DWORD CTextildb::Open()
{
SetCursor(LoadCursor(NULL,IDC_WAIT));
DWORD dr;
DWORD rc;
HRESULT hr;
IDataInitialize * pIDataInitialize = NULL;
IDBInitialize * pIDBInitialize = NULL;
IDBCreateSession* pIDBCreateSession = NULL;
IUnknown * pUnkSession = NULL;
ICommandText* pICommandText = NULL;
IDBCreateCommand* pICreateCommand = NULL;
char cConnectionStr[500];
strcpy(cConnectionStr,"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=bd1.mdb;Persist Security Info=False");
db_CharToWChar(cConnectionStr);
for(;;)
{
dr = ERR_OLEDBFAIL;
hr = CoCreateInstance(CLSID_MSDAINITIALIZE,NULL,CLSCTX_INPROC_SERVER,IID_IDataInitialize,(VOID **)&pIDataInitialize);
if (hr != S_OK) break;
hr = pIDataInitialize->GetDataSource(NULL,CLSCTX_INPROC_SERVER,(LPCOLESTR)cConnectionStr,IID_IDBInitialize,(IUnknown **)&pIDBInitialize);
if (hr != S_OK) break;
hr = pIDBInitialize->Initialize();
if (hr != S_OK) break;
hr = pIDBInitialize->QueryInterface(IID_IDBCreateSession, (void**)&pIDBCreateSession);
if (hr != S_OK) break;
hr = pIDBCreateSession->CreateSession(NULL,IID_IOpenRowset,&pUnkSession );
if (hr != S_OK) break;
hr = pUnkSession->QueryInterface(IID_IDBCreateCommand,(void**)&pICreateCommand);
if (hr != S_OK) break;
hr = pICreateCommand->CreateCommand(NULL,IID_ICommand,(IUnknown**)&m_lpICommand);
if (hr != S_OK) break;
dr = ERR_NONE;
break;
};
if (pIDataInitialize) rc = pIDataInitialize->Release();
if (pIDBInitialize) rc = pIDBInitialize->Release();
if (pIDBCreateSession) rc = pIDBCreateSession->Release();
if (pUnkSession) rc = pUnkSession->Release();
if (pICreateCommand) rc = pICreateCommand->Release();
if (hr != S_OK)
{
if (m_lpICommand) rc = m_lpICommand->Release();
m_lpICommand = NULL;
}
SetCursor(LoadCursor(NULL,IDC_ARROW));
return ERR_OLEDBFAIL;
}
/////////////////////////////////////////////////////////////////
// HRESULT CRow::CreateCommand
//
/////////////////////////////////////////////////////////////////
HRESULT CRow::CreateCommand(CAggregate* pCAggregate, REFIID riid, IUnknown** ppIUnknown)
{
HRESULT hr = S_OK;
//Obtain the IDBCreateCommand Interface
IDBCreateCommand* pIDBCreateCommand = SOURCE_GETINTERFACE(this, IDBCreateCommand);
if(pIDBCreateCommand)
{
//CreateCommand
XTEST(hr = pIDBCreateCommand->CreateCommand(pCAggregate, riid, ppIUnknown));
TESTC(TRACE_METHOD(hr, L"IDBCreateCommand::CreateCommand(0x%p, %s, &0x%p)", pCAggregate, GetInterfaceName(riid), ppIUnknown ? *ppIUnknown : NULL));
//Handle Aggregation
if(pCAggregate)
TESTC(hr = pCAggregate->HandleAggregation(riid, ppIUnknown));
}
CLEANUP:
return hr;
}
ICommandText* CClientDB::CreateCommand( IDBInitialize* pIDBInitialize ,LPCWSTR wCmdString )
{
IDBCreateSession* pIDBCreateSession = NULL;
IDBCreateCommand* pIDBCreateCommand = NULL;
ICommandText* pICommandText = NULL;
if( pIDBInitialize == NULL || wCmdString == NULL )
{
return NULL;
}
//Create a new activity from the data source object.
if(FAILED(pIDBInitialize->QueryInterface( IID_IDBCreateSession, (void**) &pIDBCreateSession)))
{
return NULL;
}
if(FAILED(pIDBCreateSession->CreateSession( NULL, IID_IDBCreateCommand, (IUnknown**) &pIDBCreateCommand)))
{
return NULL;
}
pIDBCreateSession->Release();
//Create a Command object.
if(FAILED(pIDBCreateCommand->CreateCommand( NULL, IID_ICommandText, (IUnknown**) &pICommandText)))
{
pIDBCreateCommand->Release();
return NULL;
}
pIDBCreateCommand->Release();
//Set the command text.
if(FAILED(pICommandText->SetCommandText(DBGUID_DBSQL, wCmdString )))
{
pICommandText->Release();
return NULL;
}
return pICommandText;
}
/********************************************************************
SqlSessionExecuteQuery - executes a query and returns the results if desired
NOTE: ppirs and pcRoes and pbstrErrorDescription are optional
********************************************************************/
extern "C" HRESULT DAPI SqlSessionExecuteQuery(
__in IDBCreateSession* pidbSession,
__in __sql_command LPCWSTR wzSql,
__out_opt IRowset** ppirs,
__out_opt DBROWCOUNT* pcRows,
__out_opt BSTR* pbstrErrorDescription
)
{
Assert(pidbSession);
HRESULT hr = S_OK;
IDBCreateCommand* pidbCommand = NULL;
ICommandText* picmdText = NULL;
ICommand* picmd = NULL;
DBROWCOUNT cRows = 0;
if (pcRows)
{
*pcRows = NULL;
}
//
// create the command
//
hr = pidbSession->CreateSession(NULL, IID_IDBCreateCommand, (IUnknown**)&pidbCommand);
ExitOnFailure(hr, "failed to create database session");
hr = pidbCommand->CreateCommand(NULL, IID_ICommand, (IUnknown**)&picmd);
ExitOnFailure(hr, "failed to create command to execute session");
//
// set the sql text into the command
//
hr = picmd->QueryInterface(IID_ICommandText, (LPVOID*)&picmdText);
ExitOnFailure(hr, "failed to get command text object for command");
hr = picmdText->SetCommandText(DBGUID_DEFAULT , wzSql);
ExitOnFailure1(hr, "failed to set SQL string: %ls", wzSql);
//
// execute the command
//
hr = picmd->Execute(NULL, (ppirs) ? IID_IRowset : IID_NULL, NULL, &cRows, reinterpret_cast<IUnknown**>(ppirs));
ExitOnFailure1(hr, "failed to execute SQL string: %ls", wzSql);
if (DB_S_ERRORSOCCURRED == hr)
{
hr = E_FAIL;
}
if (pcRows)
{
*pcRows = cRows;
}
LExit:
if (FAILED(hr) && picmd && pbstrErrorDescription)
{
HRESULT hrGetErrors = SqlGetErrorInfo(picmd, IID_ICommandText, 0x409, NULL, pbstrErrorDescription); // TODO: use current locale instead of always American-English
if (FAILED(hrGetErrors))
{
ReleaseBSTR(*pbstrErrorDescription);
}
}
ReleaseObject(picmd);
ReleaseObject(picmdText);
ReleaseObject(pidbCommand);
return hr;
}
