vc+ado动态创建access数据库 
如何使用ado来动态创建access数据库。 
为了使用ado，必须引入微软的两个动态连接库msadox.dll和msado15.dll：

#pragma warning (disable: 4146)
#import "c:\Program Files\Common Files\system\ado\msadox.dll"
#import "c:\Program Files\Common Files\system\ado\msado15.dll" no_namespace rename("EOF", "EndOfFile")
#pragma warning (default: 4146)

将上述代码加入到stdafx.h文件中，由于ado是com组件，因此使用ado之前还要初始化com环境：

CoInitialize(NULL);

 

下面是一个在access数据库中创建表的sql语句的例子：

create table test
(
  name      text(20) WITH COMPRESSION not null,

  score      decimal(12,4) not null default 0,

  ID           smallint not null default 0,

  birthday   date,

  sex           char(1),

  CONSTRAINT CK_CH_SEX Check(SEX in ('N','V')),

  CONSTRAINT PK_ID Primary Key (ID)

);

 

使用ADOX::CatalogPtr来创建mdb文件：

 HRESULT hr = S_OK;
 
 //Set ActiveConnection of Catalog to this string
 CString strcnn(_T("Provider=Microsoft.JET.OLEDB.4.0;Data source = d:\\test.mdb"));


 try
 {
      ADOX::_CatalogPtr m_pCatalog = NULL;
      hr = m_pCatalog.CreateInstance(__uuidof (ADOX::Catalog));

      if(FAILED(hr))

     {

            _com_issue_error(hr);

       }

       else

       {
              m_pCatalog->Create(_bstr_t(strcnn)); //Create MDB

       }
 }  
 catch(_com_error &e)
 {
     // Notify the user of errors if any.
     AfxMessageBox(_T(“error“));
 }

 

创建一个连接对象打开刚刚建立的mdb文件：

_ConnectionPtr g_pConn;

 g_pConn.CreateInstance(__uuidof(Connection));

 g_pConn->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\test.mdb;", 
  "", "", adConnectUnspecified); 

 

下面函数用来执行sql文件中的sql语句：

// Function name : RunSqlScript
// Description  : 执行SQL脚本, peckermen@163.com, 2003-09-15
// Return type  : BOOL 成功返回TRUE
// Argument   : LPCSTR SqlScriptFile SQL脚本文件名
// Argument   : char separator SQL 分割符号, 缺省';' 
// Argument   : char Remark    SQL 注释符号, 缺省'-'
BOOL RunSqlScript(LPCSTR SqlScriptFile, char separator = ';', char Remark = '-')
{
 BOOL bRet = FALSE;
 CFileFind finder;
 CString ErrLong;
 if (finder.FindFile(SqlScriptFile) == TRUE)
 {
  CFile fSql;
  TCHAR *buffer, *pSQL, *p;
  
  fSql.Open(SqlScriptFile,CFile::modeRead);
  UINT nFileLength = fSql.GetLength();
  
  buffer = (TCHAR *)malloc((nFileLength + 1) * sizeof(TCHAR));
  _tcsnset(buffer, TCHAR('\0'), nFileLength + 1);

  UINT nBytesRead = fSql.Read(buffer,nFileLength); //把sql文件内容读入内存缓冲区
  fSql.Close();

  p = pSQL = buffer;
  BOOL bRunOK = FALSE;
  BOOL bInNote = FALSE;
  BOOL bSkip = FALSE;
  CString strSQL;
  TCHAR ch;
  ErrLog = _T("");
  while (p < (buffer + nFileLength)){
          //判断是否是注释行
   if (bInNote)
   {
    if (*p == TCHAR('\x0a'))
     bInNote = FALSE;
   }
   else
   {
    if ((*p == Remark) && (*(p+1) == Remark))
    {
     bInNote = TRUE;
     p++;
    }
    else
    {
            //判断是否是sql语句结束标志
     if (*p == separator){
      strSQL = _T("");
      bSkip = FALSE;
      while (pSQL < p)
      {
       if (bSkip == FALSE){
        if ((*(pSQL) == Remark) &&(*(pSQL+1) == Remark))
        {
         bSkip = TRUE;
         pSQL++;
        }
        else
        {
         ch = *pSQL;
         strSQL = strSQL+ch;
        }
       }
       else{
        if (*pSQL = TCHAR('\x0a')){
         bSkip = FALSE;
         ch = TCHAR(' ');
         strSQL = strSQL + ch;
        }
       }
       
       pSQL++;
      }
      pSQL = p + 1;
      ErrLog = ErrLog + _T("-- SQL Running ...\n");
      ErrLog = ErrLog + strSQL;
      
      _variant_t vRecords;
 
      m_nRecordsAffected = 0;

      try
      {
       g_pConn->CursorLocation = adUseClient;
       g_pConn->Execute(_bstr_t((LPCTSTR)strSQL), &vRecords, adExecuteNoRecords);
       m_nRecordsAffected = vRecords.iVal;
       bRunOK = TRUE;
      }
      catch(_com_error &e)
      {
       bRunOK = FALSE; 
      }
      
      if (bRunOK)
       ErrLog = ErrLog + _T("\n-- Successed!\n");
      else
      {
       ErrLog = ErrLog + _T("\n-- Failed!\n");
       break;
      }
      
     }
    }
   }
   p++;
  }
  free(buffer);
  bRet = bRunOK;
 }
 return bRet;
}

 

调用RunSqlScript创建access数据库中的表：

RunSqlScript(_T("d:\\test.sql"));

 

关闭数据库连接：

g_pConn->Close();

::CoUninitialize();

 

以上代码演示了怎样在vc中利用ado根据sql文件动态创建一个access数据库