Re: reusing MySQL results -- resetting mySQL pointer with mysql_data_seek()
| From: | Juan C. Borrero | Date: | Wed, 04 Apr 2001 20:35:53 +0000 |
| Subject: | Re: reusing MySQL results -- resetting mySQL pointer with mysql_data_seek() | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-47129@lists.php.net to get a copy of this message | ||
Nope.
Mysql_data_seek($result,0) and it is.
----- Original Message -----
From: "Daevid Vincent" <DayWalker@TheMatrix.com>
To: "Mark Roedel" <MarkRoedel@letu.edu>; "George Wright"
<GWright@mhiweb.com>; <php-general@lists.php.net>
Sent: Wednesday, April 04, 2001 3:18 PM
Subject: RE: [PHP] reusing MySQL results -- resetting mySQL pointer with
mysql_data_seek()
> Just my two cents here...
>
> I could be mistaken, but wouldn't this method hit the database twice?
>
> I would suggest you take your results the first time and store them in an
> array or multidimensional array, then you can get to any element at any
time
> further down the page.
>
> > -----Original Message-----
> > From: Mark Roedel [mailto:MarkRoedel@letu.edu]
> > Sent: Wednesday, April 04, 2001 7:52 AM
> > To: George Wright; php-general@lists.php.net
> > Subject: RE: [PHP] reusing MySQL results
> >
> >
> > > -----Original Message-----
> > > From: George Wright [mailto:GWright@mhiweb.com]
> > > Sent: Wednesday, April 04, 2001 9:35 AM
> > > To: 'php-general@lists.php.net'
> > > Subject: [PHP] reusing MySQL results
> > >
> > >
> > > Hi All,
> > >
> > > I have a page with two forms. Both forms have drop-down option
> > > lists that are populated by a the same query. The query and
> > > db connection are all done before either form is introduced
> > > (this is the select statement, mysql_pconnect(), mysql_select_db(),
> > > and mysql_query()).
> > >
> > > I am using a while loop to build the options. The loop "engine"
> > > is mysql_fetch_object(), which writes out the values inside of
> > > option tags.
> > >
> > > Everything works fine the first time around, but when I call
> > > the query result for the second time, it's as if there are no
> > > rows to return so nothing is written out. No errors are being
> > > thrown.
> >
> > Mysql_data_seek() is your friend.
> >
> > PHP has an internal pointer that it maintains as you move through your
> > result set. At the end of your mysql_fetch_object while loop, that
> > pointer is located at the end of the result set.
> >
> > Mysql_data_seek() is the means for you to "rewind" that pointer to the
> > any specified row, including the first, of the result set.
> >
> > See
> >
> > http://php.net/manual/en/function.mysql-data-seek.php
>
>
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