ASP.NET Azure MySQL代码优先迁移：表“ xxx”已存在

Question

I have this frustrating problem when trying to enable code migrations to create DB schema on azure MySql DB i got the:

[DbConfigurationType(typeof(MySqlEFConfiguration))]

specified to my data context and also

        var configuration = new App.Migrations.Configuration();
        var migrator = new DbMigrator(configuration);
        migrator.Update();

but a simple Table that contains only ID property and a String doesnt seem to work on Azure, it says Table 'xxx' already exists, and when it doesnt it gives another error saying Specified key was too long; max key length is 767 bytes

whats wrong with the MySQL and Code First schema generation? thanks

Answer 1

Issue is likely...

1. Your Entity Code
2. Your Seed Code
3. Table probably does already exist

I would recommend opening the Visual Studio 2015 SQL Server Object explorer and running a few queries on the tables in question or just see if those tables exist and what data is in them.

I also do not like code first migrations, for these sorts of reasons. I would recommend following this tutorial series.

https://channel9.msdn.com/Blogs/Have-you-tried-turning-it-off-and-on-again/Creating-a-Database-Project-for-Artificial-Intelligence

https://channel9.msdn.com/Blogs/Have-you-tried-turning-it-off-and-on-again/Deploying-Database-Projects-to-SQL-Azure

https://channel9.msdn.com/Blogs/raw-tech/AI-Part-3-Entity-Framework-and-Unit-Tests