Book Image

Java Hibernate Cookbook

By : Prajapati, Ranapariya
Book Image

Java Hibernate Cookbook

By: Prajapati, Ranapariya

Overview of this book

This book will provide a useful hands-on guide to Hibernate to accomplish the development of a real-time Hibernate application. We will start with the basics of Hibernate, which include setting up Hibernate – the pre-requisites and multiple ways of configuring Hibernate using Java. We will then dive deep into the fundamentals of Hibernate such as SessionFactory, session, criteria, working with objects and criteria. This will help a developer have a better understanding of how Hibernate works and what needs to be done to run a Hibernate application. Moving on, we will learn how to work with annotations, associations and collections. In the final chapters, we will see explore querying, advanced Hibernate concepts and integration with other frameworks.
Table of Contents (10 chapters)
9
Index

Working with an alias


An alias is useful when we want a relationship between tables and also when we want to refer to a field of the child object using a field of the parent object. So, an alias works as a bridge between them and is also used to refer to a field.

How to do it…

Let's consider one scenario. We have an Employee and Department relationship where each employee has only one department, but each department can be used multiple times for different employees. Add the following code to the respective files:

Source file: Employee.java

@Entity
@Table
public class Employee{

    @Id
    @GeneratedValue
    private long id;

    @Column
    private String name;

    @ManyToOne
    @JoinColumn
    private Department department;

    // getters and setters

}

Source file: Department.java

@Entity
@Table
public class Department{

    @Id
    @GeneratedValue
    private long id;

    @Column
    private String name;

    // getters and setters

}

Now, using the criteria of the Employee class, we...