Re: ODBC connection strings - "ODBC;" prefix?

Hi, David,
Thanks for your response.

From my test, I found that this issue should be caused by SQLDriverConnect
which does not accept "ODBC;" parameters. If you observe CDatabase::Open
method, you will find that:
if (_tcsnicmp(strConnect, _afxODBCTrail, lstrlen(_afxODBCTrail)) == 0)
{
// Strip "ODBC;"
strConnect = strConnect.Right(strConnect.GetLength()
- lstrlen(_afxODBCTrail));
}

As you can see, if there is "ODBC;" in the connection string,
CDatabase::Open method will remove it; however, CDatabase::OpenEx does not
provide this function. When you add "ODBC;" to the connection string, for
instance "ODBC;DSN=MySQL2000;Database=GT;", the parameter pszConnectInput
value of ::SQLDriverConnect method will be "DSN=MySQL2000;Database=GT;" for
CDatabase::Open method; while "ODBC;DSN=MySQL2000;Database=GT;" for
CDatabase::OpenEx.
The value with "ODBC;" will fail the driver connection. You can refer to
the nResult value.
Although MFC pre-pending the "ODBC;" after the SQLDriverConnect method, it
is just for saving the OUTPUT connection string and let us know that this
is an ODBC connection. This shoud be a by design behavior for upward
compatibility and should not be a bug.

Anyway, if you use OpenEx method, there is no need to use "ODBC;" which
will cause driver connection failure. Actually there is also no need to use
"ODBC;" in the Open method now since it will be removed even if you add the
"ODBC;" in the connection string. Also, you can see that OpenEx is called
at the end of the Open method.

Appreciate your understanding on this. If you have any other questions or
concerns, please feel free to let me know.

Have a good day!

Charles Wang
Microsoft Online Community Support
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