doc-fr/reference/pgsql/functions/pg-lo-seek.xml at master · php/doc-fr · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: yannick Status: ready -->
<!-- Reviewed: no -->
<refentry xml:id="function.pg-lo-seek" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_lo_seek</refname>
  <refpurpose>
   Modifie la position dans un objet de grande taille
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>pg_lo_seek</methodname>
   <methodparam><type>PgSql\Lob</type><parameter>lob</parameter></methodparam>
   <methodparam><type>int</type><parameter>offset</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>whence</parameter><initializer><constant>SEEK_CUR</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_lo_seek</function> modifie la position du pointeur dans
   l'instance <classname>PgSql\Lob</classname>.
  </para>
  <para>
   Pour utiliser un objet de grande taille (<literal>lo</literal>), il est
   nécessaire de le faire dans une transaction.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>lob</parameter></term>
     <listitem>
      &pgsql.parameter.lob;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>offset</parameter></term>
     <listitem>
      <para>
       Le nombre d'octets de déplacement.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>whence</parameter></term>
     <listitem>
      <para>
       Une de ces constantes <constant>PGSQL_SEEK_SET</constant> (positionne à
       partir du début de l'objet),
       <constant>PGSQL_SEEK_CUR</constant> (positionne à partir de la position
       courante)
       ou <constant>PGSQL_SEEK_END</constant> (positionne à partir de la fin
       de l'objet).
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.lob-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Exemple avec <function>pg_lo_seek</function></title>
    <programlisting role="php">
<![CDATA[
<?php
   $doc_oid = 189762345;
   $database = pg_connect("dbname=jacarta");
   pg_query($database, "begin");
   $handle = pg_lo_open($database, $doc_oid, "r");
   // Saute les 50000 premiers octets
   pg_lo_seek($handle, 50000, PGSQL_SEEK_SET);
   // Lit les prochains 10000 octets
   $data = pg_lo_read($handle, 10000);
   pg_query($database, "commit");
   echo $data;
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_lo_tell</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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