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You now know how to write a FROM, WHERE, and ORDER BY clause. You know how to select the entities you want to retrieve instances of and the necessary expressions

attribute Attribute description. [Attribute type] <subelement> Subelement description. [Element type]

and operations to restrict and order the result. All you need now is the ability to project the data of this result to what you need in your application.

Attributes are listed first, alphabetically, followed by subelements, which are also listed alphabetically. Subelements have angle brackets (< >) around them. All attributes have a type provided. Element types are only provided for common datatypes. Consult Ant s documentation for specific information on elements when a type is not noted. Boolean attributes are considered true when their values equal on, yes, or true. Any other value is considered false. Path attributes accept platform-independent paths, using either colon (:) or semi-colon (;) as separators and either forward (/) or back slashes (\) as directory separators. Several tasks are based on a parent MatchingTask. MatchingTasks support a number of additional attributes and subelements, and are denoted by an asterisk (*).

The SELECT clause performs projection in HQL and JPA QL. It allows you to specify exactly which objects or properties of objects you need in the query result. Simple projection of entities and scalar values For example, consider the following HQL query:

id taskname description A unique task instance identifier, which can, for example, be used to refer to the task from <script>. [String] An alias for the task; useful for logging purposes, as this name is provided instead. [String] A field useful for commenting purposes, although it is not used or displayed by Ant. [String]

This is a valid HQL query, but it s invalid in JPA QL the standard requires that you use a SELECT clause. Still, the same result that is implicit from this product of Item and Bid can also be produced with an explicit SELECT clause. This query returns ordered pairs of Item and Bid instances:

Query q = session.createQuery("from Item i, Bid b"); // Query q = em.createQuery("select i, b from Item i, Bid b"); Iterator pairs = q.list().iterator(); // Iterator pairs = q.getResultList().iterator(); while ( pairs.hasNext() ) { Object[] pair = (Object[]) pairs.next(); Item item = (Item) pair[0]; Bid bid = (Bid) pair[1]; }

E.2.1

This query returns a List of Object[]. At index 0 is the Item, and at index 1 is the Bid. Because this is a product, the result contains every possible combination of Item and Bid rows found in the two underlying tables. Obviously, this query isn t useful, but you shouldn t be surprised to receive a collection of Object[] as a query result. The following explicit SELECT clause also returns a collection of Object[]s:

* MatchingTask Tasks denoted with the asterisk (*) also support the follow attributes and subelements. These tasks operate on an implicit fileset, and typically have an attribute representing the base directory of the fileset.

select i.id, i.description, i.initialPrice from Item i where i.endDate > current_date()

casesensitive excludes excludesfile followsymlinks includes includesfile <and> <contains> <custom> <date> <depend> <depth> <exclude> <excludesfile> <filename> <include> <includesfile> <majority> <none> <not> <or> <patternset> <present> <selector> <size> Case sensitivity of the file system [Boolean] Comma- or space-separated list of patterns of files that must be excluded [String] The name of a file; each line of this file is taken to be an exclude pattern [File] Indicates whether symbolic links should be followed [Boolean] Comma- or space-separated list of patterns of files to include [String] The name of a file; each line of this file is taken to be an include pattern [File] Selects files that are selected by all of the selectors it contains [Selector] Limits the files selected to only those that contain a specific string [Selector] Adds a custom selector [Selector] Selects files based on last modification timestamp [Selector] Selects files whose last modified date is later than another file.

The Object[]s returned by this query contain a Long at index 0, a String at index 1, and a BigDecimal or MonetaryAmount at index 2. These are scalar values, not entity instances. Therefore, they aren t in any persistent state, like an entity instance would be. They aren t transactional and obviously aren t checked automatically for dirty state. We call this kind of query a scalar query.