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https://github.com/sigmasternchen/php-doc-en
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c030e2adf7
- All id attributes are now xml:id - Add docbook namespace to all root elements - Replace <ulink /> with <link xlink:href /> - Minor markup fixes here and there git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@238160 c90b9560-bf6c-de11-be94-00142212c4b1
117 lines
3.2 KiB
XML
117 lines
3.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<refentry xml:id="function.PDOStatement-columnCount" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>PDOStatement->columnCount()</refname>
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<refpurpose>
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Returns the number of columns in the result set
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<classsynopsis>
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<ooclass><classname>PDOStatement</classname></ooclass>
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<methodsynopsis>
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<type>int</type><methodname>columnCount</methodname>
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<void/>
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</methodsynopsis>
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</classsynopsis>
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<para>
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Use <xref linkend="function.PDOStatement-columnCount" /> to return the number
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of columns in the result set represented by the PDOStatement object.
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</para>
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<para>
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If the PDOStatement object was returned from <xref linkend="function.PDO-query" />,
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the column count is immediately available.
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</para>
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<para>
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If the PDOStatement object was returned from
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<xref linkend="function.PDO-prepare" />, an accurate column count will not be
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available until you invoke <xref linkend="function.PDOStatement-execute" />.
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns the number of columns in the result set represented by the
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PDOStatement object. If there is no result set,
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<xref linkend="function.PDOStatement-columnCount" /> returns <literal>0</literal>.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Counting columns</title>
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<para>
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This example demonstrates how <xref linkend="function.PDOStatement-columnCount" />
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operates with and without a result set.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
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$sth = $dbh->prepare("SELECT name, colour FROM fruit");
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/* Count the number of columns in the (non-existent) result set */
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$colcount = $sth->columnCount();
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print("Before execute(), result set has $colcount columns (should be 0)\n");
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$sth->execute();
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/* Count the number of columns in the result set */
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$colcount = $sth->columnCount();
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print("After execute(), result set has $colcount columns (should be 2)\n");
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Before execute(), result set has 0 columns (should be 0)
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After execute(), result set has 2 columns (should be 2)
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="function.PDO-prepare" /></member>
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<member><xref linkend="function.PDOStatement-execute" /></member>
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<member><xref linkend="function.PDOStatement-rowCount" /></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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