PI06 i PI06-1. Docker definitions for MSSQL and Postgres. Data seeder/generator for countries and people. Entity Framework example with variants for Postgres and MSSQL

DataAccess/EF_Demo/Demo.cs

@@ -0,0 +1,110 @@
+#if POSTGRES
+using EF_Demo.Data.Postgres;
+#else
+using EF_Demo.Data.MSSQL;
+#endif
+
+using EF_Demo.Models;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+namespace EF_Demo;
+
+internal class Demo
+{
+  internal static int? AddEvent(IServiceProvider serviceProvider, string eventName, DateOnly eventDate)
+  {
+    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
+    try
+    {
+      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      Event @event = new()
+      {
+        Name = eventName,
+        EventDate = eventDate
+      };
+      ctx.Add(@event);  //or ctx.Events.Add(@event) or ctx.Set<Event>().Add(@event);
+      ctx.SaveChanges();
+      logger.LogInformation($"Event {eventName} successfully added with id {@event.Id}");
+      return @event.Id;
+    }
+    catch (Exception exc)
+    {
+      logger.LogError($"Error adding event #{eventName}: {exc.CompleteExceptionMessage()}");
+      return null;
+    }
+  }
+
+  internal static void DeleteEvent(IServiceProvider serviceProvider, int eventId)
+  {
+    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
+    try
+    {
+      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      Event? @event = ctx.Events.Find(eventId);
+      if (@event != null)
+      {
+        ctx.Remove(@event); //or ctx.Entry(product).State = EntityState.Deleted;
+        ctx.SaveChanges();
+        logger.LogInformation($"Event {@event.Name} deleted");
+      }
+      else
+      {
+        logger.LogWarning($"Event #{eventId} does not exists");
+      }
+    }
+    catch (Exception exc)
+    {
+      logger.LogError($"Error deleting event #{eventId}: {exc.CompleteExceptionMessage()}");
+    }
+  }
+  
+  internal static void PostponeEvent(IServiceProvider serviceProvider, int eventId, int days)
+  {
+    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
+    try
+    {
+      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      Event? @event = ctx.Events.Find(eventId);
+      if (@event != null)
+      {
+        @event.EventDate = @event.EventDate.AddDays(days);
+        ctx.SaveChanges();
+        logger.LogInformation($"Event {@event.Name} postoponed to {@event.EventDate:dd.MM.yyyy.}");
+      }
+      else
+      {
+        logger?.LogWarning($"Event #{eventId} does not exists");
+      }
+    }
+    catch (Exception exc)
+    {
+      logger?.LogError($"Error trying to change evenbt #{eventId}: {exc.CompleteExceptionMessage()}");
+    }
+  }
+
+  /// <summary>
+  /// Print all people born in the provided year, ordered by country, and then by transliterated last name, and first name
+  /// query is projected to an anonymous class
+  /// </summary>
+  internal static void PrintPeople(IServiceProvider serviceProvider, int year)
+  {
+    using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+    var query = ctx.People
+                   .Where(p => p.BirthDate.Year == year)
+                   .OrderBy(p => p.CountryCodeNavigation.Name)                  
+                   .ThenBy(p => p.LastNameTranscription)
+                   .ThenBy(p => p.FirstNameTranscription)
+                   .Select(p => new
+                   {
+                     p.FirstName, p.LastName,
+                     p.FirstNameTranscription, p.LastNameTranscription,
+                     p.BirthDate,
+                     Country = p.CountryCodeNavigation.Name
+                   });
+    foreach (var p in query)
+    {
+      Console.WriteLine($"{p.FirstName} {p.LastName} ({p.FirstNameTranscription} {p.LastNameTranscription}), {p.Country} {p.BirthDate:dd.MM.yyyy.}");
+    }
+  }
+}