ADO 超强大数据库操作类（附例程）

************************************Ado2.cpp********************************************* // // MODULE: Ado2.cpp // // AUTHOR: Carlos Antollini // // Copyright (c) 2001-2004. All Rights Reserved. // // Date: August 01, 2005 // // Version 2.20 // // This code may be used in compiled form in any way you desire. This // file may be redistributed unmodified by any means PROVIDING it is // not sold for profit without the authors written consent, and // providing that this notice and the authors name and all copyright // notices remains intact. // // An email letting me know how you are using it would be nice as well. // // This file is provided "as is" with no expressed or implied warranty. // The author accepts no liability for any damage/loss of business that // this product may cause. // // ////////////////////////////////////////////////////////////////////// #include "ado2.h" #define ChunkSize 100 /////////////////////////////////////////////////////// // // CJetEngine Class // BOOL CJetEngine::CompactDatabase(CString strDatabaseSource, CString strDatabaseDestination) { try { ::CoInitialize(NULL); IJetEnginePtr jet(__uuidof(JetEngine)); HRESULT hr = jet->CompactDatabase(_bstr_t(strDatabaseSource.GetBuffer(0)), _bstr_t(strDatabaseDestination.GetBuffer(0))); jet.Release(); ::CoUninitialize(); return hr == S_OK; } catch(_com_error) { ::CoUninitialize(); return FALSE; } } BOOL CJetEngine::RefreshCache(ADODB::_Connection *pconn) { //Added by doodle@email.it try { ::CoInitialize(NULL); IJetEnginePtr jet(__uuidof(JetEngine)); HRESULT hr = jet->RefreshCache(pconn); ::CoUninitialize(); return hr == S_OK; } catch(_com_error) { ::CoUninitialize(); return FALSE; } return FALSE; } /////////////////////////////////////////////////////// // // CADODatabase Class // DWORD CADODatabase::GetRecordCount(_RecordsetPtr m_pRs) { DWORD numRows = 0; numRows = m_pRs->GetRecordCount(); if(numRows == -1) { if(m_pRs->EndOfFile != VARIANT_TRUE) m_pRs->MoveFirst(); while(m_pRs->EndOfFile != VARIANT_TRUE) { numRows++; m_pRs->MoveNext(); } if(numRows > 0) m_pRs->MoveFirst(); } return numRows; } BOOL CADODatabase::Open(LPCTSTR lpstrConnection, LPCTSTR lpstrUserID, LPCTSTR lpstrPassword) { HRESULT hr = S_OK; if(IsOpen()) Close(); if(strcmp(lpstrConnection, _T("")) != 0) m_strConnection = lpstrConnection; ASSERT(!m_strConnection.IsEmpty()); try { if(m_nConnectionTimeout != 0) m_pConnection->PutConnectionTimeout(m_nConnectionTimeout); hr = m_pConnection->Open(_bstr_t(m_strConnection), _bstr_t(lpstrUserID), _bstr_t(lpstrPassword), NULL); return hr == S_OK; } catch(_com_error &e) { dump_com_error(e); return FALSE; } } void CADODatabase::dump_com_error(_com_error &e) { CString ErrorStr; _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); ErrorStr.Format( "CADODataBase Error\n\tCode = lx\n\tCode meaning = %s\n\tSource = %s\n\tDescription = %s\n", e.Error(), e.ErrorMessage(), (LPCSTR)bstrSource, (LPCSTR)bstrDescription); m_strErrorDescription = (LPCSTR)bstrDescription ; m_strLastError = _T("Connection String = " + GetConnectionString() + '\n' + ErrorStr); m_dwLastError = e.Error(); #ifdef _DEBUG AfxMessageBox(ErrorStr, MB_OK | MB_ICONERROR ); #endif throw CADOException(e.Error(), e.Description()); } BOOL CADODatabase::IsOpen() { if(m_pConnection ) return m_pConnection->GetState() != adStateClosed; return FALSE; } void CADODatabase::Close() { if(IsOpen()) m_pConnection->Close(); } /////////////////////////////////////////////////////// // // CADORecordset Class // CADORecordset::CADORecordset() { m_pRecordset = NULL; m_pCmd = NULL; m_strQuery = _T(""); m_strLastError = _T(""); m_dwLastError = 0; m_pRecBinding = NULL; m_pRecordset.CreateInstance(__uuidof(Recordset)); m_pCmd.CreateInstance(__uuidof(Command)); m_nEditStatus = CADORecordset::dbEditNone; m_nSearchDirection = CADORecordset::searchForward; } CADORecordset::CADORecordset(CADODatabase* pAdoDatabase) { m_pRecordset = NULL; m_pCmd = NULL; m_strQuery = _T(""); m_strLastError = _T(""); m_dwLastError = 0; m_pRecBinding = NULL; m_pRecordset.CreateInstance(__uuidof(Recordset)); m_pCmd.CreateInstance(__uuidof(Command)); m_nEditStatus = CADORecordset::dbEditNone; m_nSearchDirection = CADORecordset::searchForward; m_pConnection = pAdoDatabase->GetActiveConnection(); } BOOL CADORecordset::Open(_ConnectionPtr mpdb, LPCTSTR lpstrExec, int nOption) { Close(); if(strcmp(lpstrExec, _T("")) != 0) m_strQuery = lpstrExec; ASSERT(!m_strQuery.IsEmpty()); if(m_pConnection == NULL) m_pConnection = mpdb; m_strQuery.TrimLeft(); BOOL bIsSelect = m_strQuery.Mid(0, strlen("Select ")).CompareNoCase("select ") == 0 && nOption == openUnknown; try { m_pRecordset->CursorType = adOpenStatic; m_pRecordset->CursorLocation = adUseClient; if(bIsSelect || nOption == openQuery || nOption == openUnknown) m_pRecordset->Open((LPCSTR)m_strQuery, _variant_t((IDispatch*)mpdb, TRUE), adOpenStatic, adLockOptimistic, adCmdUnknown); else if(nOption == openTable) m_pRecordset->Open((LPCSTR)m_strQuery, _variant_t((IDispatch*)mpdb, TRUE), adOpenKeyset, adLockOptimistic, adCmdTable); else if(nOption == openStoredProc) { m_pCmd->ActiveConnection = mpdb; m_pCmd->CommandText = _bstr_t(m_strQuery); m_pCmd->CommandType = adCmdStoredProc; m_pConnection->CursorLocation = adUseClient; m_pRecordset = m_pCmd->Execute(NULL, NULL, adCmdText); } else { TRACE( "Unknown parameter. %d", nOption); return FALSE; } } catch(_com_error &e) { dump_com_error(e); return FALSE; } return m_pRecordset != NULL && m_pRecordset->GetState()!= adStateClosed; } BOOL CADORecordset::Open(LPCTSTR lpstrExec, int nOption) { ASSERT(m_pConnection != NULL); ASSERT(m_pConnection->GetState() != adStateClosed); return Open(m_pConnection, lpstrExec, nOption); } BOOL CADORecordset::OpenSchema(int nSchema, LPCTSTR SchemaID ) { try { _variant_t vtSchemaID = vtMissing; if(strlen(SchemaID) != 0) { vtSchemaID = SchemaID; nSchema = adSchemaProviderSpecific; } m_pRecordset = m_pConnection->OpenSchema((enum SchemaEnum)nSchema, vtMissing, vtSchemaID); return TRUE; } catch(_com_error &e) { dump_com_error(e); return FALSE; } } BOOL CADORecordset::Requery() { if(IsOpen()) { try { m_pRecordset->Requery(adExecuteRecord); } catch(_com_error &e) { dump_com_error(e); return FALSE; } } return TRUE; } BOOL CADORecordset::GetFieldValue(LPCTSTR lpFieldName, double& dbValue) { double val = (double)NULL; _variant_t vtFld; try { vtFld = m_pRecordset->Fields->GetItem(lpFieldName)->Value; switch(vtFld.vt) { case VT_R4: val = vtFld.fltVal; break; case VT_R8: val = vtFld.dblVal; break; case VT_DECIMAL: //Corrected by Jos?Carlos Mart�nez Gal�n val = vtFld.decVal.Lo32; val *= (vtFld.decVal.sign == 128)? -1 : 1; val /= pow(10, vtFld.decVal.scale); break; case VT_UI1: val = vtFld.iVal; break; case VT_I2: case VT_I4: val = vtFld.lVal; break; case VT_INT: val = vtFld.intVal; break; case VT_CY: //Added by John Andy Johnson!!!! vtFld.ChangeType(VT_R8); val = vtFld.dblVal; break; case VT_NULL: case VT_EMPTY: val = 0; break; default: val = vtFld.dblVal; } dbValue = val; return TRUE; } catch(_com_error &e) { dump_com_error(e); return FALSE; } } BOOL CADORecordset::GetFieldValue(int nIndex, double& dbValue) { double val = (double)NULL; _variant_t vtFld; _variant_t vtIndex;