c# - 使用 foreachloop 将数据插入数据库

Question

我正在使用 foreach 循环

foreach(var x in items)
{
    // enter code here
}

在我的代码中，我将数据发送到数据库假设在我的items列表中我有 10 条记录在发送 5 条记录后由于某些问题发送到数据库，发送数据失败如何回滚我发送到的所有数据database。

有什么办法可以处理这种情况-我正在使用实体数据模型

Answer 1

如何回滚我发送到数据库的所有数据。

将事务与您的插入命令一起使用。如果您的目标数据库是 SQL Server，那么您会导致SqlTransaction带有try/catch块，因此如果发生异常，您可以Rollback进行事务。

来自 MSDN 的示例

private static void ExecuteSqlTransaction(string connectionString)
{
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        SqlCommand command = connection.CreateCommand();
        SqlTransaction transaction;

        // Start a local transaction.
        transaction = connection.BeginTransaction("SampleTransaction");

        // Must assign both transaction object and connection 
        // to Command object for a pending local transaction
        command.Connection = connection;
        command.Transaction = transaction;

        try
        {
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Attempt to commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
            Console.WriteLine("  Message: {0}", ex.Message);

            // Attempt to roll back the transaction. 
            try
            {
                transaction.Rollback();
            }
            catch (Exception ex2)
            {
                // This catch block will handle any errors that may have occurred 
                // on the server that would cause the rollback to fail, such as 
                // a closed connection.
                Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
                Console.WriteLine("  Message: {0}", ex2.Message);
            }
        }
    }
}