What happens when entity is tracked in Entity Framework Core?

What happens when entity is tracked in Entity Framework Core?

If an entity is tracked, any changes detected in the entity will be persisted to the database during SaveChanges (). Entity Framework Core will also fix-up navigation properties between entities that are obtained from a tracking query and entities that were previously loaded into the DbContext instance.

How to change tracking behavior in EF Core?

You can also change the default tracking behavior at the context instance level: Since a tracking query uses the change tracker, EF Core will do identity resolution in a tracking query. When materializing an entity, EF Core will return the same entity instance from the change tracker if it’s already being tracked.

When to use savechanges in Entity Framework 6?

Title = “The Great Gatsby”; context.SaveChanges() When the call to SaveChanges is made, Entity Framework is aware of what values have changed, what the new values are, and what the original values are. We need to access this information to accomplish the change tracking we want.

How to track entity change in a table?

Said table can be represented by this entity: Notice the property PrimaryKeyValue. Part of recording “which entity changed” is both which table changed (e.g. “Movie”, “Actor”, etc) and which specific record in that table changed (e.g. 1, 2, etc.).

How is EF Core used in no tracking queries?

EF Core used to do identity resolution in no-tracking queries. It used weak references to keep track of entities that had already been returned. So if a result set contained the same entity multiples times, you would get the same instance for each occurrence.

How are queries that return entity types tracked?

Tracking queries. By default, queries that return entity types are tracking. This means you can make changes to those entity instances and have those changes persisted by SaveChanges(). In the following example, the change to the blogs rating will be detected and persisted to the database during SaveChanges().

How are Poco classes mapped in Entity Framework?

In Entity Framework Code First approach, our POCO classes are mapped to the database objects using a set of conventions defined in Entity Framework.

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