One-to-Many Mappings When an entity is associated with a Collection of other entities, it is most often in the form of a one-to-many mapping. For example, a department would normally have a number of employees Employee and Department relationship that we showed earlier in the section Many-to-One Mappings, only this time the relationship is bidirectional in nature. When… Read More Hibernate One-to-Many Mappings using JPA Annotation

One-to-One Mappings unidirectional One-to-One Mappings A more realistic example of a one-to-one association, however, would be an employee who has a parking space. Assuming that every employee got his or her own parking space, then we would create a one-to-one relationship from Employee to ParkingSpace We define the mapping in a similar way to the… Read More Hibernate One-to-One Mappings by example using JPA annotation

Many-to-One Mappings In our cardinality discussion of the Employee and Department relationship ,  we first thought of an employee working in a department, so we just assumed that it was a one to- one relationship.  However, when we realized that more than one employee works in the same department, we changed it to a many-to-one… Read More Hibernate Many-to-One Mappings Tutorial by example

Relationship Concepts Roles The first is the view from one side of the relationship, the second is from the other side, and the third is from a global perspective that knows about both sides. The “sides” are called roles. In every relationship there are two entities that are related to one another, and each entity is said to… Read More JPA Annotations Relationship Tutorial

Java Persistence annotations may be applied at three different levels: at the class, method, and field levels. Accessing Entity State Field AccessUsing Field Access@Entitypublic class Employee {@Id private int id;private String name;private long salary;public int getId() { return id; }public void setId(int id) { this.id = id; }public String getName() { return name; }public void setName(String… Read More JPA Annotations

Topics● What is Caching?● Hibernate caching● Second-Level Caching implementations● Second-Level Caching strategies● Hibernate performance monitoringCachingWhat is Caching?● Used for optimizing database applications.● A cache is designed to reduce traffic between your application and the database byconserving data already loaded from the database.           – Database access is necessary only when retrieving data that is not… Read More Hibernate Caching

Topics• Mapping cardinality relationship       – One-To-Many       – Many-To-Many       – One-has-Map• Mapping inheritance relationship       – One table per each concrete class implementation       – One table for each subclass       – One table for each class hierarchyMapping Cardinality Relationship ● one-to-one● many-to-one● one-to-many● many-to-manyOne to One Relationship●… Read More Hibernate Mapping Cardinality & Inheritance Relationships Tutorial

Topics• Why use Object/Relational Mapping(ORM)?• What is and Why Hibernate?• Hibernate architecture• Instance states• Persistence lifecycle operations• DAOs• Transaction• Configuration• SessionFactory• Domain class• Composite primary keyWhy Use ORM?Why Object/Relational Mapping?• A major part of any enterprise application development project is the persistence layer         – Accessing and manipulate persistent data typically with relational database• ORM… Read More Hibernate Basics

Steps for Starting the database and populating the tables Step 1: Start the database ● 3 Different options – At the command line – Through an IDE – As windows service (Not all databases support this) ● Derby within the IDE – From NetBeans, select Tools->Java DB Database- >Start Java DB Server ● HSQLDB at… Read More Step By Step Guideline for Building & Running “HelloWorld” Hibernate Application