adoconn.cpp

来自「本实例是vc+SQL server小程序,具有数据库的简单查询」· C++ 代码 · 共 107 行

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

#include "stdafx.h"
#include "MyTest.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()
{
	
}

//连接数据库
void ADOConn::OninitADOConn()
{
	
	::CoInitialize(NULL);
	try
	{
		m_pConnection.CreateInstance("ADODB.Connection");
		_bstr_t strConnect = "Provider=SQLOLEDB.1;Password=nudt;Persist Security Info=True;User ID=sa;Initial Catalog=MyTest;Data Source=ASUS";
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}
	catch (_com_error e) {
		AfxMessageBox(e.Description());
	}
	/*
	// 初始化OLE/COM库环境 
	::CoInitialize(NULL);
  
	try
	{
		// 创建Connection对象
		m_pConnection.CreateInstance("ADODB.Connection");
		// 设置连接字符串，必须是BSTR型或者_bstr_t类型
		_bstr_t strConnect = "Provider=SQLOLEDB; Server=asus;Database=MyTest; uid=sa; pwd=nudt;";
		m_pConnection->Open(strConnect,"","",adModeUnknown);
	}
	// 捕捉异常
	catch(_com_error e)
	{
		// 显示错误信息
		AfxMessageBox(e.Description());
	}
	*/
}

//返回记录集
_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;
}

//执行语句
BOOL ADOConn::ExecuteSQL(_bstr_t bstrSQL)
{
	try
	{
		if(m_pConnection == NULL)
			OninitADOConn();
		m_pConnection->Execute(bstrSQL,NULL,adCmdText);
		return true;
	}
	catch(_com_error e)
	{
		AfxMessageBox(e.Description());
		return false;
	}
}

//关闭记录集和连接
void ADOConn::ExitConnect()
{
	if(m_pRecordset != NULL)
		m_pRecordset->Close();
	m_pConnection->Close();
	
	::CoUninitialize();
}