Hi,
If i understand well, mysql_fetch_row() work fine but if you add
mysql_data_seek() the "row" is NULL.
...you use pointers when declare variables ?In my pre-previuos e-mail i fill
what (i considered) it's not was OK.
MYSQL_RES *MResult;
MYSQL_ROW *row;
MYSQL *MQuery;
instead...
MYSQL_RES *MResult;
MYSQL_ROW row;
MYSQL MQuery;
Regards,
Gelu
_____________________________________________________
G.NET SOFTWARE COMPANY
Permanent e-mail address : [EMAIL PROTECTED]
[EMAIL PROTECTED]
----- Original Message -----
From: "Chan WieVia ICM N MC MI E3 Extern"
<[EMAIL PROTECTED]>
To: "'Gelu Gogancea'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, July 10, 2002 11:42 AM
Subject: RE: C API: mysql_data_seek
> Hi Gelu,
>
> Thnx for the prompt reply.
>
> I called mysql_data_seek() once and I called it before mysql_fetch_row().
> With this, mysql_fetch_row() returns NULL row.
>
> Then I decided to check if the connection (and query) is valid by
commented
> out mysql_data_seek(). I called only mysql_fetch_row() and it returns
> non-NULL row. From the result, I know that the connection and the query
> are valid.
>
> The next thing I check is the number of rows in the MResult. I have 3
rows
> altogether. Hence, it should return me something if I set the cursor
(using
> mysql_seek_data() ) to the 2nd row and then get the row with
> mysql_fetch_row(). However, this does not work.
>
> I've checked my concept on mysql_data_seek() against the description you
> have provided in the first reply, and I do not detect any different. Hence
I
> presume the mistake was made due to some special considerations which I do
> not know. Please advice.
>
> Once again, thnx for replying.
>
> Regards,
> wv
>
>
> -----Original Message-----
> From: Gelu Gogancea [mailto:[EMAIL PROTECTED]]
> Sent: 10 July 2002 09:38
> To: Chan WieVia ICM N MC MI E3 Extern; [EMAIL PROTECTED]
> Subject: Re: C API: mysql_data_seek
>
>
> Hi,
>
> If i understand well you use twice mysql_data_seek.If you use
> mysql_data_seek() after mysql_fetch_row() the effect is NULL.
> Because mysql_data_seek() (in fact) set the cursor (if we can said like
> this...) in the MResult (MYSQL_RES) and not in the "row" (MYSQL_ROW).
>
> Regards,
>
> Gelu
> _____________________________________________________
> G.NET SOFTWARE COMPANY
>
> Permanent e-mail address : [EMAIL PROTECTED]
> [EMAIL PROTECTED]
> ----- Original Message -----
> From: "Chan WieVia ICM N MC MI E3 Extern"
> <[EMAIL PROTECTED]>
> To: "'Gelu Gogancea'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Wednesday, July 10, 2002 10:13 AM
> Subject: RE: C API: mysql_data_seek
>
>
> >
> > Hi,
> >
> > Thanks for ur reply.
> >
> > When i "commented out" the "mysql_data_seek()" function,
> "mysql_fetch_row()"
> > returns me a non-NULL value (this should be the first row from the
> MResult).
> > This results show that I've a valid connection and/or query. And when I
> > call "mysql_fetch_row()" again (retrieving the 2nd row from the MResult,
> > which is the desired row), it returns me a non-NULL value too. From
this
> > result, I know that I've not seek past the result set. However, with
the
> > addition of the "mysql_data_seek(MResult, 1)" function, a NULL value is
> > returned. And that's where I don't know how the mistake was made.
> >
> > Please advice and thanks.
> >
> > wv
> >
> >
> > -----Original Message-----
> > From: Gelu Gogancea [mailto:[EMAIL PROTECTED]]
> > Sent: 09 July 2002 23:03
> > To: Chan WieVia ICM N MC MI E3 Extern; [EMAIL PROTECTED]
> > Subject: Re: C API: mysql_data_seek
> >
> >
> > Hi,
> >
> > It's ok but you must retrieve data from "row".
> > int sql_result;x,i;
> > MYSQL_RES *MResult;
> > MYSQL_ROW *row;
> > MYSQL *MQuery;
> > char SQLQuery[];
> >
> > sprintf( SQLQuery, "SELECT * FROM Profile" );
> > sql_result = mysql_query(SQLQuery);
> > MResult = mysql_store_result(MQuery); //mysql_store_result return
> in
> > MResult not in MQuery (here was :...mysql_store_result(&MQuery))
> > mysql_data_seek(MResult, 1); //it's ok here...i suppose you whish to
> > retrieve data from 2-nd "row"....
> >
> > row = mysql_fetch_row( MResult) ; // if you have a valid
connection(or
> > query) mysql_fetch_row should return non NULL value.
> >
> > i = mysql_num_fields(MResult) ;
> > for ( x = 0 ; x < i ; x++ )
> > {
> > printf("Data from MYSQL_ROW : %s \n",row[x]);
> > }
> > mysql_free_result( res ) ;
> >
> > I hope it's help.
> > Regards,
> >
> > Gelu
> > _____________________________________________________
> > G.NET SOFTWARE COMPANY
> >
> > Permanent e-mail address : [EMAIL PROTECTED]
> > [EMAIL PROTECTED]
> > ----- Original Message -----
> > From: "Chan WieVia ICM N MC MI E3 Extern"
> > <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Tuesday, July 09, 2002 9:29 PM
> > Subject: C API: mysql_data_seek
> >
> >
> > >
> > > Hi,
> > >
> > > I'm using the MySQL built-in C function, mysql_data_seek, for
accessing
> a
> > > particular row from the Result (MYSQL_RES) returned by
> mysql_store_result.
> > >
> > > int sql_result;
> > > MYSQL_RES *MResult;
> > > MYSQL_ROW row;
> > > MYSQL MQuery;
> > > char SQLQuery[];
> > >
> > > sprintf( SQLQuery, "SELECT * FROM Profile" );
> > > sql_result = mysql_query(SQLQuery);
> > > MResult = mysql_store_result(&MQuery);
> > > mysql_data_seek(MResult, 1);
> > > row = mysql_fetch_row(MResult);
> > >
> > > However, "row" returns NULL. I wonder if I've made any mistake in the
> > > process. Can someone please help to check? In addition, is there any
> > > special considerations when using this function?
> > >
> > > Thanks in advance.
> > >
> > > wv
> > >
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
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> >
>
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