProjection();
public static Projection sqlGroupProjection(java.lang.String sql, java.lang.String groupBy, java.lang.String[] columnAliases, org.hibernate.type.Type[] types)
A grouping SQL projection, specifying both select clause and group by clause fragments
return new SQLProjection(sql, groupBy, columnAliases, types);
public static Projection sqlProjection(java.lang.String sql, java.lang.String[] columnAliases, org.hibernate.type.Type[] types)
A SQL projection, a typed select clause fragment
return new SQLProjection(sql, columnAliases, types);
public static AggregateProjection sum(java.lang.String propertyName)
A property value sum
return new AggregateProjection("sum", propertyName);