![]() ![]() csproj file and make sure they are included like this: If you are not using Visual Studio, just edit the. ![]() To make the SQL scripts embedded resources, you can right-click them in Visual Studio, go to properties, and change to embedded resources. However, you could create a migration for each script or run multiple scripts in a migration, but refer to them explicitly. Because I am simply generating all of my sprocs, I don’t really care what order they run. This code finds all resources that end in “.sql” and runs each of them. Using (StreamReader reader = new StreamReader(stream)) Using (Stream stream = assembly.GetManifestResourceStream(resourceName)) Var assembly = Assembly.GetExecutingAssembly() įoreach (string resourceName in resourceNames) Please validate your environments and take regular backups before doing ANY of these operations.Protected override void Up(MigrationBuilder migrationBuilder) Done safely and using migrations with care, this can be done with limited risk. Squashing migration histories can be somewhat scary however, they can substantially reduce the side of your code, as well as improve the overall execution time and performance of your application. If you are deploying to multiple environments, be sure to complete this final Purge/Insert process to the history table BEFORE trying to execute any migrations against the target database, as otherwise you will cause major problems. Purge & Update Script TRUNCATE TABLE _EFMigrationsHistory We can do this by utilzing the following two statements, BE SURE TO UPDATE TO MATCH YOUR SCRIPT before executing as your values WILL be different than these. The final step is to clear the existing historical records and insert our single entry to indicate that the current database version is, in fact, the same. VALUES (N'20230108060418_Reset-Structure', N'6.0.0') Ĭopy this value for the next step, as we will remove the CURRENT migration history and insert this single entry to our database. ![]() New Migration History Entry INSERT INTO (, ) Just before the "COMMIT" statement, you should see a script similar to the following, with the current date. This will place a file "MigrationScript.sql" in the root of your project open this file and scroll to the VERY bottom. Scripting the Migrations dotnet ef migrations script -o MigrationScript.sql You can do this using the following command. Now that we have created the new migration, we need to script the migration, so we can do any needed validation against a blank database, and also to be able to obtain the needed history entry for the final deployment steps. This will create your new migration but will NOT do any database updates, which is important! Script Migration & Extract History Entry Creating A New Migration dotnet ef migrations add Reset-Structure The below is an example of the standard command that I use. You can do this using the command line, or package manager console just as you would with any other migration. Now that your project has been cleaned, it is time to create the new migration. DO NOT make any changes to the actual database yet! Create a New Initial Migration This will remove all historical migrations from the code base. Within your EntityFrameworkCore project, find the "migrations" folder and simply delete the folder. Once your backups are fully in place, the steps to migrate are actually pretty simple. Doing so will ensure that you can quickly revert to the old state without impact if any abnormality occurs. I strongly recommend backing up everything, including ensuring this is done with a clean, single commit within your source control system. Using comparison tools such as these can help spot structural deficiencies. If you are unsure if this applies to you, I would suggest utilizing a test database and using a tool such as SQL Compare or otherwise to compare the schema of your real database to that of a blank database created using the new "initial" migration that is created from this process. When resetting migrations, your squashed migration history may not result in the same database model being created, and future migrations may be incorrect. However, if you find yourself manually editing migrations regularly, this operation can be hazardous. Special Considerations for Manual Migration ChangesĪssuming that you are following best practices and NOT manually editing Migration files from their auto-generated state, this process is relatively safe. Microsoft has published guidance that discusses the process as a whole, but in this post, I'll dive into the actual operations. Resetting your migrations to squash the history can be a very helpful process. Additionally, changes can occur within Entity Framework tooling that may result in code warnings or other similar concerns. Projects can evolve over time, and the history of granular migrations within Entity Framework can result in a bloated change history. ![]()
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