Visual C++多线程DAO处理

核心提示： 加在Multidaorecordset.cpp中：// MultiDaoRecordSet.cpp : implementation file//#define MULTIDAORECORDSET_CPP#include "stdafx.h"#include "

　　加在Multidaorecordset.cpp中：
// MultiDaoRecordSet.cpp : implementation file
//
　　#define MULTIDAORECORDSET_CPP
　　#include "stdafx.h"
　　#include "MyApp.h"
　　#include "MultiDaoRecordSet.h"
　　#include "mainfrm.h"
　　#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
　　/////////////////////////////////////////////////////////////////////////////
// CMultiDaoRecordSet
　　IMPLEMENT_DYNAMIC(CMultiDaoRecordSet, CDaoRecordset)
　　CMultiDaoRecordSet::CMultiDaoRecordSet(CDaoDatabase* pdb)
: CDaoRecordset(pdb)
{
//{{AFX_FIELD_INIT(CMultiDaoRecordSet)
//}}AFX_FIELD_INIT
m_nDefaultType = dbOpenDynaset;
}
　　//jtm
//thread safe destructor....
CMultiDaoRecordSet::~CMultiDaoRecordSet()
{
if (IsOpen())
Close();
　　// Clean up database if necessary
if (m_pDatabase != NULL && (m_nStatus & AFX_DAO_IMPLICIT_DB))
{
m_pDatabase->Close();
delete m_pDatabase;
m_pDatabase = NULL;
}
}
　　CString CMultiDaoRecordSet::GetDefaultDBName()
{
CMyApp *pApp = ((CMYApp *)AfxGetApp());
return pApp->GetDatabaseFullPath();
}
　　/////////////////////////////////////////////////////////////////////////////
// CMultiDaoRecordSet diagnostics
　　//jtm
//multi thread safe functoins
void CMultiDaoRecordSet::Open(int nOpenType, LPCTSTR lpszSQL, int nOptions)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Open(nOpenType, lpszSQL, nOptions);
}
else
{
pParam1 = (void *)&nOpenType;
pParam2 = (void *)lpszSQL;
pParam3 = (void *)&nOptions;
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoOpen, (LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Close()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Close();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoClose, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsOpen()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsOpen();
}
else
{
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsOpen, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsBOF()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsBOF();
}
else
{
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsBOF, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsEOF()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsEOF();
}
else
{
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsEOF, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsDeleted()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsDeleted();
}
else
{
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsDeleted, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsFieldDirty(void* pv)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsFieldDirty(pv);
}
else
{
pParam1 = pv;
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsFieldDirty, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsFieldNull(void* pv)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsFieldNull(pv);
}
else
{
pParam1 = pv;
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsFieldNull, (LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::IsFieldNullable(void* pv)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::IsFieldNullable(pv);
}
else
{
pParam1 = pv;
return (BOOL)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoIsFieldNullable, (LPARAM)this);
}
}
　　CString CMultiDaoRecordSet::GetName()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetName();
}
else
{
return (CString)*(CString *)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetName, (LPARAM)this);
}
}
　　short CMultiDaoRecordSet::GetType()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetType();
}
else
{
return (short)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetType, (LPARAM)this);
}
}
　　short CMultiDaoRecordSet::GetEditMode()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetEditMode();
}
else
{
return (short)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetEditMode, (LPARAM)this);
}
}
　　CString CMultiDaoRecordSet::GetSQL()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetSQL();
}
else
{
return (CString)*(CString *)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetSQL, (LPARAM)this);
}
}
