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:
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

    • equalTo

      Predicate equalTo(Expression<?> value)
      Create a predicate to test whether the expression is equal to the argument.
      Parameters:
      value - expression to be tested against
      Returns:
      predicate testing for equality
      Since:
      3.2

    • equalTo

      Predicate equalTo(Object value)
      Create a predicate to test whether the expression is equal to the argument.
      Parameters:
      value - value to be tested against
      Returns:
      predicate testing for equality
      Since:
      3.2

    • notEqualTo

      Predicate notEqualTo(Expression<?> value)
      Create a predicate to test whether the expression is unequal to the argument.
      Parameters:
      value - expression to be tested against
      Returns:
      predicate testing for inequality
      Since:
      3.2

    • notEqualTo

      Predicate notEqualTo(Object value)
      Create a predicate to test whether the expression is unequal to the argument.
      Parameters:
      value - value to be tested against
      Returns:
      predicate testing for inequality
      Since:
      3.2

    • 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. Unlike cast(Class), 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
      See Also:

    • cast

      <X> Expression<X> cast(Class<X> type)
      Cast this expression to the specified type, returning a new expression object. Unlike as(Class), this method does result in a runtime type conversion.

      Providers are required to support casting scalar expressions to String, and String expressions to Integer, Long, Float, and Double. Support for typecasts between other basic types is not required.

      Parameters:
      type - a basic type
      Returns:
      a scalar expression of the given basic type
      Since:
      3.2