MySQL with EF Core 9 in ABP: Avoiding Translation Issues #8739

What is the problem?

We are using Pomelo.EntityFrameworkCore.MySql NuGet package in our MySQL provider package, which is Volo.Abp.EntityFrameworkCore.MySQL. This package hasn't released a stable version for .NET 9 yet.

Therefore, the provider is unable to transform/process some SQL queries, we are closely following the stable 9.0.0 release of the Pomelo.EntityFrameworkCore.MySql package and we will update our provider when they release the stable version. (You can also follow the upgrade status from https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/issues/1841, if you want)

When using EF Core 9 with MySQL in ABP-based projects, you may encounter SQL translation issues. One of the key problems is that certain queries involving parameterized collections fail to translate correctly.

How to fix this problem?

To fix this problem, you can open your module class of the *.EntityFrameworkCore project and configure the AbpDbContextOptions as follows:

//...

public class MyProjectEntityFrameworkCoreModule : AbpModule
{
    public override void ConfigureServices(ServiceConfigurationContext context)
    {

        //...

        Configure<AbpDbContextOptions>(options =>
        {
            options.UseMySQL(builder =>
            {
                //add the following line 👇
                builder.TranslateParameterizedCollectionsToConstants();
            });
        });

    }
}

Using the TranslateParameterizedCollectionsToConstants() option ensures that parameterized collections are translated into constants, preventing SQL translation errors.

✍️ You can read this article for further information: https://dev.to/engincanv/mysql-with-ef-core-9-in-abp-avoiding-translation-issues-1il1