dao5

public class UserDao
{
    public User findById(int id)
    {
        using var dataSource = NpgsqlDataSource.Create(
            "Server=mydemoserver.postgres.database.azure.com;" +
            "Username=mylogin@mydemoserver;" +
            "Database=mypgsqldb;" +
            "Port=5432;" +
            "Password=<server_admin_password>");
        var command = dataSource.CreateCommand("SELECT * FROM USER_TABLE WHERE ID = {id}");
        // execute command etc.
    }
}