在运行更新数据库时，如何使用EF 5 Code First映射现有表并且_do_不创建/触摸它？

Question

I have an EF 5 Code First VS 2012 project and some entites. I use update-database to generate/seed the tables and data. However I have 4 existing tables with data, and I would like to map this tables to 4 POCO class, because I would like to access them via DbContext.

My problem if I create the entity POCO classes, and add the approprite

public DbSet<MyExternal> MyExternals { get; set; }

property to my DbContext class, when I run the update-database it tries to create the tables and exits with error "Table MyExternal is exists" or similar. I understand why is that, but my question: How to explain to the update-database process to not create/alter these tables?

Note: I know how to map tables to different names than class name etc, not this is my problem.

Answer 1

I know this question is rather old and probably answered by yourself, but the solution might be to create an empty migration:

public override void Up()
{
}

public override void Down()
{
}

Afterwards your Migration has stored the correct database model (in which your four tables are known) and everything should work out just fine