ADO
From: Pardeep Kadian (anonymous_at_discussions.microsoft.com)
Date: 02/26/04
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Date: Thu, 26 Feb 2004 05:26:05 -0800
Dear ,
I m in Urgent Need of Your Guidence.
I m writing an very simple Code to access SqlServer using SQLOLEDB Provider
And Every Thing is here , even if you have to try The same code , just replace
Data Source and "Initial Catalog" Values in Connection String
The problem is it is showing Successfull execution of Open(....) , for Connection as well as Recordset, but when i m tring to access records it throws an error which is
/*************************
Error
Code = 800a0e78
Code meaning = Unknown error 0x800A0E78
Source = ADODB.Recordset
Description = Operation is not allowed when the object is closed.
************************************************************************************************/
Can anyOne Plz Let Me know the issue.
Thanx & Regards,
Pardeep Kadian
here it is
// BeginOpenCpp
#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile")
#include <oledb.h>
#include <stdio.h>
#include <conio.h>
// Function declarations
inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);};
void OpenX(void);
void PrintProviderError(_ConnectionPtr pConnection);
void PrintComError(_com_error &e);
///////////////////////////////////////////////////////////
// //
// OpenX Function //
// //
///////////////////////////////////////////////////////////
void OpenX(void)
{
// Define ADO object pointers.
// Initialize pointers on define.
// These are in the ADODB:: namespace
_RecordsetPtr pRstEmployee = NULL;
_ConnectionPtr pConnection = NULL;
// Define string variables.
_bstr_t strCnn("Provider=SQLOLEDB.1;Password=test;Persist Security Info=True;User ID=test;Initial Catalog=test;Data Source=EXCHANGE");
_bstr_t szValue;
_variant_t nVtIndex;
nVtIndex.vt= VT_I2 ;
// Define Other Variables.
HRESULT hr = S_OK;
DBDATE varDate;
try
{
// open connection and record set
TESTHR(pConnection.CreateInstance(__uuidof(Connection)));
HRESULT hr = pConnection->Open(strCnn,"","",adConnectUnspecified);
TESTHR(pRstEmployee.CreateInstance(__uuidof(Recordset)));
hr = pRstEmployee->Open("Select * from PardeepDummy",
_variant_t((IDispatch *)pConnection,true), adOpenForwardOnly,
adLockReadOnly, adAsyncExecute);
while(!pRstEmployee->EndOfFile)
{
nVtIndex.iVal = 1;
//mbstowcs
szValue=pRstEmployee->Fields->GetItem(nVtIndex)->Value;
// CString szValuestr((char *)szValue);
pRstEmployee->MoveNext();
}
// Clean up objects before exit.
pRstEmployee->Close();
pConnection->Close();
}
catch(_com_error &e)
{
// Notify the user of errors if any.
// Pass a connection pointer accessed from the Connection.
PrintProviderError(pConnection);
PrintComError(e);
}
}
///////////////////////////////////////////////////////////
// //
// PrintProviderError Function //
// //
///////////////////////////////////////////////////////////
void PrintProviderError(_ConnectionPtr pConnection)
{
// Print Provider Errors from Connection object.
// pErr is a record object in the Connection's Error collection.
ErrorPtr pErr = NULL;
if( (pConnection->Errors->Count) > 0)
{
long nCount = pConnection->Errors->Count;
// Collection ranges from 0 to nCount -1.
for(long i = 0;i < nCount;i++)
{
pErr = pConnection->Errors->GetItem(i);
printf("\t Error number: %x\t%s", pErr->Number,
pErr->Description);
}
}
}
///////////////////////////////////////////////////////////
// //
// PrintComError Function //
// //
///////////////////////////////////////////////////////////
void PrintComError(_com_error &e)
{
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());
// Print COM errors.
printf("Error\n");
printf("\tCode = %08lx\n", e.Error());
printf("\tCode meaning = %s\n", e.ErrorMessage());
printf("\tSource = %s\n", (LPCSTR) bstrSource);
printf("\tDescription = %s\n", (LPCSTR) bstrDescription);
}
// EndOpenCpp
///////////////////////////////////////////////////////////
// //
// Main Function //
// //
///////////////////////////////////////////////////////////
void main()
{
if(FAILED(::CoInitialize(NULL)))
return;
OpenX();
::CoUninitialize();
getch();
}
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