public ExerciseManager(SoftUniContext db)
{
this.db = db;
}
public static void Main()
{
// Scaffold-DbContext "Server=(localdb)\MyInstance;Database=SoftUni;Integrated Security=true;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Data
// 1. Change connection string.
// 2. Write command in the Package Manager Console.
// 3. Classes will be plural (rename on hand).
// 4. Relations and constraints will be descriped with fluent api.
// 5. If you want data annotations add -DataAnnotations in the end of the command.
// Use logger for reading sql queries on console.
LoggerFactory SqlCommandLoggerFactory
= new LoggerFactory(new[] { new ConsoleLoggerProvider((category, level) => category == DbLoggerCategory.Database.Command.Name && level == LogLevel.Information, true) });
DbContextOptionsBuilder <SoftUniContext> optionsBuilder = new DbContextOptionsBuilder <SoftUniContext>();
optionsBuilder
.UseSqlServer(@"Server=(localdb)\MyInstance;Database=SoftUni;Integrated Security=true;")
.UseLoggerFactory(SqlCommandLoggerFactory);
// Test only single commands.
// Change entity.
using (var context = new SoftUniContext(optionsBuilder.Options))
{
var employee = context.Employees
.Include(e => e.Department)
.FirstOrDefault();
employee.FirstName = "Pesho";
employee.LastName = "Ivanov";
context.SaveChanges();
Console.WriteLine(Environment.NewLine);
Console.WriteLine($"{employee.FirstName} {employee.LastName} from {employee.Department.Name} department.");
}
// Insert single entity.
using (var context = new SoftUniContext(optionsBuilder.Options))
{
var project = new Project
{
Name = "EFCore",
Description = "EF Core Demo",
StartDate = DateTime.Now
};
context.Projects.Add(project);
context.SaveChanges();
Console.WriteLine(Environment.NewLine);
Console.WriteLine($"{project.Name} project added to the database.");
}
// Insert with relation.
using (var context = new SoftUniContext(optionsBuilder.Options))
{
var address = new Address
{
AddressText = "Balkan 4",
Town = new Town
{
Name = "Dinevo"
}
};
context.Addresses.Add(address);
context.SaveChanges();
Console.WriteLine(Environment.NewLine);
Console.WriteLine($"New address {address.AddressText} added in new city of {address.Town.Name}");
}
// Remove entity with reference.
using (var context = new SoftUniContext(optionsBuilder.Options))
{
var town = context.Towns
.Include(t => t.Addresses)
.FirstOrDefault(t => t.Name == "Dinevo");
context.RemoveRange(town.Addresses);
context.Towns.Remove(town);
context.SaveChanges();
Console.WriteLine(Environment.NewLine);
Console.WriteLine($"{town.Name} city remove from database.");
}
}
