VC连接MySql操作

1.在stdAfx.h中导入：

#import "C:\program files\common files\system\ado\msado15.dll" no_namespace rename ("EOF", "adoEOF")

2.在::InitInstance()中初始化：

BOOL CMYSQLApp::InitInstance()
{   


	CoInitialize(NULL); //初始化Com组件
	//conPtr=NULL;
	//_ConnectionPtr conPtr; //数据库链接指针
	conPtr.CreateInstance("ADODB.Connection"); //Connection用于与数据库服务器的链接
	//conPtr.CreateInstance(__uuidof(Connection)); //Connection用于与数据库服务器的链接另一种方式
	// MySQL ODBC 5.1 Driver为驱动名称（取决于我们为MySql安装的驱动），localhost为服务器地址，test为数据库名，root为用户名（MySql默认用户名为root），sa为密码
	CString conStr=_T("Driver={MySQL ODBC 5.1 Driver};Server=localhost;Database=test1;");
	/******************连接数据库********************/
	try
	{
		conPtr->ConnectionTimeout = 5; //设置连接时间
		conPtr->Open((_bstr_t)conStr, _T("root"),_T("root"), adModeUnknown);
	}
	catch(_com_error e) //捕捉异常
	{
		AfxMessageBox(e.ErrorMessage());
	} 
	CoUninitialize(); //释放com组件
 
		AfxEnableControlContainer();

3.增删改查语句：

void CMYSQLDlg::OnButton1() //查
{
	//CoInitialize(NULL);
	UpdateData();
	// TODO: Add your control notification handler code here
	//_ConnectionPtr conPtr; //数据库链接指针
	_RecordsetPtr recordPtr;//数据集指针
	recordPtr.CreateInstance(__uuidof(Recordset));
    
	CString cmdStr=_T("select * from  aa");//
	//((CMYSQLApp*)AfxGetApp())->
	try{
	
	recordPtr->Open(_variant_t(cmdStr),((CMYSQLApp*)AfxGetApp())->conPtr.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
	}
	catch(_com_error e)
	{
		e.Description();
		
	}
	recordPtr->MoveFirst();
	while (!(recordPtr->adoEOF))
	{//获取记录
		//CString name=(CString)recordPtr->GetCollect(_variant_t("id")).bstrVal;
		int no=recordPtr->GetCollect(_variant_t("id")).intVal;
		CString str;
		str.Format("%d",no);
		m_id=str;
		UpdateData(false);
		recordPtr->MoveNext();
		//break;
	}
/*	recordPtr->Close();//关闭记录集

    ((CMYSQLApp*)AfxGetApp())->conPtr->Close();//关闭连接
	recordPtr.Release();//释放空间
    ((CMYSQLApp*)AfxGetApp())->conPtr.Release();//释放空间*/
}

void CMYSQLDlg::OnButton2() //删
{
	// TODO: Add your control notification handler code here
	UpdateData();
	_RecordsetPtr recordPtr;//数据集指针
	recordPtr.CreateInstance(__uuidof(Recordset));
	int n;
	n=atoi(m_id);
	CString cmdStr;
	cmdStr.Format(_T("delete from aa where id=%d"),n);//
	try{
	
	recordPtr->Open(_variant_t(cmdStr),((CMYSQLApp*)AfxGetApp())->conPtr.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
	}
	catch(_com_error e)
	{
		e.Description();
		
	}
	
}

void CMYSQLDlg::OnButton3() //、增
{
	// TODO: Add your control notification handler code here
	UpdateData();
	_RecordsetPtr recordPtr;//数据集指针
	recordPtr.CreateInstance(__uuidof(Recordset));
	int n;
    n=atoi(m_id);
	CString cmdStr;
	cmdStr.Format(_T("insert into aa values(%d)"),n);//
	try{
	recordPtr->Open(_variant_t(cmdStr),((CMYSQLApp*)AfxGetApp())->conPtr.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
	}
	catch(_com_error e)
	{
		e.Description();
		
	}
	
}

void CMYSQLDlg::OnButton4() //改
{
	// TODO: Add your control notification handler code here
	UpdateData();
	_RecordsetPtr recordPtr;//数据集指针
	recordPtr.CreateInstance(__uuidof(Recordset));
	int n;
    n=atoi(m_id);
	//n=7;
	//CString cmdStr=_T("insert into aa values(%d)",m_dd);//
	CString cmdStr;
	cmdStr.Format(_T("update aa set id=%d where id=%d"),m_dd,n);//
	try{
	recordPtr->Open(_variant_t(cmdStr),((CMYSQLApp*)AfxGetApp())->conPtr.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
	}
	catch(_com_error e)
	{
		e.Description();
		
	}
	
}