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:tmm8@xxxxxxxxxx] Sent: Viernes, 27 de Abril de 2007 10:56 a.m. To: php-db@xxxxxxxxxxxxx Subject: 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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