Certainly, I can assist you in developing a robust logistical system. Given the complexity and scope of this project, we will approach it iteratively, starting with the foundational architecture, database design, and initial components for a key module like Sales Management. We set up the initial structure for the Sales Management module, including database schema, backend models, repository, controller, and basic frontend components. -- Create Customers Table CREATE TABLE Customers ( Id SERIAL PRIMARY KEY, FirstName VARCHAR(100) NOT NULL, LastName VARCHAR(100) NOT NULL, Email VARCHAR(255) UNIQUE NOT NULL, Phone VARCHAR(50), Address VARCHAR(255), City VARCHAR(100), StateProvince VARCHAR(100), PostalCode VARCHAR(20), Country VARCHAR(100), CreatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), UpdatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW() ); -- Create Orders Table CREATE TABLE Orders ( Id SERIAL PRIMARY KEY, CustomerId INT NOT NULL, OrderDate TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), Status VARCHAR(50) NOT NULL, -- e.g., 'Pending', 'Processing', 'Shipped', 'Delivered', 'Cancelled' TotalAmount DECIMAL(18, 2) NOT NULL, ShippingAddress VARCHAR(255), ShippingCity VARCHAR(100), ShippingStateProvince VARCHAR(100), ShippingPostalCode VARCHAR(20), ShippingCountry VARCHAR(100), Notes TEXT, CreatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), UpdatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), FOREIGN KEY (CustomerId) REFERENCES Customers(Id) ); -- Create OrderItems Table CREATE TABLE OrderItems ( Id SERIAL PRIMARY KEY, OrderId INT NOT NULL, Description VARCHAR(255) NOT NULL, Quantity INT NOT NULL, UnitPrice DECIMAL(18, 2) NOT NULL, LineTotal DECIMAL(18, 2) NOT NULL, CreatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), UpdatedAt TIMESTAMP WITHOUT TIME ZONE DEFAULT NOW(), FOREIGN KEY (OrderId) REFERENCES Orders(Id) ); -- Add indexes for performance CREATE INDEX idx_customers_email ON Customers(Email); CREATE INDEX idx_orders_customerid ON Orders(CustomerId); CREATE INDEX idx_orders_orderdate ON Orders(OrderDate); CREATE INDEX idx_orderitems_orderid ON OrderItems(OrderId); using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace Logistics.Api.Models { public class Customer { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } [Required] [MaxLength(100)] public string FirstName { get; set; } [Required] [MaxLength(100)] public string LastName { get; set; } [Required] [MaxLength(255)] public string Email { get; set; } [MaxLength(50)] public string Phone { get; set; } [MaxLength(255)] public string Address { get; set; } [MaxLength(100)] public string City { get; set; } [MaxLength(100)] public string StateProvince { get; set; } [MaxLength(20)] public string PostalCode { get; set; } [MaxLength(100)] public string Country { get; set; } public DateTime CreatedAt { get; set; } public DateTime UpdatedAt { get; set; } public ICollection Orders { get; set; } = new List(); } } using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace Logistics.Api.Models { public class Order { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } [Required] public int CustomerId { get; set; } [ForeignKey("CustomerId")] public Customer Customer { get; set; } public DateTime OrderDate { get; set; } [Required] [MaxLength(50)] public string Status { get; set; } // e.g., 'Pending', 'Processing', 'Shipped', 'Delivered', 'Cancelled' [Required] [Column(TypeName = "decimal(18, 2)")] public decimal TotalAmount { get; set; } [MaxLength(255)] public string ShippingAddress { get; set; } [MaxLength(100)] public string ShippingCity { get; set; } [MaxLength(100)] public string ShippingStateProvince { get; set; } [MaxLength(20)] public string ShippingPostalCode { get; set; } [MaxLength(100)] public string ShippingCountry { get; set; } public string Notes { get; set; } public DateTime CreatedAt { get; set; } public DateTime UpdatedAt { get; set; } public ICollection OrderItems { get; set; } = new List(); } } using System; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace Logistics.Api.Models { public class OrderItem { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } [Required] public int OrderId { get; set; } [ForeignKey("OrderId")] public Order Order { get; set; } [Required] [MaxLength(255)] public string Description { get; set; } [Required] public int Quantity { get; set; } [Required] [Column(TypeName = "decimal(18, 2)")] public decimal UnitPrice { get; set; } [Required] [Column(TypeName = "decimal(18, 2)")] public decimal LineTotal { get; set; } public DateTime CreatedAt { get; set; } public DateTime UpdatedAt { get; set; } } } using Logistics.Api.Models; using Microsoft.EntityFrameworkCore; namespace Logistics.Api.Data { public class AppDbContext : DbContext { public AppDbContext(DbContextOptions options) : base(options) { } public DbSet Customers { get; set; } public DbSet Orders { get; set; } public DbSet OrderItems { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); // Configure relationships if needed, EF Core conventions handle basic ones // modelBuilder.Entity() // .HasOne(o => o.Customer) // .WithMany(c => c.Orders) // .HasForeignKey(o => o.CustomerId); // modelBuilder.Entity() // .HasOne(oi => oi.Order) // .WithMany(o => o.OrderItems) // .HasForeignKey(oi => oi.OrderId); // Add indexes explicitly if not covered by conventions or for specific needs modelBuilder.Entity() .HasIndex(c => c.Email) .IsUnique(); // Assuming email must be unique modelBuilder.Entity() .HasIndex(o => o.CustomerId); modelBuilder.Entity() .HasIndex(o => o.OrderDate); modelBuilder.Entity() .HasIndex(oi => oi.OrderId); } public override int SaveChanges() { AddTimestamps(); return base.SaveChanges(); } public override Task SaveChangesAsync(CancellationToken cancellationToken = default) { AddTimestamps(); return base.SaveChangesAsync(cancellationToken); } private void AddTimestamps() { var entities = ChangeTracker.Entries() .Where(x => x.Entity is not null && (x.State == EntityState.Added || x.State == EntityState.Modified)); foreach (var entityEntry in entities) { var now = DateTime.UtcNow; // Use UtcNow for consistency if (entityEntry.State == EntityState.Added) { if (entityEntry.Property("CreatedAt") != null) { entityEntry.Property("CreatedAt").CurrentValue = now; } if (entityEntry.Property("UpdatedAt") != null) { entityEntry.Property("UpdatedAt").CurrentValue = now; } } else if (entityEntry.State == EntityState.Modified) { if (entityEntry.Property("UpdatedAt") != null) { entityEntry.Property("UpdatedAt").CurrentValue = now; } } } } } } using Logistics.Api.Models; using System.Collections.Generic; using System.Threading.Tasks; namespace Logistics.Api.Interfaces { public interface ICustomerRepository { Task> GetAllCustomersAsync(); Task GetCustomerByIdAsync(int id); Task AddCustomerAsync(Customer customer); void UpdateCustomer(Customer customer); void DeleteCustomer(Customer customer); Task SaveChangesAsync(); } } using Logistics.Api.Interfaces; using Logistics.Api.Models; using Microsoft.EntityFrameworkCore; using System.Collections.Generic; using System.Threading.Tasks; namespace Logistics.Api.Data.Repositories { public class CustomerRepository : ICustomerRepository { private readonly AppDbContext _context; public CustomerRepository(AppDbContext context) { _context = context; } public async Task> GetAllCustomersAsync() { return await _context.Customers.OrderBy(c => c.LastName).ToListAsync(); } public async Task GetCustomerByIdAsync(int id) { return await _context.Customers.FirstOrDefaultAsync(c => c.Id == id); } public async Task AddCustomerAsync(Customer customer) { await _context.Customers.AddAsync(customer); } public void UpdateCustomer(Customer customer) { // EF Core tracks changes automatically for attached entities } public void DeleteCustomer(Customer customer) { _context.Customers.Remove(customer); } public async Task SaveChangesAsync() { return await _context.SaveChangesAsync() > 0; } } } using Logistics.Api.Interfaces; using Logistics.Api.Models; using Microsoft.AspNetCore.Mvc; using System.Collections.Generic; using System.Threading.Tasks; namespace Logistics.Api.Controllers { [ApiController] [Route("api/[controller]")] public class CustomersController : ControllerBase { private readonly ICustomerRepository _customerRepository; public CustomersController(ICustomerRepository customerRepository) { _customerRepository = customerRepository; } [HttpGet] public async Task>> GetCustomers() { var customers = await _customerRepository.GetAllCustomersAsync(); return Ok(customers); } [HttpGet("{id}")] public async Task> GetCustomer(int id) { var customer = await _customerRepository.GetCustomerByIdAsync(id); if (customer == null) { return NotFound(); } return Ok(customer); } [HttpPost] public async Task> CreateCustomer(Customer customer) { await _customerRepository.AddCustomerAsync(customer); await _customerRepository.SaveChangesAsync(); return CreatedAtAction(nameof(GetCustomer), new { id = customer.Id }, customer); } [HttpPut("{id}")] public async Task UpdateCustomer(int id, Customer customer) { if (id != customer.Id) { return BadRequest(); } var existingCustomer = await _customerRepository.GetCustomerByIdAsync(id); if (existingCustomer == null) { return NotFound(); } // Update properties manually or use AutoMapper existingCustomer.FirstName = customer.FirstName; existingCustomer.LastName = customer.LastName; existingCustomer.Email = customer.Email; existingCustomer.Phone = customer.Phone; existingCustomer.Address = customer.Address; existingCustomer.City = customer.City; existingCustomer.StateProvince = customer.StateProvince; existingCustomer.PostalCode = customer.PostalCode; existingCustomer.Country = customer.Country; // UpdatedAt is handled by DbContext SaveChanges override _customerRepository.UpdateCustomer(existingCustomer); // Mark as modified if needed, EF Core often tracks automatically await _customerRepository.SaveChangesAsync(); return