The Intersection of Microservices, Domain-Driven Design and Entity Framework Core

Domain-Driven Design (DDD) provides much of the strategic design guidance that we can use to determine the boundaries around and interactions between Microservices in our solutions. DDD also follows up with tactical design patterns for your business logic. In this session we’ll take a look at some of these patterns and how EF Core naturally, or with some additional configuration, persists the data that your microservices depend on.

#domain-driven #microservices #intersection

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The Concept of Domain-Driven Design Explained

Using microservices means creating applications from loosely coupling services. The application consists of several small services, each representing a separate business goal. They can be developed and easily maintained individually, after what they are joint in a complex application.

Microservices is an architecture design model with a specific bounded context, configuration, and dependencies. These result from the architectural principles of the domain-driven design and DevOps. Domain-driven design is the idea of solving problems of the organization through code.

The business goal is important to the business users, with a clear interface and functions. This way, the microservice can run independently from other microservices. Moreover, the team can also work on it independently, which is, in fact, the point of the microservice architecture.

Many developers claim microservices have made them more efficient. This is due to the ability to work in small teams. This allows them to develop different small parts that will later be merged as a large app.

They spend less time coordinating with other developers and more time on developing the actual code. Eventually, this creates more value for the end-user.

The Complexity Challenge

Complexity is a relative term. What’s complex for one person is simple for another. However, complexity is the problem that domain-driven design should solve. In this context, complexity means interconnectedness, many different data sources, different business goals, etc.

The domain-driven approach is here to solve the complexity of software development. On the other hand, you can use emergent design when the challenge is simple. However, when your application is complex, the complexity will only grow, and so will your problems.

Domain-driven design bases on the business domain. Modern business environments are very complex and wrong moves can lead to fatal outcomes. Domain-driven design solves complex domain models, connecting to the core business concepts.

Eric Evans, introduced the concept in 2004, in his book Domain-Driven Design: Tackling Complexity in the Heart of Software. According to the book, it focuses on three principles:

• The primary focus of the project is the core domain and domain logic.
• Complex designs are based on models of the domain.
• Collaboration between technical and domain experts is crucial to creating an application model that will solve particular domain problems.

Important Terms in Domain-Driven Design

In DDD, it’s important to pay attention to the following terms:

Domain logic

Domain logic is the purpose of your modeling. Most commonly, it’s referred to as the business logic. This is where your business rules define the way data gets created, stored, and modified.

Domain model

Domain model includes the ideas, knowledge, data, metrics, and goals that revolve around that problem you’re trying to solve. It contains all the rules and patterns that will help you deal with complex business logic. Moreover, they will be useful to meet the requirements of your business.

Subdomain

A domain consists of several subdomains that refer to different parts of the business logic. For example, an online retail store could have a product catalog, inventory, and delivery as its subdomains.

Design patterns

Design patternsare all about reusing code. No matter the complexity of the problem you encounter, someone who’s been doing object-oriented programming has probably already created a pattern that will help you solve it. Breaking down your problem into its initial elements will lead you to its solution. Everything you learn through patterns, you can later use for any object-oriented language you start to program in.

#devops #microservices #domain driven design #microservices adoption #microservices archiecture #domain driven design introduction

The Intersection of Microservices, Domain-Driven Design and Entity Framework Core

Domain-Driven Design (DDD) provides much of the strategic design guidance that we can use to determine the boundaries around and interactions between Microservices in our solutions. DDD also follows up with tactical design patterns for your business logic. In this session we’ll take a look at some of these patterns and how EF Core naturally, or with some additional configuration, persists the data that your microservices depend on.

#domain-driven #microservices #intersection

jQuery Ajax CRUD in ASP.NET Core MVC with Modal Popup

In this article, we’ll discuss how to use jQuery Ajax for ASP.NET Core MVC CRUD Operations using Bootstrap Modal. With jQuery Ajax, we can make HTTP request to controller action methods without reloading the entire page, like a single page application.

To demonstrate CRUD operations – insert, update, delete and retrieve, the project will be dealing with details of a normal bank transaction. GitHub repository for this demo project : https://bit.ly/33KTJAu.

Sub-topics discussed :

• Form design for insert and update operation.
• Display forms in modal popup dialog.
• Form post using jQuery Ajax.
• Implement MVC CRUD operations with jQuery Ajax.
• Loading spinner in .NET Core MVC.
• Prevent direct access to MVC action method.

Create ASP.NET Core MVC Project

In Visual Studio 2019, Go to File > New > Project (Ctrl + Shift + N).

From new project window, Select Asp.Net Core Web Application_._

Once you provide the project name and location. Select Web Application(Model-View-Controller) and uncheck HTTPS Configuration. Above steps will create a brand new ASP.NET Core MVC project.

