Page 2 - Domain Model News Today

According to [PoEAA], this definition is "A Domain Model creates a web of interconnected objects, where each object represents some meaningful individual, whether as large as a corporation or as small as a single line on an order form." Domain Model has two kinds of type: Simple Domain Model: Every domain model can be mapped to one database table. Usually it uses Active Record. Complex Domain Model: The model uses inheritance, strategies and other design patterns. Database can not directly map...

According to [PoEAA], this definition is "A Transaction Script organizes all this logic primarily as a single procedure, making calls directly to the database or through a thin database wrapper." For example, when I buy a book on a ecommerce shop, the system executes a series of action, including receiving a book id and customer session, getting a book detail and customer detail from the database, and inserting an order into the database. These actions are organized in a transaction script. Us...

Avoiding NullPointerException In this article, well explore the main techniques to fight it: the self-validating model and the Optional wrapper. by The terrible NullPointerException (NPE in short) is the most frequent Java exception occurring in production, according to a 2016 study. In this article, well explore the main techniques to fight it: the self-validating model and the Optional wrapper. Self-Validating Model Imagine a business rule: every Customer has to have a birth date set. Ther...