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  • 使用EF6简实现多租户的应用

    什么是多租户

    网上有好多解释，有些上升到了架构设计，让你觉得似乎非常高深莫测，特别是目前流行的ABP架构中就有提到多租户（IMustHaveTenant），其实说的简单一点就是再每一张数据库的表中添加一个TenantId的字段，用于区分属于不同的租户（或是说不同的用户组）的数据。关键是现实的方式必须对开发人员来说是透明的，不需要关注这个字段的信息，由后台或是封装在基类中实现数据的筛选和更新。

    基本原理

    从新用户注册时就必须指定用户的TenantId,我的例子是用CompanyId,公司信息做为TenantId,哪些用户属于不同的公司，每个用户将来只能修改和查询属于本公司的数据。

    接下来就是用户登录的时候获取用户信息的时候把TenantId保存起来，asp.net mvc（不是 core） 是通过 Identity 2.0实现的认证和授权，这里需要重写部分代码来实现。

    最后用户对数据查询/修改/新增时把用户信息中TenantId，这里就需要设定一个Filter(过滤器)和每次SaveChange的插入TenantId

    如何实现

    第一步，扩展 Asp.net Identity user 属性，必须新增一个TenantId字段,根据Asp.net Mvc 自带的项目模板修改IdentityModels.cs 这个文件

     1   // You can add profile data for the user by adding more properties to your ApplicationUser class, please visit http://go.microsoft.com/fwlink/?LinkID=317594 to learn more.
 2   public class ApplicationUser : IdentityUser
 3   {
 4     public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager, string authenticationType)
 5     {
 6       // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
 7       var userIdentity = await manager.CreateIdentityAsync(this, authenticationType);
 8       // Add custom user claims here
 9       userIdentity.AddClaim(new Claim("http://schemas.microsoft.com/identity/claims/tenantid", this.TenantId.ToString()));
10       userIdentity.AddClaim(new Claim("CompanyName", this.CompanyName));
11       userIdentity.AddClaim(new Claim("EnabledChat", this.EnabledChat.ToString()));
12       userIdentity.AddClaim(new Claim("FullName", this.FullName));
13       userIdentity.AddClaim(new Claim("AvatarsX50", this.AvatarsX50));
14       userIdentity.AddClaim(new Claim("AvatarsX120", this.AvatarsX120));
15       return userIdentity;
16     }
17     public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
18     {
19       // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
20       var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
21       // Add custom user claims here
22       return userIdentity;
23     }
24 
25     [Display(Name = "全名")]
26     public string FullName { get; set; }
27     [Display(Name = "性别")]
28     public int Gender { get; set; }
29     public int AccountType { get; set; }
30     [Display(Name = "所属公司")]
31     public string CompanyCode { get; set; }
32     [Display(Name = "公司名称")]
33     public string CompanyName { get; set; }
34     [Display(Name = "是否在线")]
35     public bool IsOnline { get; set; }
36     [Display(Name = "是否开启聊天功能")]
37     public bool EnabledChat { get; set; }
38     [Display(Name = "小头像")]
39     public string AvatarsX50 { get; set; }
40     [Display(Name = "大头像")]
41     public string AvatarsX120 { get; set; }
42     [Display(Name = "租户ID")]
43     public int TenantId { get; set; }
44   }
45 
46 
47 
48   public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
49   {
50     public ApplicationDbContext()
51         : base("DefaultConnection", throwIfV1Schema: false) => Database.SetInitializer<ApplicationDbContext>(null);
52 
53     public static ApplicationDbContext Create() => new ApplicationDbContext();
54 
55 
56   }
    View Code

    　　第二步 修改注册用户的代码，注册新用户的时候需要选择所属的公司信息

     1  [HttpPost]
 2     [AllowAnonymous]
 3     [ValidateAntiForgeryToken]
 4     public async Task<ActionResult> Register(AccountRegistrationModel viewModel)
 5     {
 6       var data = this._companyService.Queryable().Select(x => new ListItem() { Value = x.Id.ToString(), Text = x.Name });
 7       this.ViewBag.companylist = data;
 8 
 9       // Ensure we have a valid viewModel to work with
10       if (!this.ModelState.IsValid)
11       {
12         return this.View(viewModel);
13       }
14 
15       // Try to create a user with the given identity
16       try
17       {
18         // Prepare the identity with the provided information
19         var user = new ApplicationUser
20         {
21           UserName = viewModel.Username,
22           FullName = viewModel.Lastname + "." + viewModel.Firstname,
23           CompanyCode = viewModel.CompanyCode,
24           CompanyName = viewModel.CompanyName,
25           TenantId=viewModel.TenantId,
26           Email = viewModel.Email,
27           AccountType = 0
28           
29         };
30         var result = await this.UserManager.CreateAsync(user, viewModel.Password);
31 
32         // If the user could not be created
33         if (!result.Succeeded)
34         {
35           // Add all errors to the page so they can be used to display what went wrong
36           this.AddErrors(result);
37 
38           return this.View(viewModel);
39         }
40 
41         // If the user was able to be created we can sign it in immediately
42         // Note: Consider using the email verification proces
43         await this.SignInAsync(user, true);
44 
45         return this.RedirectToLocal();
46       }
47       catch (DbEntityValidationException ex)
48       {
49         // Add all errors to the page so they can be used to display what went wrong
50         this.AddErrors(ex);
51 
52         return this.View(viewModel);
53       }
54     }
    AccountController.cs

