以编程方式从EDMX生成DDL

Question

I want to create a deployment page in my web application. I would also like to use the same method to create an upgrade page for the database. I use the following code to generate the DDL sql scripts for the EDMX file i have.

IObjectContextAdapter context = new ApplicationDBContext();
var sqlScript = context.ObjectContext.CreateDatabaseScript();

this generates a creation script for the entire database.

I would like it to create a DDL script that will use IF EXSISTS and DROP CREATE decleartion to reset the existing database.

is it possible ?

I would also like to have a toggle that will upgrade the current database only adding the new fields and tables that does not exist.

is it also possible ?

Answer 1

Checkout context.Database property. You will find a lot of useful methods in it. You basically can check if database exists, drop, create database, check if it is compatible with your model.

Also consider Entity Framework Migrations. This is a modern way to handle database changes.