javax.persistence.criteria.Selection - JPA interface
javax.persistence.criteria
Interface Selection<X>
- Superinterfaces:
-
TupleElement<X>
- Subinterfaces:
-
CollectionJoin,CompoundSelection,Case,Coalesce,In,SimpleCase,Expression,From,Join,ListJoin,MapJoin,ParameterExpression,Path,PluralJoin,Predicate,Root,SetJoin,Subquery
The
Selection interface defines an item that is to be returned in a query result.
- Since:
- JPA 2.0
Learn how to use JPA Criteria API's Selection in
Chapter 4 of the ObjectDB/JPA manual.
Selection<X>
alias(String name)
Assigns an alias to the selection item. Once assigned, an alias cannot be changed or reassigned. Returns the same selection item.
- Parameters:
-
name- alias
- Returns:
- selection item
- Since:
- JPA 2.0
String
getAlias()
Return the alias assigned to the tuple element or null, if no alias has been assigned.
- Returns:
- alias
- Since:
- JPA 2.0
List<
Selection<?>>
getCompoundSelectionItems()
Return the selection items composing a compound selection. Modifications to the list do not affect the query.
- Returns:
- list of selection items
- Throws:
-
IllegalStateException- if selection is not a compound selection
- Since:
- JPA 2.0
Class<?>
getJavaType()
Return the Java type of the tuple element.
- Returns:
- the Java type of the tuple element
- Since:
- JPA 2.0
boolean
isCompoundSelection()
Whether the selection item is a compound selection.
- Returns:
- boolean indicating whether the selection is a compound selection
- Since:
- JPA 2.0
