将实体框架配置为在模型更改时不自动更新数据库

Question

我使用Entity Framework创建了一个项目，该项目使用Migrations更改数据库并创建其初始数据。

好的，但是当我更改某些类时，它们会自动更改数据库实体。我不想这种行为，我想更改模型，并为该更改创建一个迁移。

该怎么做？

    [DbConfigurationType(typeof(MySql.Data.EntityFramework.MySqlEFConfiguration))]
public class AcmeDBContext : DbContext
{


    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {


        modelBuilder.Configurations.Add(new AssociadoEntityConfiguration());
        modelBuilder.Configurations.Add(new DepartamentoEntityConfiguration());
        modelBuilder.Configurations.Add(new CategoriaEntityConfiguration());
        modelBuilder.Configurations.Add(new ProdutoEntityConfiguration());

        modelBuilder.Configurations.Add(new UsuarioEntityConfiguration());
        modelBuilder.Configurations.Add(new PermissaoEntityConfiguration());

        base.OnModelCreating(modelBuilder);
    }

    public AcmeDBContext()
        : base("CooperyaraDB")
    {

        Database.SetInitializer(new MigrateDatabaseToLatestVersion<AcmeDBContext, LogDataMigration>(true));
    }

    //db sets was where


}



public class FixedMySqlMigrationSqlGenerator : MySqlMigrationSqlGenerator
{
    public FixedMySqlMigrationSqlGenerator()
        : base()
    {

    }

    protected override MigrationStatement Generate(CreateIndexOperation op)
    {
        if (!op.IsUnique)
            op.AnonymousArguments.Add("Type", "BTrees");

        return base.Generate(op);
    }

}


public sealed class LogDataMigration : DbMigrationsConfiguration<AcmeDBContext>
{

    private static readonly HashSet<string> _InitializedConnections = new HashSet<string>(StringComparer.OrdinalIgnoreCase);

    private static readonly object _LockProxy = new object();

    public LogDataMigration()
    {

        AutomaticMigrationsEnabled = true;
        AutomaticMigrationDataLossAllowed = false;
        SetSqlGenerator("MySql.Data.MySqlClient", new FixedMySqlMigrationSqlGenerator());

    }

    protected override void Seed(AcmeDBContext context)
    {
        base.Seed(context);
    }
}