Update Entity-Framework-Core-Other-DBMS.md

remove "Change the Migrations DbContext" plate, because no need to manually set database provider after v2.9+
add "Change the Migrations DbContext Factory" plate, because the switch to MySQL, we also need to modify the DbContextOptionsBuilder
mark "DBMS restrictions" plate, Add history modification record

docs/zh-Hans/Entity-Framework-Core-Other-DBMS.md

@@ -62,22 +62,25 @@ MySQL连接字符串与SQL Server连接字符串不同. 所以检查你的解决
 
 通常需要更改 `.DbMigrator` 和 `.Web` 项目里面的 `appsettings.json` ,但它取决于你的解决方案结构.
 
-## 更改迁移DbContext
+## 更改迁移DbContext Factory
 
-MySQL DBMS与SQL Server有一些细微的差异. 某些模块数据库映射配置(尤其是字段长度)会导致MySQL出现问题. 例如某些[IdentityServer模块](Modules/IdentityServer.md)表就存在这样的问题,它提供了一个选项可以根据你的DBMS配置字段.
+启动模板包含***YourProjectName*MigrationsDbContextFactory**，这是EF Core控制台命令所必须的类（比如[Add-Migration](https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/#generating--running-migrations)和[Update-Database](https://docs.microsoft.com/en-us/ef/ef6/modeling/code-first/migrations/#generating--running-migrations)），在切换到MySql数据库时，我们同时也需要修改`DbContextOptionsBuilder`
 
-启动模板包含*YourProjectName*MigrationsDbContext,它负责维护和迁移数据库架构. 此DbContext基本上调用依赖模块的扩展方法来配置其数据库表.
+在 *YourProjectName*MigrationsDbContextFactory 类中找到以下代码：
 
-打开 *YourProjectName*MigrationsDbContext 更改 `builder.ConfigureIdentityServer();` 行,如下所示:
+````csharp
+var builder = new DbContextOptionsBuilder<TestMigrationsDbContext>()
+    .UseSqlServer(configuration.GetConnectionString("Default"));
+````
+
+将其替换为：
 
 ````csharp
-builder.ConfigureIdentityServer(options =>
-{
-    options.DatabaseProvider = EfCoreDatabaseProvider.MySql;
-});
+var builder = new DbContextOptionsBuilder<TestMigrationsDbContext>()
+    .UseMySql(configuration.GetConnectionString("Default"));
 ````
 
-然后 `ConfigureIdentityServer()` 方法会将字段长度设置为超过MySQL的限制. 如果在创建或执行数据库迁移时遇到任何问题请参考相关的模块文档.
+如果在创建或执行数据库迁移时遇到任何问题，请参考相关模块文档
 
 ## 重新生成迁移
 
@@ -105,5 +108,6 @@ builder.ConfigureIdentityServer(options =>
     options.DatabaseProvider = EfCoreDatabaseProvider.MySql;
 });
 ```
+v2.9+版本无需手动设置 ([版本历史](https://github.com/abpframework/abp/blob/dev/modules/identityserver/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerModelBuilderConfigurationOptions.cs))
 
-相关讨论: https://github.com/abpframework/abp/issues/1920
+相关讨论: https://github.com/abpframework/abp/issues/1920