VC++连接SQLServer
VC++连接SQLServer
/*
*连接SQL
*/
void CMFCSQLDlg::OnButton3()
{
// TODO: Add your control notification handler code here
_ConnectionPtr m_pConnection;
// 在应用程序的InitInstance函数里加入
if(S_OK!=CoInitialize(NULL))
{
AfxMessageBox("初始化COM库错误!");
}else
{
AfxMessageBox("初始化COM库成功!");
}
// 连接数据库：
HRESULT hr; //返回结果变量
try
{
hr=m_pConnection.CreateInstance("ADODB.Connection"); //创建Connection对象
if(SUCCEEDED(hr))
{
//hr=m_pConnection->Open("Provider=SQLOLEDB;Server=808644DA83B446C/SQLEXPRESS;Database=ChinabaseSQLServer;UserID=sa;pwd=123","","",adModeUnknown); //;Integrated Security=SSPI
m_pConnection->Open("Provider=SQLOLEDB.1;Server=808644DA83B446C//SQLEXPRESS;DATABASE=ChinabaseSQLServer;UID=sa;PWD=123;","","",adModeUnknown);
MessageBox("连接SQL运行成功!","成功",MB_OK);
_CommandPtr m_pCommand;
_RecordsetPtr m_pRecordset;
m_pCommand.CreateInstance("ADODB.Command");
_variant_t vNULL;
vNULL.vt = VT_ERROR;
vNULL.scode = DISP_E_PARAMNOTFOUND;///定义为无参数
m_pCommand->ActiveConnection = m_pConnection;///非常关键的一句，将建立的连接赋值给它
m_pCommand->CommandText = "SELECT * FROM MTables order by tname";///命令字串
m_pRecordset = m_pCommand->Execute(&vNULL,&vNULL,adCmdText);///执行命令，取得记录集
m_pRecordset->MoveFirst();
for(;!m_pRecordset->adoEOF;m_pRecordset->MoveNext())
{
// printf(m_pRecordset->GetCollect(("myage")));
_variant_t var;
var = m_pRecordset->GetCollect(("tname"));
if(var.vt!=VT_NULL)
{
//printf((LPCTSTR)_bstr_t(var));
AfxMessageBox((LPCTSTR)_bstr_t(var));
}
}
}
}
catch(_com_error e)
{
CString errorMsg;
errorMsg.Format("连接数据库失败!/r/n错误信息:%s",e.ErrorMessage());
MessageBox(errorMsg,"错误",MB_OK);
}
}