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The Criteria and Example APIs are available in Hibernate only; Java Persistence doesn t standardize these interfaces. As mentioned earlier, it seems likely that other vendors, not only Hibernate, support a similar extension interface and that a future version of the standard will include this functionality. Querying with programmatically generated criteria and example objects is often the preferred solution when queries get more complex. This is especially true if you have to create a query at runtime. Imagine that you have to implement a search mask in your application, with many check boxes, input fields, and switches the user can enable. You must create a database query from the user s selection. The traditional way to do this is to create a query string through concatenation, or maybe to write a query builder that can construct the SQL query string for you. You d run into the same problem if you d try to use HQL or JPA QL in this scenario. The Criteria and Example interfaces allow you to build queries programmatically by creating and combining objects in the right order. We now show you how

debug extraoptions failonerror keyfile listing outputfile resourcefile srcdir targettype verbose Debug flag on or off. [Boolean] Any extra options that are not explicitly supported by this task. [String] If true, fails if ilasm tool fails. [Boolean] The name of a file containing a private key. [File] If true, produces a listing; default is false. [Boolean] Output file. [File] Name of resource file to include. [File] Source directory containing the files to be compiled. [File] Type of target, either exe or library. [String] If true, enables verbose ilasm output. [Boolean]

to work with these APIs, and how to express selection, restriction, joins, and projection. We assume that you ve read the previous chapter and that you know how these operations are translated into SQL. Even if you decide to use the Criteria and Example APIs as your primary way to write queries, keep in mind that HQL and JPA QL are always more flexible due to their string-based nature. Let s start with some basic selection and restriction examples.

The simplest criteria query looks like this:

addproperty message validargs Defines the name of a property to be created from input. [String] Message that gets displayed to the user during the build run. [String] Defines valid input parameters as comma-separated strings. [String]

session.createCriteria(Item.class);

classpath debug dest ejbdescriptor iasdescriptor iashome keepgenerated <classpath> Classpath to be used when compiling the EJB stubs and skeletons. [Path] If true, debugging output will be generated when ejbc is executed. [Boolean] Destination directory where the EJB source classes must exist and where the stubs and skeletons will be written. [File] Location of the standard XML EJB descriptor. [File] Location of the iAS-specific XML EJB descriptor. [File] May be used to specify the home directory for this iAS installation. [File] If true, the Java source files generated by ejbc will be saved. [Boolean] Adds to the classpath used when compiling the EJB stubs and skeletons. [Path]

It retrieves all persistent instances of the Item class. This is also called the root entity of the criteria query. Criteria queries also support polymorphism:

<jar>*

session.createCriteria(BillingDetails.class);

basedir compress destfile duplicate encoding filesonly index manifest update whenempty <fileset> <manifest> <metainf> <zipfileset> <zipgroupfileset> Directory from which to archive files; optional. [File] Sets whether to compress the files or only store them; optional, default is true. [Boolean] The file to create; required. [File] Sets behavior for when a duplicate file is about to be added. [add, preserve, fail] Encoding to use for file names, defaults to the platform s default encoding. [String] If true, emulates Sun s JAR utility by not adding parent directories; optional, defaults to false. [Boolean] Sets whether to create an index list for classes. [Boolean] The manifest file to use. [File] If true, updates an existing file, otherwise overwrites any existing one; optional, defaults to false. [Boolean] Sets behavior of the task when no files match. [fail, skip, create] Adds a set of files. [Fileset] Allows the manifest for the archive file to be provided inline in the build file rather than in an external file. Adds a zipfileset to include in the META-INF directory. [ZipFileset] Adds a set of files that can be read from an archive and be given a prefix/full path. [ZipFileset] Adds a group of Zip files. [Fileset]

This query returns instances of BillingDetails and its subclasses. Likewise, the following criteria query returns all persistent objects:

session.createCriteria(java.lang.Object.class);

file property <extension> <extensionset> The JAR library to check. [File] The name of property to set if extensions are available. [String] Extension to look for. Adds a set of extensions to search in.

The Criteria interface also supports ordering of results with the addOrder() method and the Order criterion:

Displays the Optional Package and Package Specification information contained within the specified JARs.

session.createCriteria(User.class) .addOrder( Order.asc("lastname") ) .addOrder( Order.asc("firstname") );

file <fileset> The JAR library to display information for. [File] Adds a set of files about which library data will be displayed. [Fileset]

You don t need to have an open Session to create a criteria object; a DetachedCriteria can be instantiated and later attached to a Session for execution (or to another Criteria as a subquery):

DetachedCriteria crit = DetachedCriteria.forClass(User.class) .addOrder( Order.asc("lastname") ) .addOrder( Order.asc("firstname") ); List result = crit.getExecutableCriteria(session).list();