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Table 13.2 Hibernate and JPA comparison chart for chapter 13 Hibernate Core Hibernate supports fetch-plan definition with lazy loading through proxies or based on interception. Hibernate allows fine-grained control over fetch-plan and fetching strategies. Java Persistence and EJB 3.0 Hibernate implements a Java Persistence provider with proxy or interception-based lazy loading. Java Persistence standardizes annotations for fetch plan declaration, Hibernate extensions are used for fine-grained fetching strategy optimization. Use Hibernate annotations for declaration of the cache concurrency strategy on entities and collections.

The class xdoclet.doc.DocumentDocletTask exists in the JAR file referenced by the ${xdoclet.jar} property. Our build file now has the capability to use the <document> task in the same manner as any other task is used. Defining multiple tasks can be accomplished simply with multiple <taskdef> tasks, but if multiple related tasks are being used there is an alternative. Defining multiple tasks, an alternative Because task declarations are essentially name/value pairs, multiple tasks can be defined in a single properties file and loaded either directly as a properties file, or as a resource from a classpath. For example, to define two of the XDoclet tasks we could use an xdoclet_tasks.properties file as shown here:

Hibernate provides an optional second-level class and collection data cache, configured in a Hibernate configuration file or XML mapping files.

Loading this properties file by using the file variant would define both tasks, <document> and <xdoclet>, in one <taskdef>:

The next chapters deal exclusively with querying and how to write and execute HQL, JPA QL, SQL, and Criteria queries with all Hibernate and Java Persistence interfaces.

Understanding the various query options Writing HQL and JPA QL queries Joins, reporting queries, subselects

If the task definition properties file is in the classpath, then the resource variant may be used: USING THIRD-PARTY TASKS 247

Queries are the most interesting part of writing good data access code. A complex query may require a long time to get right, and its impact on the performance of the application can be tremendous. On the other hand, writing queries becomes much easier with more experience, and what seemed difficult at first is only a matter of knowing some of the more advanced features. If you ve been using handwritten SQL for a number of years, you may be concerned that ORM will take away some of the expressiveness and flexibility that you re used to. This isn t the case with Hibernate and Java Persistence. Hibernate s powerful query facilities allow you to express almost everything you commonly (or even uncommonly) need to express in SQL, but in object-oriented terms using classes and properties of classes. We ll show you the differences between native Hibernate queries and the standardized subset in Java Persistence. You may also use this chapter as a reference; hence some sections are written in a less verbose style but show many small code examples for different use cases. We also sometimes skip optimizations in the CaveatEmptor application for better readability. For example, instead of referring to the MonetaryAmount value type, we use a BigDecimal amount in comparisons. First, we show you how queries are executed. Don t let yourself be distracted by the queries; we discuss them soon.

Using the resource variant is a nice feature that is demonstrated more fully in the XDoclet chapter. It is the same mechanism that Ant uses. In Ant s ant.jar, there is a properties file named org/apache/tools/ant/taskdefs/defaults.properties with the task/class name pairs listed for all of Ant s builtin and optional tasks.

Let s start with a few examples so you understand the basic usage. In earlier chapters, we mentioned that there are three ways to express queries in Hibernate:

Unrelated tasks should be declared using individual <taskdef> s because they each have their own dependencies and classpaths. The XDoclet tasks, however, are all in the same library and have the same dependency requirements. We encourage thirdparty Ant task providers to embed a taskdef.properties file in the root folder of the distributable JAR to enable users to more easily incorporate tasks into a build.

Hibernate Query Language (HQL), and the subset standardized as JPA QL:

session.createQuery("from Category c where c.name like 'Laptop%'"); entityManager.createQuery( "select c from Category c where c.name like 'Laptop%'" );