vc connect access/mssql/oracle

 

1.ACCESS 2000

    _ConnectionPtr m_pConn;
    CString m_sConn="Provider=Microsoft.Jet.OLEDB.4.0.1;Data Source=d://db1.mdb";
    m_pConn.CreateInstance("ADODB.Connection");
    try
    {
        HRESULT hr=m_pConn->Open((_bstr_t)m_sConn,"","",adConnectUnspecified);   
        if (FAILED(hr))
        {
            AfxMessageBox("不能连接数据库 source!");
            return FALSE;
        }
    }
    catch(_com_error e)
    {
        AfxMessageBox("不能连接数据库 error!");
        return FALSE;
    }

2.SQL Server 2000

    _ConnectionPtr m_pConn;
    CString m_sConn="Provider=SQLOLEDB.1;Data Source=192.168.3.9;Initial
Catalog=sode"; //sode是数据库服务器192.168.3.9上的一个数据库
    m_pConn.CreateInstance("ADODB.Connection");
    try
    {
        HRESULT hr=m_pConn->Open((_bstr_t)m_sConn,"sa","mapper",adConnectUnspecified);   
        if (FAILED(hr))
        {
            AfxMessageBox("不能连接数据库 source!");
            return FALSE;
        }
    }
    catch(_com_error e)
    {
        AfxMessageBox("不能连接数据库 error!");
        return FALSE;
    }

3.Oracle 9i

    _ConnectionPtr m_pConn;
    CString m_sConn="Provider=MSDAORA.1;Data Source=sode_192.168.3.9"; //使用
ms连接库，sode为SID，192.168.3.9为机器ip
    m_pConn.CreateInstance("ADODB.Connection");
    try
    {
        HRESULT hr=m_pConn->Open((_bstr_t)m_sConn,"sodeUser","sodePw",adConnectUnspecified);   
        if (FAILED(hr))
        {
            AfxMessageBox("不能连接数据库 source!");
            return FALSE;
        }
    }
    catch(_com_error e)
    {
        AfxMessageBox("不能打开数据库 error!");
        return FALSE;
    }