Client/server ODBC Problem

Nov 6, 2004

I have an application on:

W2K client
Sql 2000 + No SP
MS ODBC V3.8
C++

The application, running on the client, connects to SQL server for many simultaneous queries involving select, insert and update. Application creats a thread for each query. Each thread connects to the sql server via ODBC using sqlconnect.

However I find that the individual thread do not close properly and stay open even after sqldisconnect has been issued on the client. At one point I have over 1200 threads on client application trying simultaneously to connect to the server and the sqlserver is holding with 276 threads open.

I do not understand why the ODBC connection stays open even after sqldisconnect is issued. I have even tried disabling connection pooling, to no effect. The performance is very poor.

How can I issue a large number of queries to same sql server via ODBC while guaranteeing performance?

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I apologize if this is not the correct forum for this posting. Looking at the descriptions, it appeared to be the best choice.

I am running Windows XP Pro SP2. I have installed the SQL Native Client for
XP. However, when I try to add a new data source through ODBC Connection
Manager, SQL Native Client is not listed as an option. I have followed this procedure on three other systems with no problems. What would be causing the
SQL Native Client to not show up in the list of available ODBC data sources?

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Newbie here,

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I have tried to create a dsn to the sql server but i cannot connect. I can ping the sbs server through the command interface but the error i get when i try to connect is :

Connection failed:
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Sep 13, 2007



Hi,



When I'm using SQL server 2005, and ODBC drive €œSQL Native Client€? I get an error when executing the below given code. Error Message: €œTransaction cannot start because more than one ODBC connection is in use.€?



But this works well with SQL Server 2000 with ODBC drive "SQL Native Client" and in SQL server 2005 also when I used ODBC drive €œSQL Server€?.



I used aTrgConn.Execute(€œBegin Transaction€?) and it's working properly. But unfortunately I cannot use this method, because I want to run the same code with Oracle ODBC as well.
Is this a known issue in SQL Native client drive with SQL server 2005? Do you know a solution for this?


Please Help..............



Thanks in advance.




Code:

Dim aTrgConn As New ADODB.connection
Dim aCmdIns As New ADODB.Command
Dim aCmdUpd As New ADODB.Command



aTrgConn.Open sConnStr



Set aCmdIns.ActiveConnection = aTrgConn
Set aCmdUpd.ActiveConnection = aTrgConn

aTrgConn.BeginTrans

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Hi All,

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I would now like to install my application on another workstation and connect remotely to the database located on my development machine.

The client workstation does not have SQL Server 2005 Express installed on it because I would just like my application to connect remotely by creating the DSN and using ODBC. What I'm missing here are the database drivers. The "SQL Natice Client" is not available on this client workstation. How can I deploy the necessary drivers with my installation file so that I may create the required DSN name using the SQL Native Client driver?

Thanks!

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I created very simple table with 3 columns and one is varchar(max) datatype

When i insert records thru VC++ ADO code i am getting this error



Exception Description Multiple-step OLE DB operation generated errors. Check e
ach OLE DB status value, if available. No work was done. and Error Number:: -2147217887



ODBC Driver: SQL Native Client

SQL server 2005



Table

CREATE TABLE [dbo].[RAVI_TEMP](

[ID] [int] NULL,

[Name] [varchar](max) NULL,

[CITY] [varchar](50) NULL

)



VC++ code

#include "stdafx.h"
#include <string>
#include <strstream>
#include <iomanip>


int main(int argc, char* argv[])
{
try
{
HRESULT hr = CoInitialize(NULL);
_RecordsetPtr pExtRst = NULL;
_bstr_t bstrtDSN, bstrtSQL;
bstrtDSN = L"DSN=espinfo;UID=opsuser;PWD=opsuser;";
bstrtSQL = L"SELECT * FROM RAVI_TEMP";

_variant_t vartValueID,vartValueNAME,vartValueCITY;
_bstr_t bstrtValueID,bstrtValueNAME,bstrtValueCITY;

pExtRst.CreateInstance(__uuidof(Recordset));
hr = pExtRst->Open(bstrtSQL, bstrtDSN, adOpenDynamic, adLockOptimistic, adCmdText);

hr = pExtRst->AddNew();

bstrtValueID = L"1";
vartValueID = bstrtValueID.copy();

bstrtValueNAME = L"RAVIBABUBANDARU";
vartValueNAME = bstrtValueNAME.copy();

bstrtValueCITY = L"Santa Clara";
vartValueCITY = bstrtValueCITY.copy();

pExtRst->GetFields()->GetItem(L"ID")->Value = vartValueID;
pExtRst->GetFields()->GetItem(L"NAME")->Value = vartValueNAME;
pExtRst->GetFields()->GetItem(L"CITY")->Value = vartValueCITY;
pExtRst->Update();
pExtRst->Close();

