Is SaveChanges a transaction?
In Entity Framework, the SaveChanges() method internally creates a transaction and wraps all INSERT, UPDATE and DELETE operations under it. Multiple SaveChanges() calls, create separate transactions, perform CRUD operations and then commit each transaction.
What is entity transaction?
public interface EntityTransaction. Interface used to control transactions on resource-local entity managers. The EntityManager. getTransaction() method returns the EntityTransaction interface.
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.
Does EF core use transactions?
Savepoints. Within a given transaction, when SaveChanges operations performed multiple times, EF core automatically creates a savepoint for every SaveChanges call. If SaveChanges fail due to any reason, the transaction can be rolled back until last successful Savepoint .
What is a transaction scope?
The TransactionScope class provides a simple way to mark a block of code as participating in a transaction, without requiring you to interact with the transaction itself. A transaction scope can select and manage the ambient transaction automatically.
What context SaveChanges return?
Returns. The number of state entries written to the underlying database.
How does Entity Framework transactions work?
Entity Framework internally maintains transactions when the SaveChanges() method is called. It means the Entity Framework maintains a transaction for the multiple entity insert, update and delete in a single SaveChanges() method. When we execute another operation, the Entity Framework creates a new transaction.
What is TransactionScope in C#?
TransactionScope is a class that makes code block transactions after a certain time. The TransactionScope makes the block of code as a part of a transaction without requesting c# developers to connect with the transaction itself. A TransactionScope is allowed to select and manage transaction environments automatically.
What does DB SaveChanges return?
Does SaveChanges commit?
A sql transaction is a single ‘atomic’ change. That is to say that either all the changes are committed, or none are committed. That’s why you would use a sql transaction, to wrap both SaveChanges into a single operation that means either all data is committed, or none is committed.
What is an ambient transaction?
Ambient Transaction A transaction which automatically identifies a code block that needs to support a transaction without explicitly mentioning any transaction related things. An ambient transaction is not tied just to a database, any transaction aware provider can be used.
What is transaction scope C#?
When to use savechanges false or acceptallchanges ( )?
This creates a transaction, or enlists in any ambient transaction, and does all the necessary work in that transaction. Sometimes though the SaveChanges (false) + AcceptAllChanges () pairing is useful. The most useful place for this is in situations where you want to do a distributed transaction across two different Contexts.
What’s the use of savechanges in Entity Framework?
With the Entity Framework most of the time SaveChanges() is sufficient. This creates a transaction, or enlists in any ambient transaction, and does all the necessary work in that transaction. Sometimes though the SaveChanges(false) + AcceptAllChanges() pairing is useful.
When does savechanges throw an optimisticconcurrencyexception?
SaveChanges operates within a transaction. SaveChanges will roll back that transaction and throw an exception if any of the dirty ObjectStateEntry objects cannot be persisted. If an optimistic concurrency violation has occurred, an OptimisticConcurrencyException is thrown.
What happens if the second call to savechanges fails?
The first call adds the first Customer to the database and the second call adds the other Customer to the database. If the second call to SaveChanges () fails for some reason the first Customer still gets added to the database because each call to SaveChanges () runs in its own transaction. Now let’s modify this code as shown below: