Use new modelBuilder.IsUsingMySQL method.

modules/identityserver/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerDbContextModelCreatingExtensions.cs

@@ -78,7 +78,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
 
                 b.HasKey(x => new { x.ClientId, x.RedirectUri });
 
-                if (options.DatabaseProvider == EfCoreDatabaseProvider.MySql)
+                if (IsMySql(builder, options))
                 {
                     b.Property(x => x.RedirectUri).HasMaxLength(300).IsRequired();
                 }
@@ -96,7 +96,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
 
                 b.HasKey(x => new { x.ClientId, x.PostLogoutRedirectUri });
 
-                if (options.DatabaseProvider == EfCoreDatabaseProvider.MySql)
+                if (IsMySql(builder, options))
                 {
                     b.Property(x => x.PostLogoutRedirectUri).HasMaxLength(300).IsRequired();
                 }
@@ -127,7 +127,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
 
                 b.Property(x => x.Type).HasMaxLength(SecretConsts.TypeMaxLength).IsRequired();
 
-                if (options.DatabaseProvider == EfCoreDatabaseProvider.MySql)
+                if (IsMySql(builder, options))
                 {
                     b.Property(x => x.Value).HasMaxLength(300).IsRequired();
                 }
@@ -197,7 +197,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
                 b.Property(x => x.ClientId).HasMaxLength(PersistedGrantConsts.ClientIdMaxLength).IsRequired();
                 b.Property(x => x.CreationTime).IsRequired();
 
-                if (options.DatabaseProvider == EfCoreDatabaseProvider.MySql)
+                if (IsMySql(builder, options))
                 {
                     b.Property(x => x.Data).HasMaxLength(10000).IsRequired();
                 }
@@ -268,7 +268,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
                 b.Property(x => x.Type).HasMaxLength(SecretConsts.TypeMaxLength).IsRequired();
                 b.Property(x => x.Description).HasMaxLength(SecretConsts.DescriptionMaxLength);
 
-                if (options.DatabaseProvider == EfCoreDatabaseProvider.MySql)
+                if (IsMySql(builder, options))
                 {
                     b.Property(x => x.Value).HasMaxLength(300).IsRequired();
                 }
@@ -334,5 +334,13 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
                 b.HasIndex(x => x.Expiration);
             });
         }
+
+        private static bool IsMySql(
+            ModelBuilder modelBuilder,
+            IdentityServerModelBuilderConfigurationOptions options)
+        {
+            return options.DatabaseProvider == EfCoreDatabaseProvider.MySql ||
+                   modelBuilder.IsUsingMySQL();
+        }
     }
 }

modules/identityserver/src/Volo.Abp.IdentityServer.EntityFrameworkCore/Volo/Abp/IdentityServer/EntityFrameworkCore/IdentityServerModelBuilderConfigurationOptions.cs

@@ -1,4 +1,5 @@
-using JetBrains.Annotations;
+using System;
+using JetBrains.Annotations;
 using Volo.Abp.EntityFrameworkCore;
 using Volo.Abp.EntityFrameworkCore.Modeling;
 
@@ -6,6 +7,7 @@ namespace Volo.Abp.IdentityServer.EntityFrameworkCore
 {
     public class IdentityServerModelBuilderConfigurationOptions : AbpModelBuilderConfigurationOptions
     {
+        [Obsolete("No need to manually set database provider after v2.9+. If it doesn't set automatically, use modelBuilder.UseXXX() in the OnModelCreating method of your DbContext (XXX is your database provider name).")]
         public EfCoreDatabaseProvider? DatabaseProvider { get; set; }
 
         public IdentityServerModelBuilderConfigurationOptions(