#include "stdafx.h"
#include <stdio.h>
#import "c:\program files\common files\system\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")

int main(int argc, char* argv[])
{

	char term[]="KN 04";

	_ConnectionPtr m_pConnection;  //到access数据库的链接对象
	_RecordsetPtr m_pRecordset;  //结果集对象
    CoInitialize(NULL);  //初始化
	m_pConnection.CreateInstance(__uuidof(Connection)); //实例化对象

	//连到具体某个mdb
	try
    {
        m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=supp_desc.mdb", "", "", adModeUnknown);
    }
    catch(_com_error e)
    {
        printf("数据库连接失败！");
        return 0;
    }

    m_pRecordset.CreateInstance(__uuidof(Recordset)); //实例化结果集对象
	//执行sql语句
	try
    {
		char sql[300];
		memset(sql,0,300);
		strcat(sql,"SELECT descr FROM sd WHERE supp=\'");
		strcat(sql,term);
		strcat(sql,"\'");
        m_pRecordset->Open(sql, m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);
    }
    catch(_com_error *e)
    {
        printf(e->ErrorMessage());
        if(m_pConnection->State)
        {
            m_pConnection->Close();
            m_pConnection= NULL;
        }
        return 0;
    }
	
	//处理结果集
	try
    {	
		//若结果为空，结束
		if(m_pRecordset->BOF)
        {
			printf("表内数据为空！");
			if(m_pConnection->State)
			{
				m_pRecordset->Close();
                m_pRecordset = NULL;
                m_pConnection->Close();
                m_pConnection= NULL;
            }
            return 0;
        }
		//游标定位到第一条记录
		m_pRecordset->MoveFirst();
		_variant_t var; //从结果集中取出的数据放到var中
        char *t1; 
		while(!m_pRecordset->adoEOF)
        {
            var= m_pRecordset->GetCollect("descr");
            if(var.vt != VT_NULL)
            {
				t1 = _com_util::ConvertBSTRToString((_bstr_t)var);
			}
			printf(t1);
			printf("\n");
            m_pRecordset->MoveNext();
        }
	}
	catch(_com_error *e)
    {
        printf(e->ErrorMessage());
    }


	//退出程序时的处理
	if(m_pConnection->State)
    {
        m_pRecordset->Close();
        m_pRecordset = NULL;
        m_pConnection->Close();
        m_pConnection= NULL;
    }
	return 0;
}