At a high level, migrations function in the following way: When you create or apply a migration, the projects containing the migrations and the DbContext definition are compiled and inspected. Migrations must be able to see the database model to work. The same tool can then be used to point a migration at an existing database and deploy the data definition language (DDL) necessary to bring the database in sync with the model. After making modifications to your model that may change the schema, you can use the EF Core Command Line Interface (CLI) to capture the snapshot in a migration. A migration is essentially a mini-snapshot of a “point-in-time” of your database model. Transformed or even transferred while the changes are applied, and modern applications are expected to run with minimal downtime.Ī major benefit of using EF Core is the ability to manage schema changes through a mechanism called migrations. The data in existing columns may need to be Not onlyĭo the code and data need to remain in synch, but alterations to schema definitions can cause side effects that ripple across tables. On the other hand, updates that involve changes to the database are inevitably more complex. Replacing binary files or pointing the load balancer to new nodes. Updates to code can often be deployed simply by The changes are reflected in your code, your schema, and your data. Today, the EF Core team would like to introduce you to a new feature that shipped in our latest preview release: migration bundles.īusiness applications evolve with time.
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