<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- splitted from ./en/functions/ifx.xml, last change in rev 1.2 -->
  <refentry id="function.ifx-affected-rows">
   <refnamediv>
    <refname>ifx_affected_rows</refname>
    <refpurpose>Get number of rows affected by a query</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>ifx_affected_rows</methodname>
      <methodparam><type>int</type><parameter>result_id</parameter></methodparam>
     </methodsynopsis>
    <para>
     <parameter>result_id</parameter> is a valid result id returned by
     <function>ifx_query</function> or
     <function>ifx_prepare</function>. 
    </para>
    <para> 
     Returns the number of rows affected by a query associated with
     <parameter>result_id</parameter>.  
    </para>
    <para> 
     For inserts, updates and deletes the number is the real number
     (sqlerrd[2]) of affected rows. For selects it is an estimate
     (sqlerrd[0]). Don't rely on it. The database server can never
     return the actual number of rows that will be returned by a
     SELECT because it has not even begun fetching them at this stage
     (just after the "PREPARE" when the optimizer has determined the
     query plan).
    </para>
    <para> 
     Useful after <function>ifx_prepare</function> to limit queries to
     reasonable result sets.
    </para>
    <para>
     <example>
      <title>Informix affected rows</title>
      <programlisting role="php">
<![CDATA[
<?php
$rid = ifx_prepare("select * from emp 
                     where name like " . $name, $connid);
if (! $rid) {
    /* ... error ... */
}
$rowcount = ifx_affected_rows($rid);
if ($rowcount > 1000) {
    printf ("Too many rows in result set (%d)\n<br />", $rowcount);
    die ("Please restrict your query<br />\n");
}
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>ifx_num_rows</function>.
    </para>
   </refsect1>
  </refentry>

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