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252

SELECT clause (JPQL / Criteria API)

<Country> query = em.createQuery("SELECT c FROM Country c", Country.class); List<Country ... objects. JPA 2 adds the ability to use almost any valid JPQL expression in SELECT clauses ... - JPQL does not support the "SELECT *" expression (which is commonly used in SQL). Projection of Path
233

Criteria Query Selection and Results

The JPA Criteria API interfaces in this group are used for setting the SELECT and ORDER BY clauses and for representing query results as tuples. SELECT Clause Elements The content of the SELECT clause in a criteria query is represented by Selection: Because Selection is a super interface
85

select(selection)

Method javax.persistence.criteria.CriteriaQuery CriteriaQuery<T> select( Selection<?> selection ... selection(s), if any. Note: Applications using the string-based API may need to specify the type of the select item when it results from a get or join operation and the query result type is specified
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javax.persistence.criteria.Selection

javax.persistence.criteria Interface Selection<X> Superinterfaces: TupleElement<X> Subinterfaces ... , MapJoin, ParameterExpression, Path, PluralJoin, Predicate, Root, SetJoin, Subquery The Selection ... Criteria API's Selection in Chapter 4 of the ObjectDB/JPA manual. Selection<X> alias(String name
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multiselect(selections)

Method javax.persistence.criteria.CriteriaQuery CriteriaQuery<T> multiselect( Selection... selections ) Specify the selection items that are to be returned in the query result. Replaces the previously specified selection(s), if any. The type of the result of the query execution depends
60

array(selections)

Method javax.persistence.criteria.CriteriaBuilder CompoundSelection<Object[]> array( Selection... selections ) Create an array-valued selection item. Parameters: selections - selection items Returns: array-valued compound selection Throws: IllegalArgumentException - if an argument is a tuple- or array-valued selection item Since: JPA 2.0
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getCompoundSelectionItems()

Method javax.persistence.criteria.Selection 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
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tuple(selections)

Method javax.persistence.criteria.CriteriaBuilder CompoundSelection<Tuple> tuple( Selection... selections ) Create a tuple-valued selection item. Parameters: selections - selection items Returns: tuple-valued compound selection Throws: IllegalArgumentException - if an argument is a tuple- or array-valued selection item Since: JPA 2.0
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construct(resultClass, selections)

> resultClass, Selection... selections ) Create a selection item corresponding to a constructor. This method ... is executed. Parameters: resultClass - class whose instance is to be constructed selections - arguments to the constructor Returns: compound selection item Throws: IllegalArgumentException
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construct(resultClass, selections)

> resultClass, Selection[]<X> selections ) Create a selection item corresponding to a constructor. This method ... is executed. Parameters: resultClass - class whose instance is to be constructed selections - arguments to the constructor Returns: compound selection item Throws: IllegalArgumentException

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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