Migrate to Azure Managed Identity for Azure SQL (mi-azuresql-spring)

[Copilot]

This PR introduces a new Spring Boot project mi-azuresql-spring that demonstrates how to connect to Azure SQL Database using Azure Managed Identity authentication, eliminating the need for password-based authentication.

Key Changes

1. Spring Boot Project Structure

Created a complete Spring Boot application with:

• Main Application: AzureSqlManagedIdentityApplication.java - Entry point for the Spring Boot application
• Database Service: DatabaseService.java - Service layer for Azure SQL connectivity with managed identity
• REST Controller: DatabaseController.java - Exposes endpoints for testing database connectivity
• Comprehensive Tests: Unit tests with H2 in-memory database for CI/CD validation

2. Maven Configuration (pom.xml)

Added Spring Cloud Azure BOM and dependencies:

<!-- Spring Cloud Azure BOM -->
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.azure.spring</groupId>
            <artifactId>spring-cloud-azure-dependencies</artifactId>
            <version>5.22.0</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<!-- Azure Spring Cloud starter for managed identity -->
<dependency>
    <groupId>com.azure.spring</groupId>
    <artifactId>spring-cloud-azure-starter</artifactId>
</dependency>

3. Managed Identity Configuration (application.properties)

Configured Azure SQL connection with managed identity authentication:

# Azure SQL with Managed Identity authentication
spring.datasource.url=jdbc:sqlserver://${AZ_DATABASE_SERVER_NAME}.database.windows.net:1433;database=demo;encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30;authentication=ActiveDirectoryMSI

# Enable managed identity for Spring Cloud Azure
spring.cloud.azure.credential.managed-identity-enabled=true
spring.cloud.azure.credential.client-id=${AZURE_CLIENT_ID}

4. REST API Endpoints

The application provides the following endpoints for testing:

• GET /api/database/health - Application health check
• GET /api/database/test-connection - Test Azure SQL connectivity
• GET /api/database/version - Get database version
• GET /api/database/test-query - Execute a simple test query

5. Documentation

Comprehensive README.md with:

• Setup instructions for Azure resources
• Environment variable configuration
• API endpoint documentation
• Deployment guidance for Azure services

Benefits

✅ Security: Eliminates password-based authentication
✅ Azure Native: Uses Azure Managed Identity for seamless authentication
✅ Production Ready: Includes proper error handling, logging, and testing
✅ Easy Testing: REST endpoints for validating connectivity
✅ Documentation: Complete setup and usage instructions

This migration demonstrates best practices for connecting Spring Boot applications to Azure SQL Database using managed identity, providing a secure and maintainable solution for Azure-native applications.

Created from VS Code via the GitHub Pull Request extension.

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