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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@198804 c90b9560-bf6c-de11-be94-00142212c4b1
134 lines
3.5 KiB
XML
134 lines
3.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
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<refentry id="function.PDO-query">
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<refnamediv>
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<refname>PDO::query</refname>
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<refpurpose>
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Executes an SQL statement, returning a result set as a PDOStatement object
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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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<methodsynopsis>
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<type>PDOStatement</type><methodname>PDO::query</methodname>
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<methodparam><type>string</type><parameter>statement</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>PDO::query</function> executes an SQL statement in
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a single function call, returning the result set (if any) returned by the
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statement as a PDOStatement object.
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</para>
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<para>
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For a query that you need to issue multiple times, you will realize better
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performance if you prepare a PDOStatement object using
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<function>PDO::prepare</function> and issue the statement with multiple
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calls to <function>PDOStatement::execute</function>.
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</para>
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<para>
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If you do not fetch all of the data in a result set before issuing your
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next call to <function>PDO::query</function>, your call may fail. Call
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<function>PDOStatement::closeCursor</function> to release the database
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resources associated with the PDOStatement object before issuing your
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next call to <function>PDO::query</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>statement</parameter></term>
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<listitem>
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<para>
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The SQL statement to prepare and execute.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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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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<function>PDO::query</function> returns a PDOStatement object.
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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>Demonstrate PDO::query</title>
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<para>
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A nice feature of <function>PDO::query</function> is that it
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enables you to iterate over the rowset returned by a
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successfully executed SELECT statement.
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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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function getFruit($conn) {
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$sql = 'SELECT name, colour, calories FROM fruit ORDER BY name';
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foreach ($conn->query($sql) as $row) {
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print $row['NAME'] . "\t";
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print $row['COLOUR'] . "\t";
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print $row['CALORIES'] . "\n";
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}
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}
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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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apple red 150
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banana yellow 250
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kiwi brown 75
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lemon yellow 25
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orange orange 300
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pear green 150
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watermelon pink 90
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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><function>PDO::exec</function></member>
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<member><function>PDO::prepare</function></member>
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<member><function>PDOStatement::execute</function></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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