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Configuring Glassfish Server 4 with Eclipse to Build, Test, and Deploy Java EE 7 Applications

We will download and install Java EE 7 SDK which comes with GlassFish Open Source Edition 4 (currently 4.1.1)and then configure eclipse to deploy Java EE applications directly to GlassFish Server. You can download the latest Java EE 7 SDK from http://www.oracle.com/technetwork/java/javaee/downloads/index.html. You can also directly download the latest commercially supported GlassFish Server distribution (currently 3.1.2.2) from the same link.

Querying Using Criteria API in Hibernate 4.3

Hibernate provide Criteria Queries as an object-oriented alternative to HQL. Criteria Query is used to modify the objects and provide restriction for the objects. Many complex queries in HQL or even SQL may become larger over a period of time and spread over many lines; and will be difficult to update and maintain. We have already seen HQL in http://javajee.com/introduction-to-hibernate-query-language-hql-in-hibernate-43.

Named Queries in HQL with hibernate 4.3

We can have queries saved with a name and later we can retrieve them simply using that name. We use @NamedQuery annotation to declare a named query. We can also have a named query for native sql. For native SQL we use the annotation @NamedNativeQuery annotation. This is one of the important advantages of having a named query: you can write native SQL. You can retrieve a Query object from a saved query name (hql and native named query) using session.getNamedQuery method.

Parameter Binding in HQL using hibernate 4.3

Parameter binding is the process of binding a Java variable with an HQL statement. Using Parameter binding and not string concatenation for HQL statement creation will also guard against attacks like SQL injection.

Introduction to Hibernate Query Language (HQL) in hibernate 4.3

Hibernate provides a query language called Hibernate Query Language (HQL). HQL is similar to SQL in syntax, but HQL queries are written against Hibernate's entity objects, not database tables. Hibernate also provide Criteria Queries as an object-oriented alternative to HQL. Criteria Query is used to modify the objects and provide the restriction for the objects. Here we will see the basics of HQL and later in another tutorial we will see criteria queries.

[Example-Lab] Joined Inheritance Strategy in Hibernate 4.3

In the JOINED strategy, hibernate will create a separate table for all the classes in an inheritance hierarchy, and the tables are normalized. Columns that you receive as part of inheritance will be part of parent class and referred from subclass tables using a foreign key. 

In this example, we will create and save three entity classes – Shape, Rectangle and Circle; where Rectangle and Circle extends from Shape.

[Example-Lab] Table Per Class Inheritance Strategy in Hibernate 4.3

In the TABLE_PER_CLASS strategy, hibernate will create a separate table for all the classes in an inheritance hierarchy. It is still not normalized completely as inherited columns are repeated in all tables. For instance, Fields inherited from Shape such as id and fillcolor are repeated in all the tables.

In this example, we will create and save three entity classes – Shape, Rectangle and Circle; where Rectangle and Circle extends from Shape.

[Example-Lab] Single Table Inheritance Strategy in Hibernate 4.3

In the SINGLE_TABLE strategy, hibernate will create a single table for all the classes in an inheritance hierarchy. There will be a discriminator column that tells us the class to which that row belongs.

In this example, we will create and save three entity classes – Shape, Rectangle and Circle; where Rectangle and Circle extends from Shape.

Mappings in Hibernate 4.3

When referencing entities from other entities, we are mapping two entities whereas when referencing a value type we are embedding (or containing) a value type within an entity.

When mapping two entities, we annotate both classes as @Entity, and the mapping type is specified using the annotations @OneToOne, @OneToMany, @ManyToOne or @ManyToMany, over the reference variable declaration of an entity in another entity.

We will consider two entities for mapping examples – a student class and a course class.

[Example-Lab] Many-to-Many Mapping in Hibernate 4.3

In Many-To-Many mapping, we refer to a collection/list of the entity from another entity and vice versa; and used @ManyToOne annotation on declarations of both entity collections.

We will assume that each course can have many students (many to many), and each student can do many course(many to many).

We will create two entity classes, Course and Student and do a many to many mapping from course to student, and again many to many mapping from student to course.

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