dataconn.cpp

成本预测系统

// DataConn.cpp: implementation of the DataConn class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Predict.h"
#include "DataConn.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

DataConn::DataConn()
{

}

DataConn::~DataConn()
{

}
void DataConn::DataInit()
{
	::CoInitialize(NULL); //初始化COM环境变量
	
	try
	{
		m_pConnection.CreateInstance(__uuidof(Connection));//定义指向定义ADO对象的指针类型 
		
		_bstr_t strConnect="Provider=MSDASQL.1;Persist Security Info=False;Data Source=data";
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}
	
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		
	}

}
_RecordsetPtr DataConn::GetRecordset(_bstr_t sql)
{
	try
	{
		if(m_pConnection==NULL)
			DataInit();
		m_pRecordset.CreateInstance(__uuidof(Recordset));
		
		m_pRecordset->Open(sql,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
		
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		
	}
	
   return m_pRecordset;
}
BOOL DataConn::SQLExecute(_bstr_t sql)
{
	try
	{
		if(m_pConnection==NULL)
			DataConn();
		m_pConnection->Execute(sql,NULL,adCmdText);
		return true;
		
	}
    catch(_com_error e)
	{
		::AfxMessageBox(e.Description());
		return false;
	}
}

void DataConn::ExitSql()
{
   if(m_pRecordset!=NULL)
	  m_pRecordset->Close();
   m_pConnection->Close();
	   
   ::CoUninitialize();
}

BOOL DataConn::SetData(float x,float y)
{
	DataInit();
	_bstr_t sql="select * from dataTable";
	_RecordsetPtr recordset;
	recordset=GetRecordset(sql);
	recordset->AddNew();
	recordset->PutCollect("input",_variant_t(x));
	recordset->PutCollect("out",_variant_t(y));
	recordset->Update();
	ExitSql();
	return true;
}