}
catch(_com_error e)
{
printf("Exception Description %s and Error Number:: %d",(LPTSTR)e.Description(),e.Error());
return e.Error();
}
return 0;
CoUninitialize();
}


if i use regular SQL ODBC driver, no error but its truncating the data



Adv Thanks for your help

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Hi,
I am not sure if I select right Froum:)
It might be a basic question but could you please help me on that?



Working Environment:



I have developed application on SQL Server 2005 and now wants to Run on Client Site, I am using access as a front end and SQL server 2005 back end through ODBC (System Dsn) which is working good. (user has been added on SQL Server and on Database)



Question:

1) Do I need to create new System Dsn Or other DSN (Keep in mind I have already create System DSN in Server) at each client site to access application from Server?

(If yes then I am trying to do that, it allow me to create (with required database which is on Server) and verify but doesn’t save on ODBC list so I can’t use that name to run appliation on client site)



I am using windows authentication.



Thanks for help in advance



AA

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Jun 7, 2007

Hi,


It might be a basic question but could you please help me on that?

Working Environment:

I have developed application on SQL Server 2005 and now wants to Run on Client Site, I am using access as a front end and SQL server 2005 back end through ODBC (System Dsn) which is working good. (user has been added on SQL Server and on Database)

Question:
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(If yes then I am trying to do that, it allow me to create (with required database which is on Server) and verify but doesn€™t save on ODBC list so I can€™t use that name to run appliation on client site)

I am using windows authentication.

Thanks for help in advance





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select
{ fn convert(N'1.23', SQL_DOUBLE) }

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Apr 16, 2008

The following (VB.Net) code causes exceptions at seemingly random times.
Any suggestions?
Not sure if the problem is in .Net's ODBC support or in Sql Native Client.

If MARS is off, usually after less than 100 loops:



Code Snippet

System.Data.Odbc.OdbcException was unhandled
ErrorCode=-2146232009
Message="ERROR [HY000] [Microsoft][SQL Native Client]Connection is busy with results for another command"
Source="SQLNCLI.DLL"
Turning MARS is on bypasses that error, so it will sometimes survive a thousand or so runs before hitting:




Code Snippet

System.Data.Odbc.OdbcException was unhandled
ErrorCode=-2146232009
Message="ERROR [23000] [Microsoft][SQL Native Client][SQL Server]Cannot insert the value NULL into column 'Number', table 'tempdb.dbo.#TempTable___..(shortened to fit).. _________000000002F3F'; column does not allow nulls. INSERT fails.
Source="SQLNCLI.DLL"
Code here:
(Console Application, empty database,
Visual Studio 2005, .Net 2.0, Windows XP,SQL Server 2005 or SQL Express 2005, Local or Remote)





Code Snippet

Module Module1

Sub Main()

'Dim connection As New SqlClient.SqlConnection("database=TestDB;server=.sqlexpress;Integrated Security=SSPI;") 'Doesn't crash
'Dim connection As New OleDb.OleDbConnection("Provider=SQLNCLI;database=TestDB;Server=.sqlexpress;Trusted_Connection=yes;") 'Doesn't crash

'Dim connection As New Odbc.OdbcConnection("Driver={SQL Native Client};Database=TestDB;Server=.sqlexpress;Trusted_Connection=yes;") 'Crashes
Dim connection As New Odbc.OdbcConnection("Driver={SQL Native Client};Database=TestDB;Server=.sqlexpress;Trusted_Connection=yes;MARS_Connection=yes") 'Crashes

VBMath.Randomize()

Dim run_count As Integer = 1
connection.Open()
Console.WriteLine("Connected!!")

