SqlBulkCopy Computed Column Error.

Feb 27, 2008



Hi,
Iam using SqlBulkCopy to copy data of all the tables from one database to another database. SqlBulkCopy runs just fine but it throws exception for one of the tables which is having computed column.

snnipet of code is


For Cnt = 0 To oDS.Tables(0).Rows.Count - 1

oSqlCmd2 = New SqlCommand

oSqlCmd2.Connection = oConn

oSqlCmd2.CommandText = "select * from " & "" & oDS.Tables(0).Rows(Cnt).Item(0).ToString & " "

'Dim reader As SqlDataReader

oDS2 = New DataSet

oDA2 = New SqlDataAdapter

oDA2.SelectCommand = oSqlCmd2

'reader = oSqlCmd2.ExecuteReader

oDA2.Fill(oDS2, "test")

Dim bulkData As SqlBulkCopy = New SqlBulkCopy(oConn2)



'Get the data from the second database and fill the dataset

oDA2 = New SqlDataAdapter

bulkData.DestinationTableName = "" & oDS.Tables(0).Rows(Cnt).Item(0).ToString & " "

bulkData.BatchSize = 1000

bulkData.BulkCopyTimeout = 2000

bulkData.WriteToServer(oDS2.Tables(0))

oDS2.Dispose()

oSqlCmd2.Dispose()

Next
For one of the tables iam getting the following error
The column "Col4" cannot be modified because it is either a computed column or is the result of a UNION operator

Since iam fetching table names at runtime its not possible to use columnMappings.

So, how to come out of this situation.
TIA


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I have encountered a very frustrating situation when trying to use SQLBulkCopy. I have two excel files that I am trying to import into two tables in an MSSQL Server 2005 Express DB. One excel file has 5,000 rows, while the other file has 500,000 rows.I was able to import the smaller file successfully using this vb.net code:  Protected Sub L26ExcelToSQL() 'Declare Variables
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A
transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)



Description: An
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException:
A transport-level error has occurred when receiving results from the
server. (provider: TCP Provider, error: 0 - The specified network name
is no longer available.)

Source Error:




Line 438:Line 439: bulkCopy.DestinationTableName = sSQLTableLine 440: bulkCopy.WriteToServer(dr)Line 441:Line 442: OleDbConn.Close()







Source File: d:hostingmemberwolsite1L26DuesDefault2.aspx.vb    Line: 440


Stack Trace:




[SqlException (0x80131904): A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)] System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +925466 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800118 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186 System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error) +556 System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj) +164 System.Data.SqlClient.TdsParserStateObject.ReadPacket(Int32 bytesExpected) +34 System.Data.SqlClient.TdsParserStateObject.ReadBuffer() +44 System.Data.SqlClient.TdsParserStateObject.ReadByte() +17 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +79 System.Data.SqlClient.SqlBulkCopy.WriteToServerInternal() +1336 System.Data.SqlClient.SqlBulkCopy.WriteRowSourceToServer(Int32 columnCount) +916 System.Data.SqlClient.SqlBulkCopy.WriteToServer(IDataReader reader) +151 _Default.CSVToSQL() in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:440 _Default.ButtonTest3_Click(Object sender, EventArgs e) in d:hostingmemberwolsite1L26DuesDefault2.aspx.vb:905 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746









Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433 After I received this error message, I tried viewing my database through the MSSQL Control Panel utilized by my hosting provider (WebHost4Life). However, I was unable to connect to the database and received this error: ___________________Microsoft OLE DB Provider for SQL Server error '80040e14' Database 1496 cannot be autostarted during server shutdown or startup. /getDBinfo.asp, line 29

_____________________ Now here is the most frustrating/mysterious part. I figured that maybe the error message were a result of the large size of the second excel file, so just for testing purposes, I created a new table in my MSSQL database. The table just has two fields, both set to varchar(50). I then created a test excel file, that had one row with the word "test" in the first and second column. When I tried using the code above to import the test excel data into the test table, I got the same exact error as I did with the 500,000 row file!Please help, I'm really stumped and I am not sure when I am having so much trouble replicating the success I had the 5,000 row file. Any suggestions are much apprecaited. -Bryan  

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Stored Procedure
================================================== ==============
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================================================== ==============
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Hello everybody!

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Code Snippet
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SET ANSI_WARNINGS ON
SET ARITHABORT ON
SET CONCAT_NULL_YIELDS_NULL ON
SET NUMERIC_ROUNDABORT OFF
SET QUOTED_IDENTIFIER ON
GO
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GO
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GO
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-- Clustered index scan with two times Compute Scalar
GO
select * from t2 -- (2)
-- Clustered index scan with one times Compute Scalar
GO
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GO
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GO
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GO
drop table t1
GO
drop table t2
GO
SET ANSI_PADDING OFF



1. I don't understand why access to computed column raise scalar computation wto times?
2. I don't understand why access to persisted computed column raise any scalar computation?
3. I don't understand why access to persisted computed column over index required any scalar computations?

Can anyone from Microsoft SQL Server Team told me about this mistake?
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--
Thanks with avanced.
WBR, Roman S. Golubin
grominc[at]gmail.com

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