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[PoEAA] Domain Logic Pattern - Domain Model - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天

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 to the model. Using Data Mapper is required.
1.1 When to use it
If the business layer is frequently changed and is gradually complex, using Domain Model is a good choice. Creating Service Layer wraps the Domain Model to provide unified API for outer modules. ....

Service Layer , Domain Logic Pattern , Domain Model , Data Mapper , Revenue Recognition , Logic Pattern , Transaction Script , Strategy Pattern , Entity Framework , Table Module , சேவை அடுக்கு , களம் மாதிரி , வருவாய் அங்கீகாரம் , நிறுவனம் கட்டமைப்பு ,

[PoEAA] Domain Logic Pattern - Transaction Script - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天

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.
Usually, a database transaction maps to a transaction script. So it is easily to implement data isolation.
2. Pattern Practice: The Revenue Recognition Problem ....

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Avoiding NullPointerException - DZone Java

Avoiding NullPointerException
In this article, we ll 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, we ll 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. There are a number of ways to implement this constraint: validating the user data on the create and update use-cases, enforcing it via
NOT NULL database constraint and/or implementing the null-check right in the constructor of the Customer entity. In this article, we ll explore the last one. ....

Member Card , Clean Architecture , Data Transfer Objects , Domain Model , உறுப்பினர் அட்டை , சுத்தமான கட்டிடக்கலை , தகவல்கள் பரிமாற்றம் பொருள்கள் , களம் மாதிரி ,