在 ALinq 中使用事务

下面是 ALinq 使用事务的例子，比较简单，直接上代码：

var db = new AccessNorthwind("C:/Northwind.mdb") { Log = Console.Out };
db.DoTransaction(delegate()
{
    db.Customers.Update(o => new Customer { CompanyName = "XXXX" }, o => o.CustomerID == "kkkkk");
    db.Customers.Delete(o => o.CustomerID == "aaaaa");
});

public static partial class Utility
{
    public static void DoTransaction(this DataContext dc, Action func)
    {
        dc.Connection.Open();
        var tran = dc.Connection.BeginTransaction();
        dc.Transaction = tran;

        try
        {
            func();
            tran.Commit();
        }
        catch
        {
            tran.Rollback();
            throw;
        }
        finally
        {
            dc.Connection.Close();
        }
    }
}

有朋友问到，如果是用 SQL 的，怎么写， OK，再上一个 SQL 的例子：

var str = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Northwind.mdb";
new OleDbConnection(str).DoTransaction(delegate(IDbCommand command)
{
    command.CommandText = @"UPDATE [Customers]
                            SET [CompanyName] = @p0
                            WHERE [CustomerID] = @p1";
    command.Parameters.Add(new OleDbParameter("@p0", "XXXXX"));
    command.Parameters.Add(new OleDbParameter("@p1", "kkkkk"));
    command.ExecuteNonQuery();

    command.CommandText = @"DELETE FROM [Customers] WHERE [CustomerID] = @p0";
    command.Parameters.Add(new OleDbParameter("@p0", "aaaaa"));
    command.ExecuteNonQuery();
});

public static partial class Utility
{
    public static void DoTransaction(this DataContext dc, Action func)
    {
        dc.Connection.Open();
        var tran = dc.Connection.BeginTransaction();
        dc.Transaction = tran;

        try
        {
            func();
            tran.Commit();
        }
        catch
        {
            tran.Rollback();
            throw;
        }
        finally
        {
            dc.Connection.Close();
        }
    }
}