dataado.h

来自「佳能相机的照相程序和SDK库CDSDK71 WIN以及编程手册」· C头文件 代码 · 共 90 行

#include "stdafx.h"
#include  <iostream.h>
#import "c:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF","adoEOF") 
 
class ADOConn
{ 
    public:
          ::_ConnectionPtr m_pConnection;
          ::_RecordsetPtr m_pRecordset;    public:
          ADOConn(void);
          //初始化-连接数据库
          void OnInitADOConn();
          //执行查询，返回结果集
          ::_RecordsetPtr & GetRecordSet(_bstr_t bstrSQL);
         //执行sql语句，更新数据库
         bool ExecuteSQL(_bstr_t bstrSQL);
         void ExitConnect();
};
void ADOConn::OnInitADOConn()
{
::CoInitialize(NULL);//   初始化OLE/COM库环境   ，为访问ADO接口做准备 
//AfxOleInit();//used in MFC
HRESULT hr;
try
{
  
   hr = m_pConnection.CreateInstance("ADODB.Connection");///创建Connection对象
   //_bstr_t strConnect="driver=sql server;server=(local);Provide=SQLOLEDB;Data Source=SHL;Initial Catalog=CutwordSet;User ID=;Password=;";
   _bstr_t strConnect="driver={sql server};server=(local);uid=;pwd=;database=CutwordSet";
   hr = m_pConnection->Open( strConnect,"", "", adModeUnknown);
   if(SUCCEEDED(hr))
    cout<<endl;
    //cout<<"连接数据库sucess"<<endl;

}
catch(_com_error e)///捕捉异常
{
   //CString errormessage;
   //errormessage.Format("连接数据库失败!\r\n错误信息:%s",e.ErrorMessage());
   //AfxMessageBox(errormessage);///显示错误信息
   cout<<"连接数据库失败！\r\n错误信息："<<e.Description()<<endl;
  
  
}
}_RecordsetPtr & ADOConn::GetRecordSet(_bstr_t bstrSQL)
{
try
{
   //连接数据库，如果connection对象为空，则重新连接数据库
   if(m_pConnection==NULL)
    OnInitADOConn();
   //创建记录集对象
   m_pRecordset.CreateInstance(_uuidof(Recordset));
   m_pRecordset->Open(bstrSQL,m_pConnection.GetInterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);
}
catch(_com_error e)
{
   
   cout<<e.Description()<<endl;
  
}
//返回记录集
return m_pRecordset;
}
bool ADOConn::ExecuteSQL(_bstr_t bstrSQL)
{
try
{
   //是否已经连接数据库
   if(m_pConnection ==NULL)
    OnInitADOConn();
   m_pConnection->Execute(bstrSQL,NULL,adCmdText);
   return true;
}
catch(_com_error e)
{
    //AfxMessageBox(e.Description());
   cout<<e.Description()<<endl;
   return false;
}
}
void ADOConn::ExitConnect()
{
//关闭记录集和连接
if(m_pRecordset !=NULL)
   m_pRecordset->Close();
m_pConnection->Close();
//释放环境
::CoUninitialize();//关闭ole/com库，释放资源
}