ADO OLE MFC

>>?If I want to enhance my skill set, should I look into ADO or OLE under VC++ 6.0.
Probably OLEDB since it is the coming wave.  But you will find more examples in MDSN and elsewhere for ADO.  Both are infinitely harder to use than CRecordset objects.

>>?Are there wizards in VC++ 6.0 that help with
>> integerating ADO such as with CRecordset class or is it
>> all straight coding.
All straight coding, and not much of it is easy.  If you use CRecordset, the tne ClassWizard makes named variables for each field of each table.  Change the table and the ClassWizard can update your object with a few clicks.

If you use ADO or OLEDB, you will be digging around all through your code to locate the changed spelling of the table/field name.  And the error won't occur unti runtime (then the data provider says "I've never heard of that field" and rejects the whole query.)

-- Dan

Incidently, here is the best code sample for ADO access that I've ever seen.  It is PERFECT because it does the bare minimum:

#include <stdio.h>
#include <afxdisp.h>
#import "c:\program files\common files\system\ado\msado15.dll" rename ("EOF","adoEOF") no_namespace

#define CREATEiNSTANCE(sp,riid) { HRESULT _hr =sp .CreateInstance( __uuidof( riid ) ); \
                                  if (FAILED(_hr)) _com_issue_error(_hr); }

#define RsITEM(rs,x) rs->Fields->Item[_variant_t(x)]->Value
#define UC (char *)
struct InitOle {
    InitOle()  { ::CoInitialize(NULL); }
    ~InitOle() { ::CoUninitialize();   }
} _init_InitOle_;       // Global Instance to force load/unload of OLE

void main(){
    _RecordsetPtr   spRS;
    _ConnectionPtr  spCON;
    try{
        CREATEiNSTANCE(spCON,Connection);
        spCON->ConnectionString = L"driver={sql server};SERVER=(local);Database=pubs;UID=sa; PWD=;";
        // spCON->ConnectionString =L"DRIVER={Microsoft Access Driver (*.mdb)};DBQ=authors.MDB;DefaultDir=C:\\test;";
             
        spCON->Open( "", "", "", -1 );
        CREATEiNSTANCE(spRS,Recordset)
        spRS->PutRefActiveConnection( spCON );
        spRS->Open("select au_lname, au_fname from authors",
               vtMissing, adOpenKeyset,
            adLockBatchOptimistic, -1
          );
        while(spRS->adoEOF == false){
            printf("au_lname = %s  au_fname = %s \n",
                    UC _bstr_t(RsITEM(spRS,0L)),
                    UC _bstr_t(RsITEM(spRS,"au_fname"))
               );
            spRS->MoveNext();
        }
        spRS->Close();
        spCON->Close();
    }
    catch( _com_error &e){
        _bstr_t bstrSource(e.Source());
        _bstr_t bs =  _bstr_t(" Error: ") + _bstr_t(e.Error()) + _bstr_t(" Msg: ")
            + _bstr_t(e.ErrorMessage()) + _bstr_t(" Description: ")
            + _bstr_t(e.Description());
       
        MessageBox(0,bs,bstrSource, MB_OK);
    }          
}

-- Dan

Looks like no-one else disagrees.

When should one use ADO over the CRecordset object, since my reservations about ADO seem validated? I have seen it used in some examples on the web, but are there any compelling reasons to use it?

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