Question

考虑以下表格方案：

T2 --> T1 <-- T3

T2指的是T1，T3指的是T1，因此我无法删除T2或T3中引用的T1行。

现在，使用以下代码：

using (var sqlConnection = new SqlConnection(ConnectionString))
{
    sqlConnection.Open();

    using (SqlCommand sqlCommand = sqlConnection.CreateCommand())
    {
        sqlCommand.CommandText = "USE [TransactionScopeTests]; DELETE FROM T3; DELETE FROM T1;"; // DELETE FROM T1 will cause violation of integrity, because rows from T2 are still using rows from T1.

        sqlCommand.ExecuteNonQuery();
    } 
}

此代码在SQL Server 2014 LocalDb或Sql Server 2012 Developer Edition上执行，产生相同的结果。表T3为空，但表T1保持不变。

将探查器连接到此查询会导致执行以下SQL：

Audit Login：

-- network protocol: Named Pipes
set quoted_identifier on
set arithabort off
set numeric_roundabort off
set ansi_warnings on
set ansi_padding on
set ansi_nulls on
set concat_null_yields_null on
set cursor_close_on_commit off
set implicit_transactions off
set language us_english
set dateformat mdy
set datefirst 7
set transaction isolation level read committed

然后SQL:BatchStarting

USE [TransactionScopeTests]; DELETE FROM T3; DELETE FROM T1;

然后是Audit Logout，然后是RPC:Completed

exec sp_reset_connection

查看表格，T3为空，T1不是。

但是，如果我们将代码包装在TransactionScope中：

using (var transactionScope = new TransactionScope())
{
    using (var sqlConnection = new SqlConnection(ConnectionString))
    {
        sqlConnection.Open();

        using (SqlCommand sqlCommand = sqlConnection.CreateCommand())
        {
            sqlCommand.CommandText = "USE [TransactionScopeTests]; DELETE FROM T3; DELETE FROM T1;";

            sqlCommand.ExecuteNonQuery();
        }

        transactionScope.Complete();
    }
}

这将导致正确的行为。关闭连接后，将回滚事务。

然而，困扰我的是在分析正在发送的SQL时我看不到这种行为。我期待用BEGIN TRAN或SET XACT_ABORT ON或类似的东西打开连接，但我看不出差异（我确实将输出保存到文本文件并将它们与difftool进行比较，他们＆＃ 39;与信相同。）

这是探查器的输出：

Audit Login：

-- network protocol: Named Pipes
set quoted_identifier on
set arithabort off
set numeric_roundabort off
set ansi_warnings on
set ansi_padding on
set ansi_nulls on
set concat_null_yields_null on
set cursor_close_on_commit off
set implicit_transactions off
set language us_english
set dateformat mdy
set datefirst 7
set transaction isolation level read committed

然后SQL:BatchStarting

USE [TransactionScopeTests]; DELETE FROM T3; DELETE FROM T1;

然后审核Logout，然后是RPC:Completed

exec sp_reset_connection

但是，在这种情况下，T3会恢复原状，因为整个语句都失败了。

有人可以详细说明.NET如何确保代码在事务中执行吗？

Answer 1

尝试将您的查询更改为：

SELECT @@OPTIONS USE [TransactionScopeTests]; DELETE FROM T3; DELETE FROM T1;

您应该在会话级别看到不同的选项，因为这是事务范围的变化。试一试，选项应该不同！

TransactionScope和回滚

1 个答案: