Question

我正在尝试使用fastcrud制作UnitOfWork / Repository模式。

我已经创建了一个通用存储库

public interface IRepository<T> where T : BaseEntity
{
    IDbTransaction Transaction { get; set; }

    T Get(T entityKeys, Action<ISelectSqlSqlStatementOptionsBuilder<T>> statementOptions = null);

    IEnumerable<T> Find(Action<IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<T>> statementOptions = null);

    int Count(Action<IConditionalSqlStatementOptionsBuilder<T>> statementOptions = null);
    bool Delete(T entityToDelete, Action<IStandardSqlStatementOptionsBuilder<T>> statementOptions = null);
}

通过我致电的服务

        var repo = UnitOfWork.GetRepository<MyTable>();

        var myList = repo.Find(statement => statement
            .AttachToTransaction(repo.Transaction)
            .OrderBy($"{nameof(MyTable.Name):C}")
        );

这有效。但是我不希望该服务处理AttachToTransaction调用，而是希望将其添加到我的存储库中

    public IEnumerable<T> Find(Action<IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<T>> statementOptions = null)
    {
        return Connection.Find<T>(statementOptions);
    }

但是这里的statementOption是委托的操作，我不能做

statementOption.AttachToTransaction(this.Transaction)

我的UnitOfWork始终创建一个事务，因此，如果我跳过附加到事务的操作，将会得到异常

An unhandled exception occurred while processing the request.
InvalidOperationException: ExecuteReader requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized.

Answer 1

您可以这样做：

public IEnumerable<T> Find(Action<IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<T>> statementOptions = null)
{
     statementOptions += s => s.AttachToTransaction(this.Transaction);
     return Connection.Find<T>(statementOptions);
}

Answer 2

我也有同样的问题。我已经使用这种扩展方法解决了它：

internal static IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<TEntity> AttachToTransaction<TEntity>(
                        this IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<TEntity> statement,
                        Action<IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<TEntity>> originalStatementOptionsBuilder,
                        IDbTransaction transaction)
{
  if (originalStatementOptionsBuilder == null)
  {
    statement.AttachToTransaction(transaction);
  }
  else
  {
    originalStatementOptionsBuilder(statement);
    statement.AttachToTransaction(transaction);
  }

  return statement;
}

现在您的服务必须像这样更改：

public IEnumerable<T> Find(Action<IRangedBatchSelectSqlSqlStatementOptionsOptionsBuilder<T>> statementOptions = null)
{
  return Connection.Find<T>(s => s.AttachToTransaction(statementOptions, this.Transaction));
}

将AttachToTransaction添加到FastCrud中的操作

2 个答案: