Bronze Layer Explained

The Bronze Layer is a critical component of Medallion Architecture. It is responsible for managing the physical data storage and retrieval from the database. In this article, we will take a closer look at the Bronze Layer, its importance in the overall Medallion Architecture, and how to implement it using Microsoft SQL Server code.

What is the Bronze Layer?

The Bronze Layer is the layer responsible for managing the data storage and retrieval from the database. It is responsible for creating, updating, and deleting records from the database, as well as retrieving records from the database. The Bronze Layer is also responsible for managing the data access layer of the application.

The Bronze Layer is the layer closest to the database and is responsible for implementing the database access layer. The Bronze Layer provides a high-level interface for data access, allowing the application to interact with the database without needing to know the details of how the data is stored in the database.

Why is the Bronze Layer important?

The Bronze Layer is important because it provides a layer of abstraction between the application and the database. The Bronze Layer shields the application from the complexity of the database by providing a simplified interface for data access. This simplification makes the application more maintainable and easier to modify in the future.

Another reason why the Bronze Layer is important is that it provides a layer of security between the application and the database. The Bronze Layer can be configured to enforce security policies, such as user authentication and authorization, to ensure that only authorized users can access the data in the database.

How to implement the Bronze Layer using MSSQL Server code?

The following steps outline how to implement the Bronze Layer using MSSQL Server code:

Step 1: Define the database schema

The first step in implementing the Bronze Layer is to define the database schema. The database schema defines the structure of the database, including tables, columns, and relationships between tables.

For example, let's say we want to create a database to store customer information. We would create a table called "Customers" with columns for "CustomerID", "FirstName", "LastName", "Email", and "PhoneNumber"

CREATE TABLE Customers (

CustomerID int IDENTITY(1,1) NOT NULL PRIMARY KEY,

FirstName varchar(50) NOT NULL,

LastName varchar(50) NOT NULL,

Email varchar(100) NOT NULL,

PhoneNumber varchar(20) NOT NULL

);

Step 2: Define the data access layer

The next step is to define the data access layer. The data access layer is responsible for interacting with the database and providing a high-level interface for data access.

For example, we could create a stored procedure to retrieve a customer record by customer ID:

CREATE PROCEDURE GetCustomerByID

@CustomerID int

AS

BEGIN

SELECT * FROM Customers WHERE CustomerID = @CustomerID

END

Step 3: Define the Bronze Layer

The next step is to define the Bronze Layer. The Bronze Layer is responsible for calling the data access layer and providing a simplified interface for data access.

if we use C# For example, we could create a class called "CustomerRepository" to implement the Bronze Layer:

public class CustomerRepository

{

private readonly string connectionString;

public CustomerRepository(string connectionString)

{

    this.connectionString = connectionString;

}

public Customer GetCustomerByID(int customerID)

{

    using (var connection = new SqlConnection(connectionString))

    {

        connection.Open();

        using (var command = new SqlCommand("GetCustomerByID", connection))

        {

            command.CommandType = CommandType.StoredProcedure;

            command.Parameters.AddWithValue("@CustomerID", customerID);

            using (var reader = command.ExecuteReader())

            {

                if (reader.Read())

                {

                    return new Customer

                    {

                        CustomerID = (int)reader["CustomerID"],

                        FirstName = (string)reader