Interface Expression<T>

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 Details

    • 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