While True
'connection.Open()

Dim testcmd As New Odbc.OdbcCommand("CREATE TABLE [#TempTable] (Number int PRIMARY KEY)", connection)
testcmd.ExecuteNonQuery()
testcmd.Dispose()
testcmd = Nothing

Dim dtTemp As New DataTable
Dim daTemp As New Odbc.OdbcDataAdapter("SELECT * FROM [#TempTable]", connection)
daTemp.MissingSchemaAction = MissingSchemaAction.AddWithKey
daTemp.Fill(dtTemp)
Dim cbTemp As New Odbc.OdbcCommandBuilder(daTemp)
Dim viewTemp As New DataView(dtTemp, Nothing, "Number", DataViewRowState.CurrentRows)

Dim i As Integer
For i = 1 To 1000
Dim test_number As Integer = CInt(Rnd() * 2000)
If viewTemp.Find(test_number) = -1 Then 'Keep it unique
Dim new_temp_row As DataRowView = viewTemp.AddNew()
new_temp_row("Number") = test_number
new_temp_row.EndEdit()
End If
Next

daTemp.Update(dtTemp)

'daTemp.Dispose()
'daTemp = Nothing

'cbTemp.Dispose()
'cbTemp = Nothing

'dtTemp.Dispose()
'dtTemp = Nothing

'viewTemp.Dispose()
'viewTemp = Nothing


Dim testcmd2 As New Odbc.OdbcCommand("DROP TABLE [#TempTable]", connection)
testcmd2.ExecuteNonQuery()
testcmd2.Dispose()
testcmd2 = Nothing

'connection.Close()
'GC.Collect()

'Console.Write(".")
run_count += 1
End While

End Sub

End Module

Usually the ".Update" triggers the exception, but sometimes the other sql commands do it.
Have tried various experiments with disposing of objects immediately when finished, but no effect.
Opening and closing the connection each loop seems to delay the errors, but it still happens eventually.

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The ODBC DSN used by the Maccola client shows a checkbox for the 'select a failover server' but the checkbox is grayed out.

Also the summary of settings for the DSN at the end of the wizard reveals that the failover to server (y/N) option is set to N.

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Another suspicious item is that the DSN cannot connect to the server with SA permissions, even though the server is set to mixed security and we use the correct authentication.

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Hi Everybody,


On localhost this application works fine but when I put on remote server. I am getting following errors. For both localhost and server, I am using same remote sql 2000. I will appreciate any help.

Thanks,

Arif



Server Error in '/' Application.
--------------------------------------------------------------------------------

ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near ')'.
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: Microsoft.Data.Odbc.OdbcException: ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near ')'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[OdbcException: ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near ')'.]
Microsoft.Data.Odbc.OdbcConnection.HandleError(IntPtr hHandle, SQL_HANDLE hType, RETCODE retcode) +27
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Microsoft.Data.Odbc.OdbcCommand.ExecuteNonQuery() +80
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System.Web.UI.Control.OnLoad(EventArgs e) +67
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When i open SSIS 2014 and tried to create the odbc connection but i can able to see only the 32 bit system DSN connection ,i can't able to see my 64 bit odbc system dsn connection.

Microsoft Visual Studio 2012 Shell (Integrated)
Version 11.0.50727.1 RTMREL
Microsoft .NET Framework
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SQL Server Integration Services   
Microsoft SQL Server Integration Services Designer
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And i installed my client odbc drivers(32,64 bit) and created ODBC system DSNs in my local system and when i open ssis 2014 and i can able to see both the ODBC system DSNS(32,64) connections from SSIS ODBC connection.

I am using below version of .net framework in my local system which was installed in windows 7 and i have SSIS 2012 also installed in my system and i can able to see both ODBC connections using 2012 as well in my local system.

Microsoft Visual Studio 2012 Shell (Integrated)
Version 11.0.50727.1 RTMREL
Microsoft .NET Framework
Version 4.5.50938

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I have tried this on several different operating systems (VISTA and XP ) and several versions of SQL NATIVE CLIENT including 2005.90.3042.0

I have a 64 bit "SQL NATIVE CLIENT" connection that fails. The exact same connection and code succeeds on 32 bit.
My customer and I prepend "oledb:" to the connection string and it starts working.

FAILS on 64 bit:
Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False

WORKS
oledb:Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Wrigley_Test;Data Source=MONGO;Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=RIPTIDE;Use Encryption for Data=False;Tag with column collation when possible=False;MARS Connection=False;DataTypeCompatibility=0;Trust Server Certificate=False

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