使用EF5 CodeFirst迁移的MySql:更改表列名时出错（Fluent API）

我在MySql数据库中使用EF5 CodeFirst

我有一个“用户”类

public class User
{
    [Key]
    public string Username { get; set; }
    public string DisplayName { get; set; }
}

我想将表列DisplayName更改为display\u name

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<User>()
            .Property(u => u.DisplayName)
            .HasColumnName("display_name");
    }

我认为错误在这里->

set @columnType := (select case lower(IS_NULLABLE) when `no` then CONCAT(column_type, ` ` , `not null `)  when `yes` then column_type end from information_schema.columns where table_name = `Users` and column_name = `DisplayName` );

否

是错误

请帮我纠正这个错误

set @columnType := (select case lower(IS_NULLABLE) when `no` then CONCAT(column_type, ` ` , `not null `)  when `yes` then column_type end from information_schema.columns where table_name = `Users` and column_name = `DisplayName` );