BOOL CColumns::Open(UINT nOpenType /* = snapshot */,
LPCSTR lpszSQL /* = NULL */, DWORD dwOptions /* = none */)
{
#ifdef WIN32
ASSERT(lpszSQL == NULL);
RETCODE nRetCode;
// Cache state info and allocate hstmt
SetState(nOpenType,NULL,noDirtyFieldCheck | dwOptions);
if (!AllocHstmt())
return FALSE;
TRY
{
OnSetOptions(m_hstmt);
AllocStatusArrays();
// call the ODBC catalog function with data member params
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))
ThrowDBException(nRetCode, m_hstmt);
// Allocate memory and cache info
AllocAndCacheFieldInfo();
AllocRowset();
// Fetch the first row of data
MoveNext();
// If EOF, result set is empty, set BOF as well
m_bBOF = m_bEOF;
}
CATCH_ALL(e)
{
Close();
THROW_LAST();
}
END_CATCH_ALL
return TRUE;
#else // WIN16
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);
// return FALSE; #JB951122
}
CATCH_ALL(e)
{
#ifdef _DEBUG
if (afxTraceFlags & 0x20)
TRACE0("Error: CDatabase create for CRecordset failed\n");
#endif // _DEBUG
strDefaultConnect.Empty();
if (m_bRecordsetDb)
{
DELETE_OBJ (m_pDatabase);
}
ASSERT(m_hstmt == SQL_NULL_HSTMT);
THROW_LAST();
}
END_CATCH_ALL
}
BOOL CCurRecordset::Open(UINT nOpenType, LPCTSTR lpszSQL, DWORD dwOptions)
{
ASSERT(!IsOpen());
ASSERT_VALID(this);
ASSERT(lpszSQL == NULL || AfxIsValidString(lpszSQL));
ASSERT(nOpenType == AFX_DB_USE_DEFAULT_TYPE ||
nOpenType == dynaset || nOpenType == snapshot ||
nOpenType == forwardOnly || nOpenType == dynamic);
ASSERT(!(dwOptions & readOnly && dwOptions & appendOnly));
// Can only use optimizeBulkAdd with appendOnly recordsets
ASSERT((dwOptions & optimizeBulkAdd && dwOptions & appendOnly) ||
!(dwOptions & optimizeBulkAdd));
// forwardOnly recordsets have limited functionality
ASSERT(!(nOpenType == forwardOnly && dwOptions & skipDeletedRecords));
// Cache state info and allocate hstmt
SetState(nOpenType, lpszSQL, dwOptions);
if (!AllocHstmt())
return FALSE;
// Check if bookmarks upported (CanBookmark depends on open DB)
ASSERT(dwOptions & useBookmarks ? CanBookmark() : TRUE);
TRY
{
OnSetOptions(m_hstmt);
// Allocate the field/param status arrays, if necessary
BOOL bUnbound = FALSE;
if (m_nFields > 0 || m_nParams > 0)
AllocStatusArrays();
else
bUnbound = TRUE;
// Build SQL and prep/execute or just execute direct
m_strSQL = lpszSQL;
PrepareAndExecute();
// Cache some field info and prepare the rowset
AllocAndCacheFieldInfo();
AllocRowset();
// If late binding, still need to allocate status arrays
if (bUnbound && (m_nFields > 0 || m_nParams > 0))
AllocStatusArrays();
// Give derived classes a call before binding
PreBindFields();
if (m_nResultCols)
MoveNext();
// If EOF, then result set empty, so set BOF as well
m_bBOF = m_bEOF;
}
CATCH_ALL(e)
{
Close();
THROW_LAST();
}
END_CATCH_ALL
return TRUE;
}