　　COleVariant CMultiDaoRecordSet::GetLastModifiedBookmark()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetLastModifiedBookmark();
}
else
{
return (COleVariant)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetLastModifiedBookmark, (LPARAM)this);
}
}
　　long CMultiDaoRecordSet::GetRecordCount()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetRecordCount();
}
else
{
return (long)AfxGetMainWnd()->
SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetRecordCount, (LPARAM)this);
}
}
　　void CMultiDaoRecordSet::MoveNext()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::MoveNext();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoMoveNext,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::MovePrev()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::MovePrev();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoMovePrev,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::MoveFirst()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::MoveFirst();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoMoveFirst,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::MoveLast()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::MoveLast();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoMoveLast,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Move(long lRows)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Move(lRows);
}
else
{
pParam1 = (void *)&lRows;
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoMove,
(LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::FindNext(LPCTSTR lpszFilter)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::FindNext(lpszFilter);
}
else
{
pParam1 = (void *)lpszFilter;
return (BOOL)AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoFindNext,
(LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::FindPrev(LPCTSTR lpszFilter)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::FindPrev(lpszFilter);
}
else
{
pParam1 = (void *)lpszFilter;
return (BOOL)AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoFindPrev,
(LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::FindFirst(LPCTSTR lpszFilter)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::FindFirst(lpszFilter);
}
else
{
pParam1 = (void *)lpszFilter;
return (BOOL)AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoFindFirst,
(LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::FindLast(LPCTSTR lpszFilter)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::FindLast(lpszFilter);
}
else
{
pParam1 = (void *)lpszFilter;
return (BOOL)AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoFindLast,
(LPARAM)this);
}
}
　　BOOL CMultiDaoRecordSet::Find(long lFindType, LPCTSTR lpszFilter)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::Find(lFindType, lpszFilter);
}
else
{
pParam1 = (void *)&lFindType;
pParam2 = (void *)lpszFilter;
return (BOOL)AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoFind,
(LPARAM)this);
}
}
　　COleVariant CMultiDaoRecordSet::GetBookmark()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
return CDaoRecordset::GetBookmark();
}
else
{
return AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoGetBookmark,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::SetBookmark(COleVariant varBookmark)
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::SetBookmark(varBookmark);
}
else
{
pParam1 = (void *)&varBookmark;
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoSetBookmark,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::AddNew()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::AddNew();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoAddNew,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Edit()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Edit();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoEdit,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Update()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Update();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoUpdate,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Delete()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Delete();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoDelete,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::CancelUpdate()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::CancelUpdate();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoCancelUpdate,
