Question

我正在尝试将记录从一个SQL Server表复制到另一个SQL Server表。两个表都具有相同的结构，其中一列是xml类型。源表中包含大量xml内容，大约2.5Mb。

我将xml列的内容保存到文件中，请参阅附带的map.zip或从中下载 https://docs.google.com/leaf?id=0Bz4PXXEQL5TpM2U5MWJhM2MtMTI0Yi00ODg0LTk4OWItMzJiNjVjMDIzNjc2&hl=en&authkey=CLT5i8oP

我的代码的简化版本：

string query = "select * from MyTableSource where id = 1";

using (SqlConnection targetConnection = new SqlConnection(connectionStringTarget))
{
targetConnection.Open();

using (SqlConnection sourceConnection = new SqlConnection(connectionStringSource))
{
    sourceConnection.Open();

    using (SqlCommand command = new SqlCommand(query, sourceConnection))
    {
    using (IDataReader reader = command.ExecuteReader(CommandBehavior.SingleResult))
    {
        using (SqlBulkCopy bulkCopy = new SqlBulkCopy(targetConnection))
        {
        bulkCopy.DestinationTableName = "MyTableTarget";
        bulkCopy.WriteToServer(reader);
        }
    }
    }
} 
}

bulkCopy.WriteToServer上发生异常：

System.Data.SqlClient.SqlException was unhandled
Message=XML parsing: Document parsing required too much memory
Source=.Net SqlClient Data Provider
ErrorCode=-2146232060
Class=16
LineNumber=1
Number=6303
Procedure=""
Server=myserver
State=1
StackTrace:
     at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
     at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
     at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
     at System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal()
     at System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount)
     at System.Data.SqlClient.SqlBulkCopy.WriteToServer(IDataReader reader)
     at SyncTest.Form1.buttonCopyXml_Click(Object sender, EventArgs e) in C:\..\Form1.cs:line 2251
     at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
     at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
     at System.Windows.Forms.Control.WndProc(Message& m)
     at System.Windows.Forms.ButtonBase.WndProc(Message& m)
     at System.Windows.Forms.Button.WndProc(Message& m)
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
     at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
     at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
     at SyncTest.Program.Main() in C:\..\Program.cs:line 18
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Threading.ThreadHelper.ThreadStart()
InnerException:

它看起来像是一个SqlBulkCopy错误。我想知道其他人是否可以复制并确认。

更新归档给微软，

_HTTPS：//connect.microsoft.com/VisualStudio/feedback/details/614046/sqlbulkcopy-fails-trying-to-copy-a-row-with-large-content-in-an-xml-column

他们证实这是他们的错误：

从调试到目前为止，看起来像批量复制路径中的服务器端处理XML的问题。 XML文件中的一个属性非常大，这导致SQL Server在处理XML时由于分配大小限制而失败。

Answer 1

更改您的选择查询以将xml列检索为[n] varchar（max）列类型，以避免xml处理开销，也可能是错误。

SqlBulkCopy无法尝试在XML列中复制具有大内容的行

1 个答案: