adoconn.cpp

VC下基于SQL的图书管理系统源代码

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

#include "stdafx.h"
#include "BookAdmi.h"
#include "ADOConn.h"

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

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

ADOConn::ADOConn()
{

}

ADOConn::~ADOConn()
{

}

void ADOConn::OnInitADOConn()							//初始化——连接数据库
{

	::CoInitialize(NULL);
	try
	{
		m_pConnection.CreateInstance("ADODB.Connection");
		_bstr_t strConnect="Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Password=sa;Initial Catalog=yym;Data Source=ICERAIN";
						//	Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=yym;Data Source=ICERAIN
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}

	catch(_com_error e)
	{
		AfxMessageBox("数据库连接出错，请检查语句");
	}

}


/*	_RecordsetPtr& GetRecordSet(_bstr_t bstrSQL);	//执行查询
	
	void ExitConnect();*/
BOOL ADOConn::ExecuteSQL(_bstr_t bstrSQL)				//执行SQL语句，Insert Update _variant_t
{
	_variant_t RecordsAffected;
	try
	{
		if(m_pConnection==NULL)
			OnInitADOConn();
		m_pConnection->Execute(bstrSQL,NULL,adCmdText);
		return true;
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		return false;
	}
}


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

_RecordsetPtr& ADOConn::GetRecordSet(_bstr_t bstrSQL)
{
	try
	{
		if(m_pConnection==NULL)
			OnInitADOConn();
		m_pRecordset.CreateInstance(__uuidof(Recordset));
		m_pRecordset->Open(bstrSQL,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
	
	}
	catch(_com_error e)
	{
		
		AfxMessageBox(e.Description());
	}
	return m_pRecordset;
}