(LPARAM)this);
}
}
　　void CMultiDaoRecordSet::Requery()
{
CMYApp *pApp = ((CMYApp *)AfxGetApp());
if (pApp->pGUIThread == AfxGetThread())
{
CDaoRecordset::Requery();
}
else
{
AfxGetMainWnd()->SendMessage(WM_MULTIDAOMESSAGE, MultiDaoRequery,
(LPARAM)this);
}
}
　　and, Multidaorecordset.h
#if !defined(AFX_MULTIDAORECORDSET_H__BECC8DC3_A967_11D2_BA4C_006097808646__INCLUDED_)
#define AFX_MULTIDAORECORDSET_H__BECC8DC3_A967_11D2_BA4C_006097808646__INCLUDED_
　　#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
// MultiDaoRecordSet.h : header file
//
　　/////////////////////////////////////////////////////////////////////////////
// CMultiDaoRecordSet DAO recordset
　　enum {
MultiDaoOpen,
MultiDaoClose,
MultiDaoIsOpen,
MultiDaoIsBOF,
MultiDaoIsEOF,
MultiDaoIsDeleted,
MultiDaoIsFieldDirty,
MultiDaoIsFieldNull,
MultiDaoIsFieldNullable,
MultiDaoGetName,
MultiDaoGetType,
MultiDaoGetSQL,
MultiDaoGetEditMode,
MultiDaoGetLastModifiedBookmark,
MultiDaoGetRecordCount,
MultiDaoMoveNext,
MultiDaoMovePrev,
MultiDaoMoveFirst,
MultiDaoMoveLast,
MultiDaoMove,
MultiDaoFindNext,
MultiDaoFindPrev,
MultiDaoFindFirst,
MultiDaoFindLast,
MultiDaoFind,
MultiDaoGetBookmark,
MultiDaoSetBookmark,
MultiDaoAddNew,
MultiDaoEdit,
MultiDaoUpdate,
MultiDaoDelete,
MultiDaoCancelUpdate,
MultiDaoRequery,
};
　　#ifdef MULTIDAORECORDSET_CPP
CString cDAOMessageArray[] =
{
"MultiDaoOpen",
"MultiDaoClose",
"MultiDaoIsOpen",
"MultiDaoIsBOF",
"MultiDaoIsEOF",
"MultiDaoIsDeleted",
"MultiDaoIsFieldDirty",
"MultiDaoIsFieldNull",
"MultiDaoIsFieldNullable",
"MultiDaoGetName",
"MultiDaoGetType",
"MultiDaoGetSQL",
"MultiDaoGetEditMode",
"MultiDaoGetLastModifiedBookmark",
"MultiDaoGetRecordCount",
"MultiDaoMoveNext",
"MultiDaoMovePrev",
"MultiDaoMoveFirst",
"MultiDaoMoveLast",
"MultiDaoMove",
"MultiDaoFindNext",
"MultiDaoFindPrev",
"MultiDaoFindFirst",
"MultiDaoFindLast",
"MultiDaoFind",
"MultiDaoGetBookmark",
"MultiDaoSetBookmark",
"MultiDaoAddNew",
"MultiDaoEdit",
"MultiDaoUpdate",
"MultiDaoDelete",
"MultiDaoCancelUpdate",
"MultiDaoRequery",
};
#else
extern CString cDAOMessageArray[];
#endif
　　class CMultiDaoRecordSet : public CDaoRecordset
{
public:
//jtm
//FORCE user to pass database...
CMultiDaoRecordSet(CDaoDatabase* pDatabase);
　　~CMultiDaoRecordSet();
DECLARE_DYNAMIC(CMultiDaoRecordSet)
　　// Field/Param Data
//{{AFX_FIELD(CMultiDaoRecordSet, CDaoRecordset)
//}}AFX_FIELD
　　// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMultiDaoRecordSet)
public:
virtual CString GetDefaultDBName(); // Default database name
//}}AFX_VIRTUAL
　　// Implementation
//jtm
//redefined public functions
//Note: I am only redefining SOME
//of the public functions this is NOT
//a FULL implementation !!!!!!
public:
//jtm -- only supporting this open.....
virtual void Open(int nOpenType = AFX_DAO_USE_DEFAULT_TYPE,
LPCTSTR lpszSQL = NULL, int nOptions = 0);
virtual void Close();
BOOL IsOpen();
BOOL IsBOF();
BOOL IsEOF();
BOOL IsDeleted();
BOOL IsFieldDirty(void* pv);
BOOL IsFieldNull(void* pv);
BOOL IsFieldNullable(void* pv);
CString GetName();
short GetType();
short GetEditMode();
CString GetSQL();
COleVariant GetLastModifiedBookmark();
long GetRecordCount();
void MoveNext();
void MovePrev();
void MoveFirst();
void MoveLast();
virtual void Move(long lRows);
BOOL FindNext(LPCTSTR lpszFilter);
BOOL FindPrev(LPCTSTR lpszFilter);
BOOL FindFirst(LPCTSTR lpszFilter);
BOOL FindLast(LPCTSTR lpszFilter);
virtual BOOL Find(long lFindType, LPCTSTR lpszFilter);
COleVariant GetBookmark();
void SetBookmark(COleVariant varBookmark);
virtual void AddNew();
virtual void Edit();
virtual void Update();
virtual void Delete();
virtual void CancelUpdate();
virtual void Requery();
　　void *pParam1;
void *pParam2;
void *pParam3;
};
　　//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the //previous line.
　　#endif // !defined(AFX_MULTIDAORECORDSET_H__BECC8DC3_A967_11D2_BA4C_006097808646__INCLUDED_)

调试的东西等你搞好你的程序后就可以删了，不过要注意，不要直接调用CDaoRecordset，否则，你的应用程序就会问题。我试了一下，使用这个类的时候，你的计算机的速度会稍微的暂停几秒钟(正在运行你的程序)，不过这不会影响到你的计算机的使用的，因为这个类DAO的调用是通过GUI的，如果你使用不当的话(比如临界区问题)就会导致计算机的死锁。