13 efcore pemolo unitofwork

ADNC Repository Usage: Transactions and Unit of Work

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This article introduces transaction management and the Unit of Work pattern in ADNC.

EF Core Transactions

EF Core supports three types of transactions:

• SaveChanges
• DbContextTransaction
• TransactionScope

By default, EF Core's SaveChangesAsync wraps operations in a transaction as needed. However, there are exceptions in ADNC:

1. Bulk Operations: ExecuteUpdateAsync and ExecuteDeleteAsync bypass the change tracker and are not controlled by SaveChanges.
2. CAP Transactions: CAP operations are outside the standard SaveChanges scope.
3. Raw SQL: Native SQL execution is not managed by SaveChanges.

Unit of Work Implementation

ADNC uses DbContextTransaction to unify transaction control. If your business logic involves multiple write operations (≥ 2), it is recommended to explicitly enable transaction control.

Using Interceptors (Declarative)

The easiest way to use transactions is via the [UnitOfWork] attribute on service interfaces in the Application.Contracts layer.

// Local Transaction
[UnitOfWork]
Task<AppSrvResult> UpdateAsync(long id, DeptUpdationDto input);

// Distributed Transaction (CAP)
[UnitOfWork(Distributed = true)]
Task<AppSrvResult> ProcessPayingAsync(long transactionLogId, long customerId, decimal amount);

The framework automatically manages the transaction lifecycle (Begin, Commit, Rollback) through an interceptor.

Manual Transaction Control

If you prefer manual control or have complex requirements, you can inject IUnitOfWork into your service:

public class xxxAppService
{
    private readonly IUnitOfWork _uow;
    public xxxAppService(IUnitOfWork uow) => _uow = uow;

    public async Task DemoMethod()
    {
        try
        {
            await _uow.BeginTransactionAsync(distributed: false);
            // Operation 1
            // Operation 2
            await _uow.CommitAsync();
        }
        catch (Exception)
        {
            await _uow.RollbackAsync();
            throw;
        }
    }
}

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