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Are HQL and JPA QL case sensitive We never write HQL and JPA QL keywords in uppercase; we never write SQL keywords in uppercase either. It looks ugly and antiquated most modern terminals can display both uppercase and lowercase characters. However, HQL and JPA QL aren t case-sensitive for keywords, so you can write FROM Item AS item if you like shouting.

Polymorphic queries HQL and JPA QL, as object-oriented query languages, support polymorphic queries queries for instances of a class and all instances of its subclasses, respectively. You already know enough HQL and JPA QL to be able to demonstrate this. Consider the following query:

The <mkdir> task will make multiple levels of directories if they do not exist, so if only <mkdir dir="${build.classes.dir}"/> was used in the init target, both the build and build/classes directories would be created. However, because properties are designed to be overridden you cannot assume that build.classes.dir is physically under build.dir. A master build file may have forced the project to build into a different set of directories.

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This returns objects of the type BillingDetails, which is an abstract class. In this case, the concrete objects are of the subtypes of BillingDetails: CreditCard and BankAccount. If you want only instances of a particular subclass, you may use

40. Understand and utilize property rules. Properties are immutable. This fact alone can be the source of frustration for those seeking to implement variables, or the source of great flexibility when used properly. A property sticks with its first value set, and all future attempts to change it are ignored. Load properties in the desired order of precedence. The needs of the project, development team, and organization dictate the specific order required. Loading user-specific properties is a convention all projects should follow. The following code is an example of typical property ordering:

The class named in the from clause doesn t even need to be a mapped persistent class; any class will do! The following query returns all persistent objects:

<!-- Load environment variables --> <property environment="env"/> <property name="user.properties.file" location="${user.home}/.build.properties" /> <!-- Load the project specific settings --> <property file="build.properties"/> <!-- Load user specific settings --> <property file="${user.properties.file}"/>

Of course, this also works for interfaces this query returns all serializable persistent objects:

Likewise, the following criteria query returns all persistent objects (yes, you can select all the tables of your database with such a query):

This fragment loads all environment variables as Ant properties first. The user-specific properties file is mapped to an Ant property so that its location can itself be overridden, but it is not loaded until after the project-specific properties are loaded. This allows a project to have more control over its settings than a user s preference, if it is needed. 41. Base hierarchically named directory properties from the parent directory property. Don t do this:

Note that Java Persistence doesn t standardize polymorphic queries that use nonmapped interfaces. However, this works with Hibernate EntityManager. Polymorphism applies not only to classes named explicitly in the FROM clause, but also to polymorphic associations, as you ll see later in this chapter. We ve discussed the FROM clause, now let s move on to the other parts of HQL and JPA QL.

<property name="build.dir" location="build"/> <property name="build.classes" location="build/classes"/>

Usually, you don t want to retrieve all instances of a class. You must be able express constraints on the property values of objects returned by the query. This is called restriction. The WHERE clause is used to express a restriction in SQL, HQL, and JPA QL. These expressions may be as complex as you need to narrow down the piece of data you re looking for. Note that restriction doesn t only apply to SELECT statements; you also use a restriction to limit the scope of an UPDATE or DELETE operation. This is a typical WHERE clause that restricts the results to all User objects with the given email address:

Do this instead:

from User u where u.email = 'foo@hibernate.org'

<property name="build.dir" location="build"/> <property name="build.classes" location="${build.dir}/classes"/>

Notice that the constraint is expressed in terms of a property, email, of the User class, and that you use an object-oriented notion for this. The SQL generated by this query is

select u.USER_ID, u.FIRSTNAME, u.LASTNAME, u.USERNAME, u.EMAIL from USER u where u.EMAIL = 'foo@hibernate.org'

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