----- Original Message -----
From: "Jochem Maas" <jochem@xxxxxxxxxxxxx>
To: "C.R.Vegelin" <cr.vegelin@xxxxxxxxx>
Cc: "David Giragosian" <dgiragosian@xxxxxxxxx>; "php-general"
<php-general@xxxxxxxxxxxxx>
Sent: Friday, November 02, 2007 9:06 AM
Subject: Re: Transfer query result to another script
C.R.Vegelin wrote:
Hello David, Jim,
Thanks for your response.
Yes, I do have session_start() at the top of Report.php.
The reason for having the query on a different page than the result
is that the result may be sent to various output types / scripts.
I will change my code as follows:
Engine.php
-------------
$result = mysqli_query($connect, $myquery);
if (!$result) error ...
if (mysqli_num_rows($result) == 0) error ...
// fill $_SESSION['results'] with query result
switch ($output)
{
case "HTML": header("Location: Report.php"); break;
WRONG!!!
there is no reason to do a redirect, use an include to run code
relevant to the selected $output (and you'll have the result set available
for no extra charge).
and you can't stick resources (e.g. a resultset id) into session
and expect them to persist - the value may be there, but the resource
it pointed to is loooooong gone by the time the second script starts.
case "CSV": ...
case "XML": ...
case "PDF": ...
}
Thanks again for your advice.
Regards, Cor
----- Original Message -----
From: David Giragosian
To: C.R.Vegelin ; php-general
Sent: Thursday, November 01, 2007 5:23 PM
Subject: Re: Transfer query result to another script
On 11/1/07, C.R.Vegelin <cr.vegelin@xxxxxxxxx> wrote:
Hi All,
Q: Is it possible to transfer a query result to another script ?
For example with (fragments of) the following 2 scripts:
Engine.php
----------------
$result = mysqli_query($connect, $myquery);
if (!$result) error ...
if (mysqli_num_rows($result) == 0) error ...
$_SESSION['result'] = $result;
header("Location: Report.php");
Report.php
----------------
$result = $_SESSION['result'];
while ($row = mysqli_fetch_array($result)) ...
This last line gives "Couldn't fetch mysqli_result".
Is this because the result set is local to Engine.php ?
TIA, Cor
Cor,
Do you have session_start() at the top of Report.php?
The manual shows an example of passing a php created class object using
a session variable, with the caveat of needing to include the class
definition on each page.
It may be different for a mysql result object though.
Why do you need the query on a different page than the result?
David
Hi Jochem,
The reason for a redirect is that Report.php has functionality such as
sorting on report columns, checkboxes to make graphs etc.
Suppose the following report columns:
Country 06.Q1 06.Q2 06.Q3 06.Q4 07.Q1 07.Q2
1 Austria 1226 1211 1233 1328 1386 1362
2 Belgium 1004 1193 1008 9737 1102 1270
3 etc.
If I don't use a redirect but an include Report.php then Engine.php must be
rerun:
- every time a user wants to sort on a columns, eg. Y06.Q1
- every time a user wants to make a graph with selected rows.
Right ? I did use an include but I'm changing it because of the reasons
above.
I know it does have its price.
Regards, Cor
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