php-doc-en/reference/pgsql/functions/pg-escape-bytea.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.61 -->
<refentry xml:id='function.pg-escape-bytea' xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_escape_bytea</refname>
  <refpurpose>
   Escape a string for insertion into a bytea field
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>pg_escape_bytea</methodname>
   <methodparam choice="opt"><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_escape_bytea</function> escapes string for
   bytea datatype.  It returns escaped string.
  </para>
  <note>
   <para>
    When you <literal>SELECT</literal> a bytea type, PostgreSQL returns octal byte values
    prefixed with '\' (e.g. \032). Users are supposed to convert back to
    binary format manually.
   </para>
   <para>
    This function requires PostgreSQL 7.2 or later. With PostgreSQL
    7.2.0 and 7.2.1, bytea values must be cast when you enable
    multi-byte support. i.e. <literal>INSERT INTO test_table (image)
    VALUES ('$image_escaped'::bytea);</literal> PostgreSQL 7.2.2 or
    later does not need a cast. The exception is when the client and backend
    character encoding does not match, and there may be multi-byte
    stream error. User must then cast to bytea to avoid this error.
   </para>
  </note>
 </refsect1>

<refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      <para>
       PostgreSQL database connection resource.  When 
       <parameter>connection</parameter> is not present, the default connection 
       is used. The default connection is the last connection made by 
       <function>pg_connect</function> or <function>pg_pconnect</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       A <type>string</type> containing text or binary data to be inserted into a bytea
       column.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A <type>string</type> containing the escaped data.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.2.0</entry>
       <entry><parameter>connection</parameter> added</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_escape_bytea</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php 
  // Connect to the database
  $dbconn = pg_connect('dbname=foo');
  
  // Read in a binary file
  $data = file_get_contents('image1.jpg');
  
  // Escape the binary data
  $escaped = pg_escape_bytea($data);
  
  // Insert it into the database
  pg_query("INSERT INTO gallery (name, data) VALUES ('Pine trees', '{$escaped}')");
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_unescape_bytea</function></member>
    <member><function>pg_escape_string</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->