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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<!-- NOT INCLUDED -->
<refentry id="fn_row_deref">
<refmeta>
<refentrytitle>row_deref</refentrytitle>
<refmiscinfo>object</refmiscinfo>
</refmeta>
<refnamediv>
<refname>row_deref</refname>
<refpurpose>Given an object ID or a row identity string returned by row_identity,
retrieves the actual row</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_row_deref">
<funcprototype id="fproto_row_deref">
<funcdef><function>row_deref</function></funcdef>
<paramdef>in <parameter>id </parameter>varchar</paramdef>
<paramdef>in <parameter>is_exclusive </parameter>integer</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_row_deref"><title>Description</title>
<para>
Given an object ID or a row identity string returned by row_identity,
retrieves the actual row.
</para>
<para>
id: A row identity string or object ID object.
</para>
<para>
Is_exclusive: If non-zero, the row retrieved is locked exclusively.
This is useful when intending to delete or update the row in the same transaction.
</para>
<note>
<title>Note:</title>
<para>NULL if returned if there is no row referenced. This can happen
if the identity was retrieved in a previous transaction and the
row was deleted afterwards.
</para>
</note>
<example id="ex_row_deref">
<title>Example:</title>
<programlisting>
select row_deref (row_identity (_ROW), 0) from T1;
is equivalent to
select _ROW from T1;
</programlisting>
</example>
</refsect1>
</refentry>
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