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 > > > > > > > > > > --------------------------------------------------------------------- > > Before posting, please check: > > http://www.mysql.com/manual.php (the manual) > > http://lists.mysql.com/ (the list archive) > > > > To request this thread, e-mail <[EMAIL PROTECTED]> > > To unsubscribe, e-mail <[EMAIL PROTECTED]> > > Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php > > > > > --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