    第三步 读取登录用户的TenantId 在用户查询和新增修改时把TenantId插入到表中,这里需要引用

    Z.EntityFramework.Plus，这个是免费开源的一个类库，功能强大
     1  public StoreContext()
 2         : base("Name=DefaultConnection") {
 3       //获取登录用户信息,tenantid
 4       var claimsidentity = (ClaimsIdentity)HttpContext.Current.User.Identity;
 5       var tenantclaim = claimsidentity?.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid");
 6       var tenantid = Convert.ToInt32(tenantclaim?.Value);
 7       //设置当对Work对象进行查询时默认添加过滤条件
 8       QueryFilterManager.Filter<Work>(q => q.Where(x => x.TenantId == tenantid));
 9       //设置当对Order对象进行查询时默认添加过滤条件
10       QueryFilterManager.Filter<Order>(q => q.Where(x => x.TenantId == tenantid));
11     }
12 
13  public override Task<int> SaveChangesAsync(CancellationToken cancellationToken)
14     {
15       var currentDateTime = DateTime.Now;
16       var claimsidentity = (ClaimsIdentity)HttpContext.Current.User.Identity;
17       var tenantclaim = claimsidentity?.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid");
18       var tenantid = Convert.ToInt32(tenantclaim?.Value);
19       foreach (var auditableEntity in this.ChangeTracker.Entries<Entity>())
20       {
21         if (auditableEntity.State == EntityState.Added || auditableEntity.State == EntityState.Modified)
22         {
23           //auditableEntity.Entity.LastModifiedDate = currentDateTime;
24           switch (auditableEntity.State)
25           {
26             case EntityState.Added:
27               auditableEntity.Property("LastModifiedDate").IsModified = false;
28               auditableEntity.Property("LastModifiedBy").IsModified = false;
29               auditableEntity.Entity.CreatedDate = currentDateTime;
30               auditableEntity.Entity.CreatedBy = claimsidentity.Name;
31               auditableEntity.Entity.TenantId = tenantid;
32               break;
33             case EntityState.Modified:
34               auditableEntity.Property("CreatedDate").IsModified = false;
35               auditableEntity.Property("CreatedBy").IsModified = false;
36               auditableEntity.Entity.LastModifiedDate = currentDateTime;
37               auditableEntity.Entity.LastModifiedBy = claimsidentity.Name;
38               auditableEntity.Entity.TenantId = tenantid;
39               //if (auditableEntity.Property(p => p.Created).IsModified || auditableEntity.Property(p => p.CreatedBy).IsModified)
40               //{
41               //    throw new DbEntityValidationException(string.Format("Attempt to change created audit trails on a modified {0}", auditableEntity.Entity.GetType().FullName));
42               //}
43               break;
44           }
45         }
46       }
47       return base.SaveChangesAsync(cancellationToken);
48     }
49 
50     public override int SaveChanges()
51     {
52       var currentDateTime = DateTime.Now;
53       var claimsidentity =(ClaimsIdentity)HttpContext.Current.User.Identity;
54       var tenantclaim = claimsidentity?.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid");
55       var tenantid = Convert.ToInt32(tenantclaim?.Value);
56       foreach (var auditableEntity in this.ChangeTracker.Entries<Entity>())
57       {
58         if (auditableEntity.State == EntityState.Added || auditableEntity.State == EntityState.Modified)
59         {
60           auditableEntity.Entity.LastModifiedDate = currentDateTime;
61           switch (auditableEntity.State)
62           {
63             case EntityState.Added:
64               auditableEntity.Property("LastModifiedDate").IsModified = false;
65               auditableEntity.Property("LastModifiedBy").IsModified = false;
66               auditableEntity.Entity.CreatedDate = currentDateTime;
67               auditableEntity.Entity.CreatedBy = claimsidentity.Name;
68               auditableEntity.Entity.TenantId = tenantid;
69               break;
70             case EntityState.Modified:
71               auditableEntity.Property("CreatedDate").IsModified = false;
72               auditableEntity.Property("CreatedBy").IsModified = false;
73               auditableEntity.Entity.LastModifiedDate = currentDateTime;
74               auditableEntity.Entity.LastModifiedBy = claimsidentity.Name;
75               auditableEntity.Entity.TenantId = tenantid;
76               break;
77           }
78         }
79       }
80       return base.SaveChanges();
81     }
    DbContext.cs

    经过以上3步就实现一个简单的多租户查询数据的功能。

    希望对大家有用。
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  • 原文地址：https://www.cnblogs.com/neozhu/p/11489931.html
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