What happens when you delete a custom entity?
When you delete a custom entity, the database tables that store data for that entity are deleted and all data they contain is lost. Any associated records that have a parental relationship to the custom entity are also deleted. For more information about parental relationships, see Create and edit entity relationships.
How to delete a record in Entity Framework?
Deleting Records in Entity Framework. Learn how to delete records from the database using Entity Framework. Deleting an entity is done using the Remove or RemoveRange method of the DbSet. Alternatively, you can also set the entity state as Deleted. We can delete records either in connected or disconnected Scenarios.
Is there a way to remove an entity from the database?
You can also use the Attach and remove method as shown below. Note that Attach will add the entity to the context in Unchanged state. You can delete the entity without loading from the database, provided you know the Primary key. The following example shows how to delete without loading from the database.
When to delete related data in EF Core?
If the key value specified in the Remove () or RemoveRange () method does not exist then EF Core will thrown exception of type DbUpdateConcurrencyException. If an entity has relationship with other entities such as one-to-one or one-to-many then deleting related data, when the root entity is deleted, depends on how the relationship is configured.
How to delete related entities in Entity Framework?
Now if we want to delete the Post entity and the related we can do this: var categories = db.Categories.Where (c => c.PostId == postEntity.Id); var tags = db.Tags.Where (c => c.PostId == postEntity.Id); var post = await db.Posts.FirstAsync (p => p.Id == postEntity.Id);
How are validations respected at the data entity level?
The validations are respected by data entities that are built by using those tables. Although these validations are intrinsic to the tables that back a data entity, validations can also be defined at the data entity level.
How are entity-based validations written in CUD?
Like table-based validations, entity-based validations can be written at the field level ( DataEntity.validateField ()) or the record level ( DataEntity.validateWrite () ). Table validations are fired automatically as a part of the CUD operations.