.Net Core 中具有独立数据库的多租户系统

Question

我正在尝试为每个租户策略创建实施数据库。但我不明白我实际上将如何做 that.I 遵循此 link https://www.codeproject.com/Articles/848111/Multi-Tenancy-System-With-Separate-Databases-in-MV 但我使用 asp.net 核心 MVC。我是绝对的 beginner.how 我为不同的用户创建了一个单独的数据库。请帮忙

Answer 1

不确定您的模型设计如何，但您想要的是如何在项目中创建和使用多个数据库。

您可以按照以下步骤操作：

创建第一个数据库

模型设计：

public class Account
{
    public int Id { get; set; }
    public string Name { get; set; }
}

创建 DbContext：

public class FirstContext : DbContext
{
     public FirstContext (DbContextOptions<FirstContext> options)
         : base(options)
     {
     }

     public DbSet<Account> Account { get; set; }
}

在appsettings.json中添加连接字符串:

"ConnectionStrings": {
    "FirstContext": "Server=(localdb)\mssqllocaldb;Database=FirstUser;Trusted_Connection=True;MultipleActiveResultSets=true"
}

配置Startup.cs:

 public class Startup
 {
     public Startup(IConfiguration configuration)
     {
         Configuration = configuration;
     }

     public IConfiguration Configuration { get; }

     public void ConfigureServices(IServiceCollection services)
     {
         services.Configure<CookiePolicyOptions>(options =>
         {
             // This lambda determines whether user consent for non-essential cookies is needed for a given request.
             options.CheckConsentNeeded = context => true;
             options.MinimumSameSitePolicy = SameSiteMode.None;
         });
         services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

          //add this...
         services.AddDbContext<FirstContext>(options =>
             options.UseSqlServer(Configuration.GetConnectionString("FirstContext")));
     }

     public void Configure(IApplicationBuilder app, IHostingEnvironment env)
     {

         app.UseHttpsRedirection();
         app.UseStaticFiles();
         app.UseCookiePolicy();

         app.UseMvc(routes =>
         {
             routes.MapRoute(
                 name: "default",
                 template: "{controller=Home}/{action=Index}/{id?}");
         });
     }
 }

5.Run 创建数据库的命令（这种方式在 EF Core 中称为代码优先）：

PM> add-migration init
PM> update-database

6.Then 您可以在 (localdb)\MSSQLLocalDB->Database 中找到数据库 SQL Server Object Explorer（在菜单选项卡中打开 View-> 选择 SQL Server Object Explorer):

创建第二个数据库

重复 1-4 步：

型号：

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
}

数据库上下文：

 public class SecondContext : DbContext
 {
     public SecondContext(DbContextOptions<FirstContext> options)
         : base(options)
     {
     }

     public DbSet<User> User { get; set; }
 }

appsettings.json:

"ConnectionStrings": {
 "FirstContext": "Server=(localdb)\mssqllocaldb;Database=FirstContext-ed05c500-1e05-4d2c-876d-02172e464153;Trusted_Connection=True;MultipleActiveResultSets=true",
 "SecondContext": "Server=(localdb)\mssqllocaldb;Database=SecondUser;Trusted_Connection=True;MultipleActiveResultSets=true"
 }

Startup.cs:

services.AddDbContext<FirstContext>(options =>
                     options.UseSqlServer(Configuration.GetConnectionString("FirstContext")));

 //add this...
services.AddDbContext<SecondContext>(options =>
                     options.UseSqlServer(Configuration.GetConnectionString("SecondContext")));

不同的是你包含多个dbcontext，所以你在运行命令创建数据库时需要指定dbcontext名称：

PM> add-migration init2 -context secondcontext
PM> update-database -context secondcontext

如何获取不同的用户数据：

public class AccountsController : Controller
{
     private readonly FirstContext _context;
     private readonly SecondContext _context2;
     public AccountsController(FirstContext context, SecondContext context2)
     {
         _context = context;
         _context2 = context2;
     }

     public async Task<IActionResult> Index()
     {
         var user1 = _context.Account.ToList();
         var user2 = _context2.User.ToList();
         return View();
     }
}

.Net Core 中具有独立数据库的多租户系统

Multi-Tenancy System With Separate Databases in .Net Core

asp.net-mvc

asp.net-core-mvc

asp.net-core

asp.net-core-2.2