Does TransactionScope work with Entity Framework?

Entity Framework is already operating within a TransactionScope. The connection object in the transaction passed is null. That is, the transaction is not associated with a connection – usually this is a sign that that transaction has already completed.

What is TransactionScope in C#?

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 ambient transaction automatically.

How do you use TransactionScope?

Using the TransactionScope

1. Add a reference to System.
2. Add a using System.
3. Make sure that the Microsoft Distributed Transaction Coordinator is running.
4. Create the TransactionScope object in a using statement.
5. Complete all updates within the scope defined by the {} of the TransactionScope’s using statement.

What’s the difference between SaveChanges () and AcceptAllChanges ()?

The AcceptAllChanges method is useful in the scenario where a transaction has failed and a user wants to retry. If you call SaveChanges() or SaveChanges(true),the EF simply assumes that if its work completes okay, everything is okay, so it will discard the changes it has been tracking, and wait for new changes.

What is lazy loading in Entity Framework?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

How does Entity Framework handle concurrency?

The general approach to handle a concurrency conflicts is:

1. Catch DbUpdateConcurrencyException during SaveChanges .
2. Use DbUpdateConcurrencyException.
3. Refresh the original values of the concurrency token to reflect the current values in the database.
4. Retry the process until no conflicts occur.

How do I rollback a TransactionScope?

If you want to rollback a transaction, you should not call the Complete method within the transaction scope. For example, you can throw an exception within the scope. The transaction in which it participates in will be rolled back.

What does @transactional annotation do?

The @Transactional annotation makes use of the attributes rollbackFor or rollbackForClassName to rollback the transactions, and the attributes noRollbackFor or noRollbackForClassName to avoid rollback on listed exceptions. The default rollback behavior in the declarative approach will rollback on runtime exceptions.

How do I rollback a Transactionscope?

What is the difference between ObjectContext and DBContext?

DbContext is nothing but a ObjectContext wrapper, we can say it is a lightweight alternative to the ObjectContext….ObjectContext VS DBContext.

ObjectContext	DbContext
ObjectContext can be used by Entity Framework 4.0 and below.	DBContext can be used by Entity Framework 4.1 and above.

Which entity will allow lazy loading?

Yes, lazy loading is enabled in the Entity Framework ORM too, it is on by default in Entity Framework, so if you want to enable lazy loading in Entity Framework, you don’t need to do anything.

How do I avoid concurrency in Entity Framework?

How do you deal with concurrency issues?

The best approach to managing concurrency is to add a timestamp column to the table. The timestamp type is supported by most databases and doesn’t actually contain a time and date; it’s a binary value that is unique within the database.

What is Msdtc SQL Server?

Microsoft Distributed Transaction Coordinator (MSDTC) is a transaction manager that makes it possible for client applications to work with multiple sources of data in one transaction. When a distributed transaction spans two or more servers, the servers coordinate the management of the transaction by using MSDTC.

What is System transaction?

System. Transactions defines three levels of trust that restrict access on the types of resources it exposes. Specifically, the System.

Why is @transactional used?

@Transactional annotation is used when you want the certain method/class(=all methods inside) to be executed in a transaction.

When should we use @transactional annotation?

What is DbContext and DbSet?

Intuitively, a DbContext corresponds to your database (or a collection of tables and views in your database) whereas a DbSet corresponds to a table or view in your database. So it makes perfect sense that you will get a combination of both!

What is DbSet and ObjectSet in Entity Framework?

It discovers entity sets based on DbSet properties defined on the DbContext derived class (or in general, it discovers your model based on your code). ObjectContext does not do any discovery and is not convention based. It just reads your model from csdl, ssdl and msl artifacts.

Which framework is better than Entity Framework?

With EF you can focus more on a domain first approach since the data layer is completely abstracted for you.

Transactions and rollbacks are managed for you.

It’s faster to develop with since you can get it up and running in seconds.

It gives you source control of any schema changes with the possibility to do rollbacks through a command.

What is the function of Entity Framework?

Entity Framework is Microsoft’s recommended data access technology for new applications.

ADO.NET seems to refer directly to the technology for data sets and data tables.

Entity Framework is where all of the forward moving investment is being made,which has been the case for a number of years already.

What is Entity Framework model?

Visual Studio also provides Entity Designer,for visual creation of the EDM and the mapping specification.

The output of the tool is the XML file (*.edmx) specifying the schema and the mapping.

Edmx file contains Entity Framework metadata artifacts.

How to implement ambient transaction in Entity Framework Core?

Entity Framework already has an existing transaction

Entity Framework is already operating within a TransactionScope

The connection object in the transaction passed is null.

The connection object in the transaction passed does not match the Entity Framework’s connection.