What does DB SaveChanges return?

What does DB SaveChanges return?

Returns. The number of state entries written to the underlying database. This can include state entries for entities and/or relationships.

How do I use SaveChanges in Entity Framework?

SaveChanges method saves all changes made in the context of the database.

1. You can add, modify, and remove data using your context and entity classes.
2. SaveChanges method automatically call DetectChanges method to discover any changes to entity instances before saving to the underlying database.

When should I call SaveChanges?

If you need to enter all rows in one transaction, call it after all of AddToClassName class. If rows can be entered independently, save changes after every row. Database consistence is important.

How do I override SaveChanges in Entity Framework?

In this article you will learn how to override SaveChanges in Entity Framework….Now let’s analyze this “SaveChanges()” method.

1. var selectedEntityList = ChangeTracker.Entries()
2. .Where(x => x.Entity is EntityInformation &&
3. (x. State == EntityState. Added || x. State == EntityState. Modified));

How does DB SaveChanges work?

SaveChanges() method is used by Entity Framework to save current changes to the database and ModelState represents validation errors when e.g. the model is not valid. msdn says : It persists all updates to the data source and resets change tracking in the object context.

How do I rollback Entity Framework?

A DbContextTransaction object provides Commit() and Rollback() methods to do commit and rollback on the underlying store transaction. This method requires an open underlying stored connection. This method opens a connection if it is not already open. This method will close the connection when Dispose () is called.

What is SaveChanges entity framework?

In Entity Framework, the SaveChanges() method internally creates a transaction and wraps all INSERT, UPDATE and DELETE operations under it. Thus, each SaveChanges() method call creates a new transaction and executes database commands within it.

How do I insert multiple rows in Entity Framework?

You can add multiple records or multiple objects using the AddRange method of DbSet as shown in the following code. The code creates a list of department objects and inserts two new departments to the list. We add the list to the context using the AddRange method.

What does Entity Framework do?

The Entity Framework enables developers to work with data in the form of domain-specific objects and properties, such as customers and customer addresses, without having to concern themselves with the underlying database tables and columns where this data is stored.