Pomelo.entityframeworkcore.mysql: Microsoft.EntityFrameworkCore.Database.Command Failed executing DbCommand (rename)

Created on 6 Jul 2020 · 4Comments · Source: PomeloFoundation/Pomelo.EntityFrameworkCore.MySql

Steps to reproduce

when creating a migration to rename a column you get an exception

The issue

The command to rename the column is not that of mysql

migrationBuilder.RenameColumn(
name: "Name",
table: "User",
newName: "Username");

Microsoft.EntityFrameworkCore.Database.Command[20102] Failed executing DbCommand (5ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] ALTER TABLE `User` RENAME COLUMN `Name` TO `Username`; Failed executing DbCommand (5ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] ALTER TABLE `User` RENAME COLUMN `Name` TO `Username`;

Further technical details

MySQL version: 5.7.30-log MySQL Community Server
Operating system: Windows 10 Pro
Pomelo.EntityFrameworkCore.MySql version: 3.1.1
Microsoft.AspNetCore.App version: 3.1

Other details about my project setup:
All other migrations went smoothly, including AlterColumn and AddColumn

closed-question type-question

Source

rafaeldoria

Most helpful comment

Your Startup.cs requires ServerVersion(new Version(5, 7, 30), ServerType.MySql) so that Pomelo knows which dialect of MySql to use.

For example:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(options =>
                options.UseMySql(connectionString,
                    o => o.ServerVersion(new Version(5, 7, 30), ServerType.MySql)
    );

    // ...
}

Does the issue persist after adding this?

crozone on 7 Jul 2020

👍3 🎉1

All 4 comments

Have you set ServerVersion? In your case ServerVersion(new Version(5, 7, 30), ServerType.MySql)

mguinness on 6 Jul 2020

Check mysql config

rafaeldoria on 7 Jul 2020

Your Startup.cs requires ServerVersion(new Version(5, 7, 30), ServerType.MySql) so that Pomelo knows which dialect of MySql to use.

For example:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(options =>
                options.UseMySql(connectionString,
                    o => o.ServerVersion(new Version(5, 7, 30), ServerType.MySql)
    );

    // ...
}

Does the issue persist after adding this?

crozone on 7 Jul 2020

👍3 🎉1

great!
it worked, thanks!!!

rafaeldoria on 7 Jul 2020

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