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MPCoreDeveloper
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new version with EF provider fixs for GUID paths
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‎Examples/SharpCoreDB.EFCoreCrudDemo/Program.cs‎

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using Microsoft.EntityFrameworkCore;
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using SharpCoreDB.EntityFrameworkCore;
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using System.Text.Json;
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Console.WriteLine("?? SharpCoreDB + EF Core - Full CRUD Demo (Companies & Vacancies)");
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Console.WriteLine("Using recommended reliable patterns for Guid relationships\n");
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// Setup database (in-memory file for demo)
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var dbPath = $"./crud_demo_{Guid.NewGuid():N}.scdb";
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var connectionString = $"Data Source={dbPath};Password=DemoPassword123;Cache=Shared";
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var options = new DbContextOptionsBuilder<CompanyVacancyContext>()
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.UseSharpCoreDB(connectionString)
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.Options;
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using var context = new CompanyVacancyContext(options);
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await context.Database.EnsureCreatedAsync();
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// =====================================================================
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// 1. LOAD SEED DATA
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// =====================================================================
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Console.WriteLine("?? Loading seed data from companies.vacancies.seed.json...");
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var json = await File.ReadAllTextAsync("companies.vacancies.seed.json");
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var seedData = JsonSerializer.Deserialize<SeedDataRoot>(json, new JsonSerializerOptions
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{
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PropertyNameCaseInsensitive = true
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})!;
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Console.WriteLine($" Loaded {seedData.Companies.Count} companies from seed file.\n");
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// =====================================================================
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// 2. CREATE (Seed the database)
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// =====================================================================
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Console.WriteLine("?? CREATE - Seeding companies and vacancies...");
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foreach (var seed in seedData.Companies)
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{
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var company = new Company
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{
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Id = Guid.NewGuid(),
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Name = seed.Name,
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Address = seed.Address
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};
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foreach (var v in seed.Vacancies)
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{
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company.Vacancies.Add(new Vacancy
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{
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Id = Guid.NewGuid(),
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Title = v.Title,
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Description = v.Description,
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IsActive = v.IsActive,
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CompanyId = company.Id
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});
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}
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context.Companies.Add(company);
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}
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await context.SaveChangesAsync();
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Console.WriteLine(" Seeded successfully.\n");
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// =====================================================================
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// 3. READ - Using recommended reliable pattern
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// =====================================================================
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Console.WriteLine("?? READ - Getting companies with active vacancies (recommended pattern)...");
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var activeCompanies = await GetActiveWithVacanciesAsync(context);
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Console.WriteLine($" Found {activeCompanies.Count} companies with at least one active vacancy:");
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foreach (var c in activeCompanies)
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{
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Console.WriteLine($" - {c.Name} ({c.Vacancies.Count(v => v.IsActive)} active vacancies)");
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}
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Console.WriteLine();
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// =====================================================================
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// 4. UPDATE
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// =====================================================================
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Console.WriteLine("?? UPDATE - Changing a vacancy...");
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var delta = await context.Companies
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.AsNoTracking()
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.FirstAsync(c => c.Name == "Delta Logistics");
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var backendDev = await context.Vacancies.FirstAsync(v => v.Title == "Backend Developer" && v.CompanyId == delta.Id);
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backendDev.Title = "Senior Backend Developer";
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backendDev.IsActive = false;
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await context.SaveChangesAsync();
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Console.WriteLine(" Updated 'Backend Developer' → 'Senior Backend Developer' (IsActive = false)\n");
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// Re-read using recommended pattern
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var afterUpdate = await GetActiveWithVacanciesAsync(context);
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var deltaAfter = afterUpdate.First(c => c.Name == "Delta Logistics");
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Console.WriteLine($" Delta Logistics now has {deltaAfter.Vacancies.Count(v => v.IsActive)} active vacancies.\n");
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// =====================================================================
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// 5. CREATE NEW
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// =====================================================================
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Console.WriteLine("?? CREATE - Adding new company + vacancy...");
