Java is an object oriented programming language and its represents state as interconnected graph of objects whereas relational database management system represents data in table like format and in this course we will be persisting java object into relational database but java implements the object model where as a relational database management system implements the relational model.
Object Model
An object model defines a software system in terms of objects and classes. It uses the principle of abstraction, encapsulation, modularity, hierarchy, typing, polymorphism, concurrency and persistence. As an object is an instance of a class. It has an identity state and behavior.
In an object model system we have object as component into the system and it enable us to build well structured complex and reusable system. Object model defines the interface or interaction between different models, inheritance, encapsulation, and other object-oriented interfaces and features.
Relational Model
The relational model (RM) for database management is an approach to managing data of structure, data manipulation, and data integrity.
In a relational model data is organized in the form of tables and different tables are associated with each other by referential integrity and integrated constraint such as a primary key constraint, not null constraint, unique constraint are used to maintain entity's integrity. Relational model represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.
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