NoContent(); } [HttpDelete("{id}")] public async Task DeleteCustomer(int id) { var customer = await _customerRepository.GetCustomerByIdAsync(id); if (customer == null) { return NotFound(); } _customerRepository.DeleteCustomer(customer); await _customerRepository.SaveChangesAsync(); return NoContent(); } } } using Logistics.Api.Data; using Logistics.Api.Interfaces; using Logistics.Api.Data.Repositories; using Microsoft.EntityFrameworkCore; var builder = WebApplication.CreateBuilder(args); // Add services to the container. builder.Services.AddControllers(); // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle builder.Services.AddEndpointsApiExplorer(); builder.Services.AddSwaggerGen(); // Configure PostgreSQL connection var connectionString = builder.Configuration.GetConnectionString("DefaultConnection"); builder.Services.AddDbContext(options => options.UseNpgsql(connectionString)); // Use UseMySql for MySQL // Add Repositories builder.Services.AddScoped(); // Add other repositories here var app = builder.Build(); // Configure the HTTP request pipeline. if (app.Environment.IsDevelopment()) { app.UseSwagger(); app.UseSwaggerUI(); } app.UseHttpsRedirection(); app.UseAuthorization(); app.MapControllers(); app.Run(); { "Logging": { "LogLevel": { "Default": "Information", "Microsoft.AspNetCore": "Warning" } }, "ConnectionStrings": { "DefaultConnection": "Host=localhost;Port=5432;Database=logisticsdb;Username=myuser;Password=mypassword" // Replace with your PostgreSQL connection string // For MySQL: "Server=localhost;Port=3306;Database=logisticsdb;Uid=myuser;Pwd=mypassword;" } } export interface Customer { id?: number; firstName: string; lastName: string; email: string; phone?: string; address?: string; city?: string; stateProvince?: string; postalCode?: string; country?: string; createdAt?: Date; updatedAt?: Date; } import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { Customer } from '../models/customer.model'; @Injectable({ providedIn: 'root' }) export class CustomerService { private apiUrl = 'api/customers'; // Adjust API URL as needed constructor(private http: HttpClient) { } getCustomers(): Observable { return this.http.get(this.apiUrl); } getCustomer(id: number): Observable { return this.http.get(`${this.apiUrl}/${id}`); } createCustomer(customer: Customer): Observable { return this.http.post(this.apiUrl, customer); } updateCustomer(id: number, customer: Customer): Observable { return this.http.put(`${this.apiUrl}/${id}`, customer); } deleteCustomer(id: number): Observable { return this.http.delete(`${this.apiUrl}/${id}`); } } import { Component, OnInit } from '@angular/core'; import { CustomerService } from '../services/customer.service'; import { Customer } from '../models/customer.model'; @Component({ selector: 'app-customer-list', templateUrl: './customer-list.component.html', styleUrls: ['./customer-list.component.css'] }) export class CustomerListComponent implements OnInit { customers: Customer[] = []; loading = true; error: any; constructor(private customerService: CustomerService) { } ngOnInit(): void { this.loadCustomers(); } loadCustomers(): void { this.loading = true; this.customerService.getCustomers().subscribe({ next: (data) => { this.customers = data; this.loading = false; }, error: (err) => { this.error = err; this.loading = false; console.error('Error fetching customers', err); } }); } // Add methods for add, edit, delete actions here // For example: // deleteCustomer(id: number): void { // this.customerService.deleteCustomer(id).subscribe({ // next: () => { // this.loadCustomers(); // Refresh the list // }, // error: (err) => { // console.error('Error deleting customer', err); // } // }); // } }

Customer List

Loading customers...

Error loading customers: {{ error.message }}

ID	First Name	Last Name	Email	Phone	Actions
{{ customer.id }}	{{ customer.firstName }}	{{ customer.lastName }}	{{ customer.email }}	{{ customer.phone }}

No customers found.

import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { HttpClientModule } from '@angular/common/http'; // Import HttpClientModule import { AppComponent } from './app.component'; import { CustomerListComponent } from './customer-list/customer-list.component'; // Import other components here @NgModule({ declarations: [ AppComponent, CustomerListComponent // Declare other components here ], imports: [ BrowserModule, HttpClientModule // Add HttpClientModule here // Import other modules here (e.g., AppRoutingModule) ], providers: [], bootstrap: [AppComponent] }) export class AppModule { } This provides the initial database schema and the foundational code structure for the Sales Management module's customer functionality using ASP.NET Core and Angular, following the Repository pattern and using Entity Framework Core. We can proceed by adding more features to the Sales Management module (like Order management, pricing logic) or move on to setting up other modules as per the timeline.