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var newCompany = new Company
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{
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Id = Guid.NewGuid(),
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Name = "Future Systems",
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Address = "Innovation Park 42, Amsterdam"
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};
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newCompany.Vacancies.Add(new Vacancy
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{
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Id = Guid.NewGuid(),
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Title = "AI Engineer",
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IsActive = true,
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CompanyId = newCompany.Id
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});
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context.Companies.Add(newCompany);
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await context.SaveChangesAsync();
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Console.WriteLine(" Added 'Future Systems' with AI Engineer vacancy.\n");
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// =====================================================================
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// 6. DELETE
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// =====================================================================
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Console.WriteLine("?? DELETE - Removing a vacancy...");
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var toDelete = await context.Vacancies
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.FirstAsync(v => v.Title == "Project Coordinator");
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context.Vacancies.Remove(toDelete);
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await context.SaveChangesAsync();
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Console.WriteLine(" Removed 'Project Coordinator' vacancy.\n");
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// Final read
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var final = await GetActiveWithVacanciesAsync(context);
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Console.WriteLine($" Final result: {final.Count} companies with active vacancies.");
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// Cleanup
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try { File.Delete(dbPath); } catch { }
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Console.WriteLine("\n? Full CRUD demo completed successfully!");
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Console.WriteLine(" (Using recommended reliable patterns for Guid-based relationships)");
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// =====================================================================
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// Recommended reliable helper (same pattern as CompanyVacancyRepository)
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// =====================================================================
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static async Task<List<Company>> GetActiveWithVacanciesAsync(CompanyVacancyContext dbContext)
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{
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var companies = await dbContext.Companies.AsNoTracking().OrderBy(x => x.Name).ToListAsync();
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var vacancies = await dbContext.Vacancies.AsNoTracking().ToListAsync();
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var byCompany = vacancies.GroupBy(v => v.CompanyId).ToDictionary(g => g.Key, g => g.ToList());
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foreach (var c in companies)
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{
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c.Vacancies = byCompany.TryGetValue(c.Id, out var list) ? list : [];
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}
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return companies.Where(x => x.Vacancies.Any(v => v.IsActive)).ToList();
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}
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// =====================================================================
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// Entity models (minimal for demo)
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// =====================================================================
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public class Company
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{
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public Guid Id { get; set; }
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public string Name { get; set; } = string.Empty;
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public string Address { get; set; } = string.Empty;
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public ICollection<Vacancy> Vacancies { get; set; } = [];
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}
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public class Vacancy
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{
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public Guid Id { get; set; }
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public string Title { get; set; } = string.Empty;
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public string Description { get; set; } = string.Empty;
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public bool IsActive { get; set; }
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public Guid CompanyId { get; set; }
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}
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public class CompanyVacancyContext(DbContextOptions<CompanyVacancyContext> options) : DbContext(options)
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{
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public DbSet<Company> Companies => Set<Company>();
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public DbSet<Vacancy> Vacancies => Set<Vacancy>();
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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modelBuilder.Entity<Company>(e =>
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{
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e.ToTable("Companies");
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e.HasKey(x => x.Id);
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e.Property(x => x.Name).IsRequired().HasMaxLength(200);
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e.HasMany(x => x.Vacancies).WithOne().HasForeignKey(v => v.CompanyId);
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});
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modelBuilder.Entity<Vacancy>(e =>
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{
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e.ToTable("Vacancies");
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e.HasKey(x => x.Id);
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e.Property(x => x.Title).IsRequired().HasMaxLength(200);
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});
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}
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}
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// Seed DTOs
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public class SeedDataRoot { public List<SeedCompany> Companies { get; set; } = []; }
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public class SeedCompany { public string Name { get; set; } = ""; public string Address { get; set; } = ""; public List<SeedVacancy> Vacancies { get; set; } = []; }
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public class SeedVacancy { public string Title { get; set; } = ""; public string Description { get; set; } = ""; public bool IsActive { get; set; } }

