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vc++中,用ado执行sql server存储过程,并且取得返回值的例子

variant_t RecordsAffected; string szSql = (string)"P_KS_ADDUSER '" + m_szName+ "','" + m_szPasswd +"';"; try {  _CommandPtr ptrCmd;  ptrCmd.CreateInstance(__uuidof(Command));  ptrCmd->ActiveConnection = pContext->GetConnection();   VARIANT vtRoyalty;   vtRoyalty = COleVariant((long)0);  ptrCmd->Parameters->Append(   ptrCmd->CreateParameter("Return", adInteger, adParamReturnValue,sizeof(int),vtRoyalty));   vtRoyalty = COleVariant(m_szName.c_str());  ptrCmd->Parameters->Append(   ptrCmd->CreateParameter("Name", adChar, adParamInput,m_szName.size(),vtRoyalty));   vtRoyalty = COleVariant(m_szPasswd.c_str());  ptrCmd->Parameters->Append(   ptrCmd->CreateParameter("Pass", adChar, adParamInput,m_szPasswd.size(),vtRoyalty));   ptrCmd->CommandText = "P_KS_ADDUSER";  ptrCmd->CommandType = adCmdStoredProc;  ptrCmd->Execute(NULL,NULL,adCmdStoredProc);   cout<<"添加用户成功,id="<<(unsigned int)ptrCmd->Parameters->GetItem("Return")->GetValue()<<endl;  //cout<<"add id:"<<(unsigned int)ptrCmd->GetParameters()->GetItem(0)<<endl;  //pContext->GetNetworkSender()->SendPack(); } catch(_com_error e) {  cout<<"增加用户的时候发生异常:"<<(LPCSTR)e.Description()<<endl;  return; }要是有多个值要返回,那么可以使用输出参数(output parameter)的方法;要是需要返回一个数组,可以使用返回数据集的方法。


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