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How to generate a "non existent value"?

Thread began 6/13/2013 10:50 am by info4753 | Last modified 6/14/2013 10:15 am by Jason Byrnes | 380 views | 9 replies |

info4753

How to generate a "non existent value"?

I'm working on a validation that compares a POST variable (param) from a form with database values in order to avoid double entries. (it's a room reservation application where the user can book a room for the morning (value 1 for DAUERID), afternoon(2) or the whole day (3) (you can't book a morning if the whole day is already taken). The validation works as long as there is a value for the DAUERID in the table reservation table but the select statement returns no value (from the recordset) if there is no DAUERID value for the parameter to compare. So the validation fails. Here is the select statement:

SELECT DAUERID, ( CASE
WHEN param = 1 AND DAUERID = 1 THEN 1
WHEN param = 1 AND DAUERID = 3 THEN 1
WHEN param = 1 AND DAUERID = 2 THEN 0
WHEN param = 2 AND DAUERID = 1 THEN 0
WHEN param = 2 AND DAUERID = 3 THEN 1
WHEN param = 2 AND DAUERID = 2 THEN 1
WHEN param = 3 AND DAUERID = 1 THEN 1
WHEN param = 3 AND DAUERID = 2 THEN 1
WHEN param = 3 AND DAUERID = 3 THEN 1
ELSE 0
END) AS result
FROM res_reservationen

It looks like ELSE 0 is not working, means result is empty. Any ideas how to fix this problem? Thanks in advance!

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Jason ByrnesWebAssist

the recordset looks correct, i don't think that is the problem.

Send a copy of the page please so i can see the code in context.

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info4753

Thanks Jason.

There are two cases that I need to cover in the validation:

1. result is not getting a value so I need to validate agains an empty recordset
2. result gets a value so I need the validate against -1,0 range

I guess I need a "OR" between the two validations. Is this possible? Here are the two validations:

<?php
if (isset($_POST["InfraparkReservation_submit"]) || isset($_POST["InfraparkReservation_submit_x"])) {
$WAFV_Redirect = "res_formular1.php?ERROR=6";
$_SESSION['WAVT_resformular2_310_Errors'] = "";
if ($WAFV_Redirect == "") {
$WAFV_Redirect = $_SERVER["PHP_SELF"];
}
$WAFV_Errors = "";
$WAFV_Errors .= WAValidateNM($row_rsReservationenCheck['resultat'] . "",-1,0,"",",.",true,1);

if ($WAFV_Errors != "") {
PostResult($WAFV_Redirect,$WAFV_Errors,"resformular2_310");
}
}
?>
<?php
if (isset($_POST["InfraparkReservation_submit"]) || isset($_POST["InfraparkReservation_submit_x"])) {
$WAFV_Redirect = "res_formular1.php?ERROR=6";
$_SESSION['WAVT_resformular2_956_Errors'] = "";
if ($WAFV_Redirect == "") {
$WAFV_Redirect = $_SERVER["PHP_SELF"];
}
$WAFV_Errors = "";
$WAFV_Errors .= WAValidateNM($totalRows_rsReservationenCheck . "",-1,0,"",",.",true,2);

if ($WAFV_Errors != "") {
PostResult($WAFV_Redirect,$WAFV_Errors,"resformular2_956");
}
}
?>

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Jason ByrnesWebAssist

i dont think i understand what you are trying to accomplish.

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info4753

I have a room reservation system where you can select the room and the time you use the room. The time is dived into morning, afternoon and the whole day. I did this by using DAUERID with 1 (morning), 2(afternoon) and 3(day) values.

Now the problem is that if the whole day is already taken and another customer want's to book the room only for the morning, I have the DAUERID = 1 from the form that has to be validated against a DAUERID of 1 in the reservation table but also for a DAUERID of 3 in the reservation table.

So what I did is this CASE szenario to generate a value (0 or 1) for "result" that helps me to validate available entries in the reservation table. But if there is no reservation for that day in the reservation atble, the recordset returns empty and therefore no 0/1 values.

What I need is a validation like "if return is 0 OR the recordset is empty, accept booking".

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Jason ByrnesWebAssist

see private message:

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info4753

see private message

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Jason ByrnesWebAssist

Originally Said By: info4753
  see private message  
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info4753

It looks like I've fixed the problem.

The Selcet/case Statement was correct, but I had a wrong declared POST parameter in the recordset filter. The empty recordset case has been cover by "if recordset is not empty" condition.

Thanks for your help, support from WA is really great and I'm looking forward to the next versions of your software.

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Jason ByrnesWebAssist

Ok, glad to hear it is working.

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