Explain the database transactions in .NET Core.

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Aryan Kumar · Answer

Database transactions in .NET Core are a crucial mechanism for ensuring data consistency and integrity when interacting with a database. Transactions allow you to group one or more database operations into a single unit of work, ensuring that all operations either succeed together or fail together. Here's an explanation of database transactions in .NET Core:
Transaction Scope:
.NET Core provides the System.Transactions.TransactionScope class to manage transactions. This class allows you to define a scope for a transaction and encloses a block of code that performs database operations.
Atomicity:
One of the key principles of transactions is atomicity, which means that a transaction is treated as a single, indivisible unit of work. All operations within the transaction are either committed together if all succeed or rolled back if any operation fails.
Isolation:
Transactions provide isolation between different transactions. Isolation levels, such as Read Uncommitted, Read Committed, Repeatable Read, and Serializable, determine the level of visibility and locking of data during transactions. You can specify the isolation level according to your application's requirements.
Consistency:
Transactions ensure data consistency by preventing intermediate states. If an operation within a transaction fails, all changes made by previous operations in the transaction are rolled back, leaving the database in a consistent state.
Durability:
Transactions guarantee durability, meaning that once a transaction is committed, its changes are permanently saved in the database, and they will survive any system failures or crashes.
Transaction Rollback:
If any operation within a transaction fails, you can explicitly roll back the entire transaction to undo all changes made within it.
Nested Transactions:
.NET Core allows nesting transactions within other transactions. Inner transactions can be treated as savepoints, and they can be rolled back or committed independently of the outer transaction.
Multiple Resource Managers:
TransactionScope can work with multiple resource managers, meaning you can include multiple databases or other transactional resources (e.g., message queues) within the same transaction.
Here's an example of using TransactionScope in a .NET Core application:
using (var scope = new TransactionScope())
{
    try
    {
        // Perform database operations within the transaction
        using (var dbContext = new YourDbContext())
        {
            // Insert, update, or delete records in the database
        }
        // If everything succeeds, commit the transaction
        scope.Complete();
    }
    catch (Exception ex)
    {
        // If an exception occurs, the transaction is rolled back
    }
}
In the above code, all database operations within the TransactionScope will either be committed together when
scope.Complete() is called or rolled back if an exception occurs.
Database transactions are essential for maintaining data integrity and consistency in applications, particularly when dealing with concurrent access and complex operations that span multiple database tables or systems. They ensure that your application maintains a consistent and reliable state even in the presence of errors or unexpected events.

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Explain the database transactions in .NET Core.

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