Setup a Database

Let’s create a database for this application using Entity Framework Core. For that we’ve to install corresponding NuGet Packages. Right click on project from solution explorer, select Manage NuGet Packages_,_ From browse tab, install following 3 packages.

Now let’s define DB model class file – /Models/TransactionModel.cs.

public class TransactionModel
{
    [Key]
    public int TransactionId { get; set; }

    [Column(TypeName ="nvarchar(12)")]
    [DisplayName("Account Number")]
    [Required(ErrorMessage ="This Field is required.")]
    [MaxLength(12,ErrorMessage ="Maximum 12 characters only")]
    public string AccountNumber { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Beneficiary Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BeneficiaryName { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Bank Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BankName { get; set; }

    [Column(TypeName ="nvarchar(11)")]
    [DisplayName("SWIFT Code")]
    [Required(ErrorMessage = "This Field is required.")]
    [MaxLength(11)]
    public string SWIFTCode { get; set; }

    [DisplayName("Amount")]
    [Required(ErrorMessage = "This Field is required.")]
    public int Amount { get; set; }

    [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
    public DateTime Date { get; set; }
}

C#Copy

Here we’ve defined model properties for the transaction with proper validation. Now let’s define  DbContextclass for EF Core.

#asp.net core article #asp.net core #add loading spinner in asp.net core #asp.net core crud without reloading #asp.net core jquery ajax form #asp.net core modal dialog #asp.net core mvc crud using jquery ajax #asp.net core mvc with jquery and ajax #asp.net core popup window #bootstrap modal popup in asp.net core mvc. bootstrap modal popup in asp.net core #delete and viewall in asp.net core #jquery ajax - insert #jquery ajax form post #modal popup dialog in asp.net core #no direct access action method #update #validation in modal popup

Announcing Entity Framework Core (EF Core) 5 RC2

Today, the Entity Framework Core team announces the second release candidate (RC2) of EF Core 5.0. This is a feature complete release candidate of EF Core 5.0 and ships with a “go live” license. You are supported using it in production. This is a great opportunity to start using EF Core 5.0 early while there is still time to fix remaining issues. We’re looking for reports of any remaining critical bugs that should be fixed before the final release.

Prerequisites

EF Core 5.0 will not run on .NET Standard 2.0 platforms, including .NET Framework.

• The release candidates of EF Core 5.0 require .NET Standard 2.1.
• This means that EF Core 5.0 will run on .NET Core 3.1 and does not require .NET 5.
• To summarize: EF Core 5.0 runs on platforms that support .NET Standard 2.1.

How to get EF Core 5.0 Release Candidate 2

EF Core is distributed exclusively as a set of NuGet packages. For example, to add the SQL Server provider to your project, you can use the following command using the dotnet tool:

dotnet add package Microsoft.EntityFrameworkCore.SqlServer --version 5.0.0-rc.2.20475.6

#.net #.net core #.net framework #asp.net #c# #entity framework #announcement #asp.net core #entity framework core

Entity Framework Core in ASP.NET Core 3.1

This article will be covering in detail the implementation of Entity Framework Core in ASP.NET Core Web API. We will learn about entity framework core in details i.e. what, how & why and see how to use it in ASP.NET Core Web API to implement CRUD operations. Though here we will be using entity framework in ASP.NET Core this can be implemented even in .NET Framework for your data persistence. I hope you will join me on this and go through step by step demonstration on implementing entity framework core in ASP.NET Core Web API.

Introduction to Entity Framework Core

Entity Framework has been around since 2008 which has improved over the years. Entity framework core was introduced for .NET Core based applications. It is an open-source object-relational mapper (ORM) built over ADO.NET and an official data access platform from Microsoft. Entity framework core has been rewritten from scratch to make it lightweight, flexible & achieve better performance.

In the absence of an ORM typically lots of code have to be written to perform CRUD operations with the database. using an ORM like entity framework can reduce the number of lines of code to be written for database interactions. Typical ORM will work on classes & database tables of similar structure but entity framework core implements mappings which makes it a lot more flexible i.e. in case table & class does not match then mappings can be exercised to get from objects to tables.

Entity framework core can work with wide variety of databases. Microsoft provides rich providers for SQL Server & SQLite and there are many other third party providers some commercial and some from community.

How does entity framework core works?

1. Define domain classes & configure entity framework DbContext API along with mappings to let entity framework work how this class maps to the database schema.
2. Write LINQ to objects to fetch data from the database.
3. Based on mappings & database provider configured entity framework will translate queries into SQL that’s understood by the database.
4. The query is executed and the object is populated with data.
5. Data in objects can be modified, deleted or new records can be added to the list & once done call DbContext.saveChanges from EF API to save data back to the database.
6. The entity framework will generate the required SQL statements to save data back to the database.

#programming #.net core #asp.net core 3.1 #entity framework #entity framework core