campo-sirio/ce/columnst.cpp

// sqlcols.cpp: implementation of the CColumns class
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1993 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and Microsoft
// QuickHelp and/or WinHelp documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.


#include "stdafx.h"
#include "columnst.h"

/////////////////////////////////////////////////////////////////////////////
// CColumns implementation

// IMPLEMENT_DYNAMIC(CColumns, CRecordset)

CColumns::CColumns(CDatabase* pDatabase)
  : CRecordset(pDatabase)
{
  //{{AFX_FIELD_INIT(CColumns)
  m_strQualifier = "";
  m_strOwner = "";
  m_strTableName = "";
  m_strColumnName = "";
  m_nDataType = 0;
  m_strTypeName = "";
  m_lPrecision = 0;
  m_lLength = 0;
  m_nScale = 0;
  m_nRadix = 0;
  m_nFields = 11;
  //}}AFX_FIELD_INIT
  m_strQualifierParam = "";
  m_strOwnerParam = "";
  m_strTableNameParam = "";
  m_strColumnNameParam = "";
}

BOOL CColumns::Open(UINT nOpenType /* = snapshot */,
  LPCSTR lpszSQL /* = NULL */, DWORD dwOptions /* = none */)
{
  RETCODE nRetCode;
  ASSERT(lpszSQL == NULL);

  // Allocation and opening of database not supported
  if (m_hstmt == SQL_NULL_HSTMT)
  {
    CString strDefaultConnect;
    TRY
    {
      if (m_pDatabase == NULL)
      {
        m_pDatabase = new CDatabase();
        m_bRecordsetDb = TRUE;
      }

      strDefaultConnect = GetDefaultConnect();
      // If not already opened, attempt to open
      if (!m_pDatabase->IsOpen() &&
        !m_pDatabase->Open("", FALSE, FALSE, strDefaultConnect))
        return FALSE;

      AFX_SQL_SYNC(::SQLAllocStmt(m_pDatabase->m_hdbc, &m_hstmt));
      if (!Check(nRetCode))
        ThrowDBException(SQL_INVALID_HANDLE);
    }
    CATCH_ALL(e)
    {
#ifdef _DEBUG
      if (afxTraceFlags & 0x20)
        TRACE0("Error: CDatabase create for CRecordset failed\n");
#endif // _DEBUG
      strDefaultConnect.Empty();
      if (m_bRecordsetDb)
      {
        delete m_pDatabase;
        m_pDatabase = NULL;
      }
      ASSERT(m_hstmt == SQL_NULL_HSTMT);
      THROW_LAST();
    }
    END_CATCH_ALL
  }

  TRY
  {
    // set any options, like timeouts, scrolling options
    OnSetOptions(m_hstmt);

    // call the ODBC catalog function with data member params
    RETCODE nRetCode;
    AFX_SQL_ASYNC(this, ::SQLColumns(m_hstmt,
      (m_strQualifierParam.IsEmpty()? (UCHAR FAR *)NULL: (UCHAR FAR *)(const char*)m_strQualifierParam), SQL_NTS,
      (m_strOwnerParam.IsEmpty()? (UCHAR FAR *)NULL: (UCHAR FAR *)(const char*)m_strOwnerParam), SQL_NTS,
      (m_strTableNameParam.IsEmpty()? (UCHAR FAR *)NULL: (UCHAR FAR *)(const char*)m_strTableNameParam), SQL_NTS,
      NULL, SQL_NTS));
    if (!Check(nRetCode))
    {
      AfxThrowDBException(nRetCode, m_pDatabase, m_hstmt);
    }
#ifdef WIN32
	AllocStatusArrays();
	AllocAndCacheFieldInfo();
    AllocRowset();
#endif
	// load first record
    MoveFirst();
  }
  CATCH_ALL(e)
  {
    Close();
    THROW_LAST();
  }
  END_CATCH_ALL
  return TRUE;
}

CString CColumns::GetDefaultConnect()
{
  // this minimal connect string will cause ODBC login dialog to be brought up
  return "ODBC;";
}

CString CColumns::GetDefaultSQL()
{
  // there is no default SQL - a direct ODBC call is made instead
  ASSERT(FALSE);
  return "!";
}

void CColumns::DoFieldExchange(CFieldExchange* pFX)
{
  //{{AFX_FIELD_MAP(CColumns)
  pFX->SetFieldType(CFieldExchange::outputColumn);
  RFX_Text(pFX, "table_qualifier", m_strQualifier);
  RFX_Text(pFX, "table_owner", m_strOwner);
  RFX_Text(pFX, "table_name", m_strTableName);
  RFX_Text(pFX, "column_name", m_strColumnName);
  RFX_Int(pFX, "data_type", m_nDataType);
  RFX_Text(pFX, "type_name", m_strTypeName);
  RFX_Long(pFX, "precision", m_lPrecision);
  RFX_Long(pFX, "length", m_lLength);
  RFX_Int(pFX, "scale", m_nScale);
  RFX_Int(pFX, "radix", m_nRadix);
  RFX_Int(pFX, "nullable", m_nNullable);
  //}}AFX_FIELD_MAP
}