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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<refentry id="function.maxdb-field-count">
<refnamediv>
<refname>maxdb_field_count</refname>
<refname>maxdb->field_count</refname>
<refpurpose>Returns the number of columns for the most recent query</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>int</type><methodname>maxdb_field_count</methodname>
<methodparam><type>resource</type><parameter>link</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (method):</para>
<classsynopsis>
<ooclass><classname>maxdb</classname></ooclass>
<methodsynopsis>
<type>int</type>
<methodname>field_count</methodname>
<void />
</methodsynopsis>
</classsynopsis>
<para>
Returns the number of columns for the most recent query on the connection
represented by the <parameter>link</parameter> parameter. This function
can be useful when using the <function>maxdb_store_result</function>
function to determine if the query should have produced a non-empty result
set or not without knowing the nature of the query.
</para>
</refsect1>
<refsect1>
<title>Return values</title>
<para>An integer representing the number of fields in a result set</para>
</refsect1>
<refsect1>
<title>Example</title>
<para>
<example>
<title>Object oriented style</title>
<programlisting role='php'>
<![CDATA[
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
maxdb_report (MAXDB_REPORT_OFF);
$maxdb->query("DROP TABLE friends");
maxdb_report (MAXDB_REPORT_ERROR);
$maxdb->query( "CREATE TABLE friends (id int, name varchar(20))");
$maxdb->query( "INSERT INTO friends VALUES (1,'Hartmut')");
$maxdb->query( "INSERT INTO friends VALUES (2, 'Ulf')");
if ($maxdb->field_count()) {
/* this was a select/show or describe query */
$result = $maxdb->store_result();
/* process resultset */
$row = $result->fetch_row();
/* free resultset */
$result->close();
}
/* close connection */
$maxdb->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role='php'>
<![CDATA[
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
maxdb_report (MAXDB_REPORT_OFF);
maxdb_query($link,"DROP TABLE friends");
maxdb_report (MAXDB_REPORT_ERROR);
maxdb_query($link, "CREATE TABLE friends (id int, name varchar(20))");
maxdb_query($link, "INSERT INTO friends VALUES (1,'Hartmut')");
maxdb_query($link, "INSERT INTO friends VALUES (2, 'Ulf')");
if (maxdb_field_count($link)) {
/* this was a select/show or describe query */
$result = maxdb_store_result($link);
/* process resultset */
$row = maxdb_fetch_row($result);
/* free resultset */
maxdb_free_result($result);
}
/* close connection */
maxdb_close($link);
?>
]]>
</programlisting>
</example>
</para>
<para>
The above example produces no output.
</para>
</refsect1>
</refentry>
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