This repository presents a code example demonstrating a "one-to-one" relationship in Entity Framework.
A "one-to-one" relationship in Entity Framework is a connection between two entities, where each entity from one data set (table) is associated with one and only one entity from another data set (table).
A class representing a user. Linked to the UserProfile entity through the UserProfile property.
namespace _005_EF
{
internal class User
{
public int Id { get; set; }
public string? Name { get; set; }
public string? Password { get; set; }
public UserProfile UserProfile { get; set; }
}
}A class representing a user profile. It is linked to the User entity through the User property.
namespace _005_EF
{
internal class UserProfile
{
public int Id { get; set; }
public string? Name { get; set; }
public int Age { get; set; }
public int UserId { get; set; }
public User User { get; set; }
}
}The Context class represents the Entity Framework database context. It includes data sets for the User and UserProfile entities and is configured to work with SQL Server.
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
namespace _005_EF
{
internal class Context : DbContext
{
public DbSet<User> Users { get; set; }
public DbSet<UserProfile> Profiles { get; set; }
public Context()
{
Database.EnsureCreated();
}
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
var builder = new SqlConnectionStringBuilder
{
DataSource = ".",
InitialCatalog = "OneToOneTest",
IntegratedSecurity = true,
TrustServerCertificate = true,
};
optionsBuilder.UseSqlServer(builder.ConnectionString);
}
}
}The provided code illustrates the establishment of a "one-to-one" relationship between the User and UserProfile entities. In this relationship, each user is associated with only one profile, defining its characteristics. This design allows for effective data storage related to users by utilizing a separate profile table, ultimately minimizing data redundancy.
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