Entity Framework Code First Relationship Mapping Problem?

This will create EdmMetadata table which contains a hash of the current model. Every time you create an instance of your derived DbContext and you want to access the database, the context executes special query to get the stored hash. The context then compares the hash of the current model with the retrieved one.

If the hash is different it either executes database intializer or fires exception. When using this feature you can for example define initializer.

This is pretty important for the extensibility and maintainability of the application. It provides functionality for EF to notice schema changes and modify the database accordingly. Therefore allowing you to change your model code without having to worry about updating the database.

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