Question

我们正在尝试将Microsoft Sync Framework实现到我们的应用程序中，该应用程序使用NHibernate持久保存它的域。

我们遇到的一个问题是，在Sync Framework更改了您的初始数据库结构（添加影子表和触发器）之后，当您尝试将对象插入数据库时，NHibernate似乎会因为抛出toomanyrowsaffectedexception而感到不安。

我发现这篇文章的解决方案是在每个更新语句周围添加SET NOCOUNT ON和OFF，但由于表结构由nhibernate自动生成，同步触发器由Sync Framework自动生成，因此手动调整所有触发器真是一个选择。

http://www.codewrecks.com/blog/index.php/2009/03/25/nhibernate-and-toomanyrowsaffectedexception/

我尝试按照此问题中的说明设置sql server 2008属性NOCOUNT：Where's the best place to SET NOCOUNT? 但是这导致了StaleStateException（受影响的行数为-1，预期为1）。

您是否知道是否有办法配置同步框架以在其触发器中自动设置这些NOCOUNT语句？或者有没有办法告诉NHibernate期望更多/更少的行被更改？或者也许你们中的任何人都有一个自动脚本来将这些NOCOUNT语句添加到同步框架的触发器中。

提前谢谢！

Answer 1

我认为NOCOUNT方式是要走的路。您可以通过为同步框架使用的所有表设置NOCOUNT来执行此操作。请参阅下面的代码。另一种方法是修补NHibernate并忽略updatecount参见（https://nhibernate.jira.com/browse/NH-1353）。

KR，

保

    class SqlSyncTriggerHelper
{
    private const string triggerSql = @"select sys.triggers.name from sys.triggers, sys.objects
        where sys.objects.name='{0}' and sys.objects.type = 'U' and sys.triggers.parent_id = sys.objects.object_id";

    private DbSyncScopeDescription syncScopeDescription;

    public SqlSyncTriggerHelper(DbSyncScopeDescription syncScopeDescription)
    {
        this.syncScopeDescription = syncScopeDescription;
    }

    public void Apply(SqlConnection conn)
    {
        SqlTransaction transaction = null;
        try
        {
            if (conn.State == System.Data.ConnectionState.Closed)
            {
                conn.Open();
            }
            transaction = conn.BeginTransaction();
            foreach (var table in syncScopeDescription.Tables)
            {
                foreach (string trigger in GetTriggers(table.UnquotedLocalName, conn, transaction))
                {
                    AlterTrigger(trigger, conn, transaction);
                }
            }
            transaction.Commit();
        }
        catch
        {
            if (transaction != null)
            {
                transaction.Rollback();
            }
            throw;
        }
        finally
        {
            if (transaction != null)
            {
                transaction.Dispose();
            }
            conn.Close();
        }
    }

    private void AlterTrigger(string trigger, SqlConnection conn, SqlTransaction transaction)
    {
        SqlCommand newCmd = new SqlCommand(string.Format("exec sp_helptext '{0}'", trigger), conn, transaction);
        var triggerStringBuilder = new StringBuilder();
        using (var reader = newCmd.ExecuteReader())
        {
            while (reader.Read())
            {
                triggerStringBuilder.Append(reader.GetValue(0) as string);
            }
        }
        var triggerString = triggerStringBuilder.ToString();
        triggerString = triggerString.Replace("CREATE TRIGGER", "ALTER TRIGGER").Replace(" AS\n", " AS\nSET NOCOUNT ON\n") + "\nSET NOCOUNT OFF";
        var alterTriggerCommand = new SqlCommand(triggerString, conn, transaction);
        alterTriggerCommand.ExecuteNonQuery();
    }

    private IEnumerable<string> GetTriggers(string tableName, SqlConnection conn, SqlTransaction transaction)
    {
        var resultList = new List<string>();
        var command = new SqlCommand(string.Format(triggerSql, tableName), conn, transaction);
        using (var reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                resultList.Add(reader.GetString(0));
            }
        }
        return resultList;
    }
}

Microsoft Sync Framework与Nhibernate TooManyRowsAffectedexception冲突

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