RE: [PHP-DB] handling a SELECT that returns nothing
The mysql_query function executes a query againts a DBM and just that, it
delivers the query to the DBM, if the DBM can execute the query, it returns
a positive integer, if the DBM can not execute the query, it returns 0 or
false, can't remember exactly right now.
So, it will return a positive integer no matter the query found any records
at all, so you must use mysql_num_rows() in order to find out how many
records the query returned.
-Original Message-
From: Tim McGeary [mailto:[EMAIL PROTECTED]
Sent: Viernes, 27 de Abril de 2007 10:56 a.m.
To: php-db@lists.php.net
Subject: [PHP-DB] handling a SELECT that returns nothing
I am writing a web php application that is processing a request form.
There are multiple times when I need to check if a record exists (i.e.
user record) and if so, check the inputted data against the data already
in the database and confirm whether the inputted data should update the
database.
I am getting stuck in my check of whether a record yet exists. I
thought that $result in the code snippet below would be empty, so I
thought I could use the empty() function in an if conditional. But a
later conditional on the returned result of 0 never happened, so I
echoed the $result of the mysql_query.
I have a completely empty database and my initial test should load my
new record, but I am finding that the $result is being filled with
Resource id #4
from the mysql_query. Why? What does that mean? Why wouldn't it be
empty? And more importantly, how do I this check properly?
Thanks,
Tim
?php
function record_exist($select_value, $search_value, $table, $field) {
$query = SELECT $select_value FROM $table WHERE $field =
'{$search_value}';
$result = mysql_query(SELECT $select_value FROM $table WHERE
$field='{$search_value}') or die(mysql_error());
echo $result.br;
if (empty($result)) {
return 0;
}
else {
return $result;
}
}
?
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RE: [PHP-DB] handling a SELECT that returns nothing
The mysql_query function executes a query againts a DBM and just that, it delivers the query to the DBM, if the DBM can execute the query, it returns a positive integer, if the DBM can not execute the query, it returns 0 or false, can't remember exactly right now. So, it will return a positive integer no matter the query found any records at all, so you must use mysql_num_rows() in order to find out how many records the query returned. MIGUEL GUIRAO AGUILERA Logistica R8 - Telcel Tel: (999) 960.7994 Este mensaje es exclusivamente para el uso de la persona o entidad a quien esta dirigido; contiene informacion estrictamente confidencial y legalmente protegida, cuya divulgacion es sancionada por la ley. Si el lector de este mensaje no es a quien esta dirigido, ni se trata del empleado o agente responsable de esta informacion, se le notifica por medio del presente, que su reproduccion y distribucion, esta estrictamente prohibida. Si Usted recibio este comunicado por error, favor de notificarlo inmediatamente al remitente y destruir el mensaje. Todas las opiniones contenidas en este mail son propias del autor del mensaje y no necesariamente coinciden con las de Radiomovil Dipsa, S.A. de C.V. o alguna de sus empresas controladas, controladoras, afiliadas y subsidiarias. Este mensaje intencionalmente no contiene acentos. This message is for the sole use of the person or entity to whom it is being sent. Therefore, it contains strictly confidential and legally protected material whose disclosure is subject to penalty by law. If the person reading this message is not the one to whom it is being sent and/or is not an employee or the responsible agent for this information, this person is herein notified that any unauthorized dissemination, distribution or copying of the materials included in this facsimile is strictly prohibited. If you received this document by mistake please notify immediately to the subscriber and destroy the message. Any opinions contained in this e-mail are those of the author of the message and do not necessarily coincide with those of Radiomovil Dipsa, S.A. de C.V. or any of its control, controlled, affiliates and subsidiaries companies. No part of this message or attachments may be used or reproduced in any manner whatsoever. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] handling a SELECT that returns nothing
Thanks!
Tim
Miguel Guirao wrote:
The mysql_query function executes a query againts a DBM and just that, it
delivers the query to the DBM, if the DBM can execute the query, it returns
a positive integer, if the DBM can not execute the query, it returns 0 or
false, can't remember exactly right now.
So, it will return a positive integer no matter the query found any records
at all, so you must use mysql_num_rows() in order to find out how many
records the query returned.
-Original Message-
From: Tim McGeary [mailto:[EMAIL PROTECTED]
Sent: Viernes, 27 de Abril de 2007 10:56 a.m.
To: php-db@lists.php.net
Subject: [PHP-DB] handling a SELECT that returns nothing
I am writing a web php application that is processing a request form.
There are multiple times when I need to check if a record exists (i.e.
user record) and if so, check the inputted data against the data already
in the database and confirm whether the inputted data should update the
database.
I am getting stuck in my check of whether a record yet exists. I
thought that $result in the code snippet below would be empty, so I
thought I could use the empty() function in an if conditional. But a
later conditional on the returned result of 0 never happened, so I
echoed the $result of the mysql_query.
I have a completely empty database and my initial test should load my
new record, but I am finding that the $result is being filled with
Resource id #4
from the mysql_query. Why? What does that mean? Why wouldn't it be
empty? And more importantly, how do I this check properly?
Thanks,
Tim
?php
function record_exist($select_value, $search_value, $table, $field) {
$query = SELECT $select_value FROM $table WHERE $field =
'{$search_value}';
$result = mysql_query(SELECT $select_value FROM $table WHERE
$field='{$search_value}') or die(mysql_error());
echo $result.br;
if (empty($result)) {
return 0;
}
else {
return $result;
}
}
?
Este mensaje es exclusivamente para el uso de la persona o entidad a quien esta
dirigido; contiene informacion estrictamente confidencial y legalmente
protegida, cuya divulgacion es sancionada por la ley. Si el lector de este
mensaje no es a quien esta dirigido, ni se trata del empleado o agente
responsable de esta informacion, se le notifica por medio del presente, que su
reproduccion y distribucion, esta estrictamente prohibida. Si Usted recibio
este comunicado por error, favor de notificarlo inmediatamente al remitente y
destruir el mensaje. Todas las opiniones contenidas en este mail son propias
del autor del mensaje y no necesariamente coinciden con las de Radiomovil
Dipsa, S.A. de C.V. o alguna de sus empresas controladas, controladoras,
afiliadas y subsidiarias. Este mensaje intencionalmente no contiene acentos.
This message is for the sole use of the person or entity to whom it is being
sent. Therefore, it contains strictly confidential and legally protected
material whose disclosure is subject to penalty by law. If the person reading
this message is not the one to whom it is being sent and/or is not an employee
or the responsible agent for this information, this person is herein notified
that any unauthorized dissemination, distribution or copying of the materials
included in this facsimile is strictly prohibited. If you received this
document by mistake please notify immediately to the subscriber and destroy
the message. Any opinions contained in this e-mail are those of the author of
the message and do not necessarily coincide with those of Radiomovil Dipsa,
S.A. de C.V. or any of its control, controlled, affiliates and subsidiaries
companies. No part of this message or attachments may be used or reproduced in
any manner whatsoever.
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