Adding new DBs for each created tenant for each ServiceModule(feature) #8949

4 Answer(s)

• 

  0

  Ehab@Siemat created 3 days ago

  and if i have an EditionId, how to get the features related to it?

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  enisn created 3 days ago

  Support Team .NET Developer

  Hi,

  ABP Framework allows tenants to use separate databases and Saas module has an UI to separate tenant databases manually at runtime. But there is no built-in feature for creating databases dynamically whenever a tenant created or edition changes for a tenant. You have to implement it in your application according to your logic.

  Let me show the TenantAppService.cs implementation from the Saas Module:

  

  If you create each tenant with ConnectionStrings property is configured and make sure distributed event is published, you can achieve this logic.

  You don't have to write all the codes here, I just wanted to explain the logic. You can easily replace TenantAppService in your application and configure connection string for each tenant dynamically:

  [Dependency(ReplaceServices = true)]
  [ExposeServices(typeof(ITenantAppService))]
  public class CustomTenantAppService : TenantAppService
  {
      public CustomTenantAppService(ITenantRepository tenantRepository, IEditionRepository editionRepository, ITenantManager tenantManager, IDataSeeder dataSeeder, ILocalEventBus _localEventBus, IDistributedEventBus distributedEventBus, IOptions<AbpDbConnectionOptions> dbConnectionOptions, IConnectionStringChecker connectionStringChecker) : base(tenantRepository, editionRepository, tenantManager, dataSeeder, _localEventBus, distributedEventBus, dbConnectionOptions, connectionStringChecker)
      {
      }
  
      public override Task<SaasTenantDto> CreateAsync(SaasTenantCreateDto input)
      {
          // 👇 Something similar
          input.ConnectionStrings.Default = $"Server=localhost;Database=MyProjectName_{input.Name.Normalize()};User=root;Password=123456;";
          return base.CreateAsync(input);
      }
  }
  

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  Ehab@Siemat created a day ago

  I have two questions plz:

  1- How can we specify which service tenant database a microservice should work with (e.g., Microservice_Tenant1_Products, Microservice_Tenant2_Products, etc.)?

  2- When we add new database migrations at the service, how should we handle them considering that each tenant has its own separate service database? how this migration will be applied to all service tenant dbs?

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  0

  enisn created about 20 hours ago

  Support Team .NET Developer

  Hi

  How can we specify which service tenant database a microservice should work with (e.g., Microservice_Tenant1_Products, Microservice_Tenant2_Products, etc.)?

  Do you use micro-serivce template currently or you'll separate your services later? By default we don't suggest using different databases for tenants in the micro-service template currently, if you wish you can rea the discussion from here: https://abp.io/support/questions/8692/Problems-configuring-a-separate-database-for-each-tenant-in-a-microservices-application

  If your template is not micro-service, you can customize MultiTenantConnectionStringResolver in your application

  https://github.com/abpframework/abp/blob/74d516829be7f05cfae7d4a67f18591b41e5446a/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs#L76-L79

  using System;
  using Microsoft.Extensions.Options;
  using Volo.Abp.Data;
  using Volo.Abp.DependencyInjection;
  using Volo.Abp.MultiTenancy;
  
  namespace AbpSolution1.AuthServer;
  
  [Dependency(ReplaceServices = true)]
  [ExposeServices(typeof(IConnectionStringResolver), typeof(DefaultConnectionStringResolver))]
  public class MicroServiceConnectionStringResolver : MultiTenantConnectionStringResolver
  {
      private readonly ICurrentTenant _currentTenant;
      private readonly IServiceProvider _serviceProvider;
      public MicroServiceConnectionStringResolver(IOptionsMonitor<AbpDbConnectionOptions> options, ICurrentTenant currentTenant, IServiceProvider serviceProvider) : base(options, currentTenant, serviceProvider)
      {
          _currentTenant = currentTenant;
          _serviceProvider = serviceProvider;
      }
  
      public override async Task<string> ResolveAsync(string? connectionStringName = null)
      {
          // ⚠️ Implement Your own logic, this is for demonstration
          var prefix = "Microservice";
          var postfix="Products";
          var tenant = _currentTenant.Name;
  
          // ...
          
          return $"Server=myServerAddress;Database={prefix}_{tenant}_{postfix};Trusted_Connection=True;"
  
      }
  }
  

  When we add new database migrations at the service, how should we handle them considering that each tenant has its own separate service database? how this migration will be applied to all service tenant dbs?

  DbMigrator project applies migrations for all the tenants in the host database. So whenever you run DbMigrator, all the databases will be migrated and data seed will be executed

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