September 2017
Beginner to intermediate
396 pages
9h 46m
English
Content preview from Haskell Cookbook
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How it works...
In this recipe, we ran the migration against an empty database, and the migration created the schema from the scratch. When we modified the model, and ran the migration against the existing ship.db database, the migration detected the change, and created the migration script. It is a better idea to print the migration than run the migration. It would give a chance to rectify any errors in the migration.
In fact, in the example that we have seen, we have added an extra reference to Asset as a foreign key in Structure and Compartment. This would create a problem during migration, as we will not have reference to an asset in the old data.
As the recipe is being written, using the runMigration function against the SQLite database ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.