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Hibernate Framework. Hibernate is a Java framework that simplifies the development of Java application to interact with the database. It is an open source, lightweight, ORM (Object Relational Mapping) tool. Hibernate implements the specifications of JPA (Java Persistence API) for data persistence.
The Hibernate architecture is categorized in four layers. This is the high level architecture of Hibernate with mapping file and configuration file. Hibernate framework uses many objects such as session factory, session, transaction etc. alongwith existing Java API such as JDBC (Java Database Connectivity), JTA (Java Transaction API) and JNDI ...
The hibernate application can be created with annotation. There are many annotations that can be used to create hibernate application such as @Entity, @Id, @Table etc. Hibernate Annotations are based on the JPA 2 specification and supports all the features. All the JPA annotations are defined in the javax.persistence package.
Here, we are going to create a web application with hibernate. For creating the web application, we are using JSP for presentation logic, Bean class for representing data and DAO class for database codes. As we create the simple application in hibernate, we don't need to perform any extra operations in hibernate for creating web application.
For creating the first hibernate application, we need to follow the following steps: Create the Persistent class. Create the mapping file for Persistent class. Create the Configuration file. Create the class that retrieves or stores the persistent object. Load the jar file. Run the first hibernate application by using command prompt.
Hibernate Inheritance Mapping Tutorial. Table Per Hierarchy. Table Per Concrete class. Table Per Subclass. We can map the inheritance hierarchy classes with the table of the database. There are three inheritance mapping strategies defined in the hibernate: Table Per Hierarchy. Table Per Concrete class. Table Per Subclass.
22) What are the states of the object in hibernate? There are 3 states of the object (instance) in hibernate. Transient: The object is in a transient state if it is just created but has no primary key (identifier) and not associated with a session. Persistent: The object is in a persistent state if a session is open, and you just saved the ...
Hibernate Query Language (HQL) is same as SQL (Structured Query Language) but it doesn't depends on the table of the database. Instead of table name, we use class name in HQL. So it is database independent query language. Advantage of HQL. There are many advantages of HQL. They are as follows: database independent; supports polymorphic queries
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We can map many to many relation either using list, set, bag, map etc. Here, we are going to use list for many-to-many mapping. In such case, three tables will be created. Example of Many to Many Mapping. In this example, we will generate a many to many relation between questions and answers by list. 1) Create the Persistent class.