‎Examples/SharpCoreDB.EFCoreCrudDemo/README.md‎

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# SharpCoreDB EF Core Full CRUD Demo
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This is a **runnable console application** that demonstrates a complete end-to-end CRUD workflow using:
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- SharpCoreDB.EntityFrameworkCore provider
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- Guid primary keys and foreign keys
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- The **recommended reliable patterns** for reading relationships (instead of relying on `Include` + server-side navigation filters, which have current limitations)
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## What it does
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1. Loads the real dataset from `companies.vacancies.seed.json` (Delta Logistics, Nordic Retail, TechNova + their vacancies)
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2. **Create** – Seeds the entire dataset
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3. **Read** – Retrieves companies with active vacancies using the recommended two-query pattern
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4. **Update** – Modifies a vacancy (title + status)
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5. **Create (extra)** – Adds a brand new company with a vacancy
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6. **Delete** – Removes a specific vacancy
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7. Final verification using the reliable read pattern
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## How to run
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```bash
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cd Examples/SharpCoreDB.EFCoreCrudDemo
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dotnet run
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```
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## Key Takeaway
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This demo shows the **current best practice** for working with Guid-based relationships in SharpCoreDB.EntityFrameworkCore:
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- Use simple queries + manual navigation wiring for reads (see `GetActiveWithVacanciesAsync`)
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- This pattern is stable and recommended until deeper provider improvements (custom `IModificationCommandBatch`) are completed in a future release.
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## Roadmap
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A more "magical" EF experience (full `Include` + complex navigation queries for Guids on writes) is planned via Option B (custom batch implementation) in a later version.

‎Examples/SharpCoreDB.EFCoreCrudDemo/SharpCoreDB.EFCoreCrudDemo.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<RootNamespace>SharpCoreDB.EFCoreCrudDemo</RootNamespace>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\..\src\SharpCoreDB.EntityFrameworkCore\SharpCoreDB.EntityFrameworkCore.csproj" />
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</ItemGroup>
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<!-- System.Text.Json is included in .NET 10, no explicit reference needed -->
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<ItemGroup>
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<None Update="companies.vacancies.seed.json">
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<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>

‎Examples/SharpCoreDB.EFCoreCrudDemo/companies.vacancies.seed.json‎

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{
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"companies": [
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{
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"name": "Delta Logistics",
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"address": "Stationsplein 1, Rotterdam",
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"vacancies": [
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{
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"title": "Backend Developer",
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"description": "Build and maintain robust REST APIs.",
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"isActive": true
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},
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{
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"title": "Project Coordinator",
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"description": "Coordinate delivery timelines and communication.",
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"isActive": false
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},
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{
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"title": "DevOps Engineer",
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"description": "Implement CI/CD pipelines and manage cloud infrastructure.",
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"isActive": true
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},
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{
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"title": "Frontend Developer",
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"description": "Create responsive and user-friendly web interfaces.",
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"isActive": true
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}
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]
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},
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{
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"name": "Nordic Retail",
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"address": "Ringlaan 24, Gent",
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"vacancies": [
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{
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"title": "Data Analyst",
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"description": "Analyze sales and customer behavior data.",
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"isActive": true
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},
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{
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"title": "Marketing Specialist",
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"description": "Develop and execute marketing campaigns.",
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"isActive": true
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},
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{
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"title": "Store Manager",
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"description": "Oversee daily operations of the retail store.",
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"isActive": true
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}
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]
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},
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{
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"name": "TechNova",
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"address": "Innovatieweg 10, Eindhoven",
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"vacancies": [
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{
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"title": "AI Researcher",
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"description": "Conduct research on cutting-edge AI technologies.",
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"isActive": true
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},
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{
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"title": "Software Tester",
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"description": "Ensure software quality through rigorous testing.",
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"isActive": true
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},
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{
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"title": "Product Manager",
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"description": "Define product vision and roadmap.",
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"isActive": true
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}
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]
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}
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]
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}

‎Examples/SharpCoreDB.EFCoreCrudDemo/crud_demo_8d0632007b2a4c4e8c391cd0f766913e.scdb‎

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