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226 lines
7.3 KiB
XML
226 lines
7.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<refentry xml:id="function.sesam-fetch-row" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>sesam_fetch_row</refname>
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<refpurpose>Fetch one row as an array</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>array</type><methodname>sesam_fetch_row</methodname>
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<methodparam><type>string</type><parameter>result_id</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>whence</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>offset</parameter></methodparam>
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</methodsynopsis>
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<para>
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Fetches one row of data from the result associated with the specified
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result identifier. The row is returned as an array (indexed by values
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between <literal>0</literal> and <literal>$array["count"]-1</literal>).
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Fields may be empty, so you must check for the existence of a field by
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using the <function>isset</function> function. The type of the returned
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fields depend on the respective SQL type declared for its column (see
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<link linkend="ref.sesam">SESAM overview</link> for the conversions
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applied). SESAM "multiple fields" are "inlined" and treated like a
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sequence of columns.
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</para>
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<para>
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The number of columns in the result set is returned in an associative
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array element $array["count"]. Because some of the result columns may be
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empty, the <function>count</function> function can not be used on the
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result row returned by <function>sesam_fetch_row</function>.
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</para>
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<para>
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Subsequent calls to <function>sesam_fetch_row</function> would return the
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next (or prior, or n'th next/prior, depending on the scroll attributes)
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row in the result set, or &false; if there are no more rows.
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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>result_id</parameter></term>
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<listitem>
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<para>
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A valid result id returned by <function>sesam_query</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>whence</parameter></term>
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<listitem>
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<para>
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<parameter>whence</parameter> is an optional
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parameter for a fetch operation on "scrollable" cursors, which
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can be set to the following predefined constants:
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<table>
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<title>Valid values for <parameter>"whence"</parameter> parameter</title>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>Value</entry>
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<entry>Constant</entry>
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<entry>Meaning</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>0</entry>
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<entry><constant>SESAM_SEEK_NEXT</constant></entry>
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<entry>
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read sequentially (after fetch, the internal default is set
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to <constant>SESAM_SEEK_NEXT</constant>)
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</entry>
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</row>
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<row>
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<entry>1</entry>
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<entry><constant>SESAM_SEEK_PRIOR</constant></entry>
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<entry>
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read sequentially backwards (after fetch, the internal
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default is set to <constant>SESAM_SEEK_PRIOR</constant>)
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</entry>
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</row>
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<row>
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<entry>2</entry>
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<entry><constant>SESAM_SEEK_FIRST</constant></entry>
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<entry>
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rewind to first row (after fetch, the default is set to
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<constant>SESAM_SEEK_NEXT</constant>)
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</entry>
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</row>
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<row>
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<entry>3</entry>
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<entry><constant>SESAM_SEEK_LAST</constant></entry>
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<entry>
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seek to last row (after fetch, the default is set to
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<constant>SESAM_SEEK_PRIOR</constant>)
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</entry>
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</row>
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<row>
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<entry>4</entry>
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<entry><constant>SESAM_SEEK_ABSOLUTE</constant></entry>
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<entry>
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seek to absolute row number given as
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<parameter>offset</parameter> (Zero-based. After fetch, the
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internal default is set to
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<constant>SESAM_SEEK_ABSOLUTE</constant>, and the internal
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offset value is auto-incremented)
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</entry>
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</row>
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<row>
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<entry>5</entry>
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<entry><constant>SESAM_SEEK_RELATIVE</constant></entry>
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<entry>
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seek relative to current scroll position, where
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<parameter>offset</parameter> can be a positive or negative
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offset value.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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This parameter is only valid for "scrollable" cursors.
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</para>
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<para>
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When using "scrollable" cursors, the cursor can be freely positioned
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on the result set. If the <parameter>whence</parameter> parameter is
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omitted, the global default values for the scrolling type (initialized
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to: <constant>SESAM_SEEK_NEXT</constant>, and settable by
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<function>sesam_seek_row</function>) are used. If
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<parameter>whence</parameter> is supplied, its value replaces the
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global default.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>offset</parameter></term>
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<listitem>
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<para>
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Only evaluated (and required) if <parameter>whence</parameter> is
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either <constant>SESAM_SEEK_RELATIVE</constant> or
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<constant>SESAM_SEEK_ABSOLUTE</constant>. This parameter is only
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valid for "scrollable" cursors.
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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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Returns an array that corresponds to the fetched row, or
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&false; if there are no more rows.
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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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<example>
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<title>SESAM fetch rows</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$result = sesam_query("SELECT * FROM phone\n" .
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" WHERE LASTNAME='" . strtoupper($name) . "'\n" .
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" ORDER BY FIRSTNAME", 1);
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if (!$result) {
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/* ... error ... */
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}
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// print the table in backward order
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echo "<table border=\"1\">\n";
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$row = sesam_fetch_row($result, SESAM_SEEK_LAST);
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while (is_array($row)) {
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echo "<tr>\n";
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for ($col = 0; $col < $row["count"]; ++$col) {
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echo "<td>" . htmlspecialchars($row[$col]) . "</td>\n";
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}
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echo "</tr>\n";
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// use implied SESAM_SEEK_PRIOR
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$row = sesam_fetch_row($result);
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}
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echo "</table>\n";
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sesam_free_result($result);
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?>
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]]>
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</programlisting>
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</example>
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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>sesam_fetch_array</function></member>
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<member><function>sesam_fetch_result</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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