c# - 基于身份声明的动态数据库连接字符串

Question

我正在向我的 Web 应用程序添加一些“租赁”。
我的 Web 应用程序使用 2 个数据库

• 身份数据库
• 一个特定于租户的数据库(所有相同的架构)

该应用程序是使用 一个静态 连接字符串构建的，用于第二个 数据库。

我使用静态连接字符串运行良好的 AppointmentsControllers:

public class AppointmentsController : Controller
{
    private appDbContext _context;

    public AppointmentsController()
    {
        _context = new appDbContext();
    }

    protected override void Dispose(bool disposing)
    {
        _context.Dispose();
    }

    // Index
    public ViewResult Index()
    {
        var query = from c in _context.Appointments
                    orderby c.RegistrationDate
                    select c;
        //etc...
    }
}

为了添加一些 Multi-Tenancy ，我更改了 DbContext 部分，以便我可以修改数据库连接。 这部分工作正常，它允许我更改数据库名称:

public class appDbContext : DbContext
{
    public DbSet<Appointments> Appointments { get; set; }

    public appDbContext(string database)
        : base(@"Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=" + database + ";Integrated Security=True")
    {
    }
}

从这里我迷路了。似乎可能从我的 AppointmentsController 构造函数连接正确的数据库，如下所示:

public class AppointmentsController : Controller
{
    private appDbContext _context;

    public AppointmentsController()
    {
        _context = new appDbContext("DbName");
    }

但是我不能从身份中检索我的 Claim 并将它从这个构造函数传递给构造函数，如下所示:

public class AppointmentsController : Controller
{
    private appDbContext _context;

    public AppointmentsController()
    {
        var manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
        var currentUser = manager.FindById(User.Identity.GetUserId());
        _context = new appDbContext(currentUser.DBName);
    }           

所以我完成工作的最佳方法是这样，但我认为它不是很干净/流畅:

public class AppointmentsController : Controller
{
    private appDbContext _context;

    public AppointmentsController()
    {
        _context = new appDbContext("");
    }

    protected override void Dispose(bool disposing)
    {
        _context.Dispose();
    }

    private string GetCurrentUserDatabaseName()
    {
        var manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new ApplicationDbContext()));
        var currentUser = manager.FindById(User.Identity.GetUserId());

        return currentUser.DBName;
    }

    // Index
    public ViewResult Index()
    {
        _context = new appDbContext(GetCurrentUserDatabaseName());

        var query = from c in _context.Appointments
                    orderby c.RegistrationDate
                    select c;
     //etc
    }
}

我觉得我很接近，但我该如何改进这段代码？

Answer 1

在 Web.Config 中添加两个连接字符串:

  <connectionStrings>
    <add name="DefaultConnection" connectionString=Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=DefaultDataBase;Integrated Security=True" providerName="System.Data.SqlClient" />     
  </connectionStrings>

然后

    public class ApplicationDbContext : DbContext //change DbContext name appDbContext by ApplicationDbContext
        {
            public DbSet<Appointments> Appointments { get; set; }

            public ApplicationDbContext(database=""): base("name=DefaultConnection")
            {
          //And/Or you can do this programmatically.
          if(!string.IsNullOrWhiteSpace(database)
             {
               this.Database.Connection.ConnectionString = @"Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=" + database + ";Integrated Security=True";
 //OR Database.Connection.ChangeDatabase(database);
             }
            // More Stuff.....
            }
        }

使用:

public class AppointmentsController : Controller
{
    private ApplicationDbContext _context;

    public AppointmentsController()
    {
        _context = new ApplicationDbContext("DataBasConnection");
    }
}

或

当你需要 DefultDatabase 时

public class AppointmentsController : Controller
{
    private ApplicationDbContext _context;

    public AppointmentsController()
    {
        _context = new ApplicationDbContext();
    }
}