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Update libpq to make new features of FE/BE protocol available to

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client applications.  Some editorial work on libpq.sgml, too.
This commit is contained in:
Tom Lane
2003-06-21 21:51:35 +00:00
parent b8d601e735
commit efc3a25bb0
11 changed files with 2523 additions and 831 deletions
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1642
doc/src/sgml/libpq.sgml
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18
doc/src/sgml/lobj.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/lobj.sgml,v 1.28 2003/03/13 01:30:28 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/lobj.sgml,v 1.29 2003/06/21 21:51:33 tgl Exp $
-->
<chapter id="largeObjects">
@ -181,7 +181,8 @@ int lo_open(PGconn *conn, Oid lobjId, int mode);
<function>lo_open</function> returns a large object descriptor
for later use in <function>lo_read</function>, <function>lo_write</function>,
<function>lo_lseek</function>, <function>lo_tell</function>, and
<function>lo_close</function>.
<function>lo_close</function>. The descriptor is only valid for
the duration of the current transaction.
</para>
</sect2>
@ -256,6 +257,11 @@ int lo_close(PGconn *conn, int fd);
<function>lo_open</function>. On success, <function>lo_close</function>
returns zero. On error, the return value is negative.
</para>
<para>
Any large object descriptors that remain open at the end of a
transaction will be closed automatically.
</para>
</sect2>
<sect2>
@ -296,6 +302,14 @@ SELECT lo_export(image.raster, '/tmp/motd') FROM image
WHERE name = 'beautiful image';
</programlisting>
</para>
<para>
These functions read and write files in the server's filesystem, using the
permissions of the database's owning user. Therefore, their use is restricted
to superusers. (In contrast, the client-side import and export functions
read and write files in the client's filesystem, using the permissions of
the client program. Their use is not restricted.)
</para>
</sect1>
<sect1 id="lo-examplesect">