-
- Type Parameters:
T- the type of the expression
- All Superinterfaces:
- Selection<T>, TupleElement<T>
- All Known Subinterfaces:
- CollectionJoin<Z,E>, CriteriaBuilder.Case<R>, CriteriaBuilder.Coalesce<T>, CriteriaBuilder.In<T>, CriteriaBuilder.SimpleCase<C,R>, From<Z,X>, Join<Z,X>, ListJoin<Z,E>, MapJoin<Z,K,V>, ParameterExpression<T>, Path<X>, PluralJoin<Z,C,E>, Predicate, Root<X>, SetJoin<Z,E>, Subquery<T>
public interface Expression<T> extends Selection<T>
Type for query expressions.- Since:
- Java Persistence 2.0
-
-
Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description <X> Expression<X>as(Class<X> type)Perform a typecast upon the expression, returning a new expression object.Predicatein(Collection<?> values)Create a predicate to test whether the expression is a member of the collection.Predicatein(Expression<?>... values)Create a predicate to test whether the expression is a member of the argument list.Predicatein(Expression<Collection<?>> values)Create a predicate to test whether the expression is a member of the collection.Predicatein(Object... values)Create a predicate to test whether the expression is a member of the argument list.PredicateisNotNull()Create a predicate to test whether the expression is not null.PredicateisNull()Create a predicate to test whether the expression is null.-
Methods inherited from interface javax.persistence.criteria.Selection
alias, getCompoundSelectionItems, isCompoundSelection
-
Methods inherited from interface javax.persistence.TupleElement
getAlias, getJavaType
-
-
-
-
Method Detail
-
isNull
Predicate isNull()
Create a predicate to test whether the expression is null.- Returns:
- predicate testing whether the expression is null
-
isNotNull
Predicate isNotNull()
Create a predicate to test whether the expression is not null.- Returns:
- predicate testing whether the expression is not null
-
in
Predicate in(Object... values)
Create a predicate to test whether the expression is a member of the argument list.- Parameters:
values- values to be tested against- Returns:
- predicate testing for membership
-
in
Predicate in(Expression<?>... values)
Create a predicate to test whether the expression is a member of the argument list.- Parameters:
values- expressions to be tested against- Returns:
- predicate testing for membership
-
in
Predicate in(Collection<?> values)
Create a predicate to test whether the expression is a member of the collection.- Parameters:
values- collection of values to be tested against- Returns:
- predicate testing for membership
-
in
Predicate in(Expression<Collection<?>> values)
Create a predicate to test whether the expression is a member of the collection.- Parameters:
values- expression corresponding to collection to be tested against- Returns:
- predicate testing for membership
-
as
<X> Expression<X> as(Class<X> type)
Perform a typecast upon the expression, returning a new expression object. This method does not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure.- Parameters:
type- intended type of the expression- Returns:
- new expression of the given type
-
-
Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/criteria/expression.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author of this site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.