Jochen van Wylick Jochen van Wylick - 2 months ago 9
C# Question

Invalid object name 'dbo.TableName' when retreiving data from generated table

I'm using entity framework code first to create my tables. Please note - create the tables, not the DB, since I'm working on a hosted environment and I don't have a user that is allowed to create db's.

Committing a DB update works fine, but retreiving data gives the exception:


Exception Details: System.Data.SqlClient.SqlException: Invalid object name 'dbo.EventHosts'.


I've read that it happens because I'm not using EF Code First to create the DB. That's fine, but how do I elegantly solve this?

All the generated tables do not have a prefix like dbo. A solution like this doesn't work, and isn't elegant at all:

[Table("EventHosts", Schema = "")]

Answer

To answer your first question: use the schema created for you by your hosting provider.

To answer your second question: No there is currently no direct way to change the default schema globally because you cannot modify existing conventions or create new conventions. You can try to hack it.

For example you can override OnModelCreating and use reflection to get all DbSet<> properties declared in your context. Than you can just use simple loop on these properties and create ToTable mapping call with name of the property as table name and your custom schema. It will require some playing with reflection to make this work.

Alternatively you can try to do some reusable approach by implementing custom conventions. You can find many different articles about using your own conventions with EF. Some examples:

My high level untested idea is following same principle and create assembly level attribute which will be processed by the convention mechanism and applied on all your entities.