The entities are represented as classes that are mapped manually to the relational tables. The code is hidden from the business logic using specific design patterns. This approach is successful for applications with a...
The entire application, including the user interface, is designed around the relational model and SQL-based relational operations.
There are four levels defined for ORM quality. i. Pure relational ii. Light object mapping iii. Medium object mapping iv. Full object mapping
It should have an API for performing basic CRUD (Create, Read, Update, Delete) operations on objects of persistent classes Should have a language or an API for specifying queries that refer to the classes...
ORM stands for Object/Relational mapping. It is the programmed and translucent perseverance of objects in a Java application in to the tables of a relational database using the metadata that describes the mapping between...
Hibernate is a powerful, high performance object/relational persistence and query service. This lets the users to develop persistent classes following object-oriented principles such as association, inheritance, polymorphism, composition, and collections.
Associations that are related to container management persistence are called managed associations. These are bi-directional associations. Coming to hibernate associations, these are unidirectional.
Inheritance hierarchy is represented as below. Table per concrete class. Table per class hierarchy. Table per subclass.
There are three methods by which an object can be identified. Object identity – Objects are identical if they reside in the same memory location in the JVM. This can be checked by using...
XDoclet has brought the concept of attribute-oriented programming to Java. Until JDK 1.5, the Java language had no support for annotations; now XDoclet uses the Javadoc tag format (@attribute) to specify class-, field-, or...
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