From 8436f9a0364a6a16dbf7b250597986a97c9e6f09 Mon Sep 17 00:00:00 2001
From: Tatsuo Ishii <ishii@postgresql.org>
Date: Wed, 19 Mar 2008 00:39:33 +0000
Subject: [PATCH] Add libpq new API lo_import_with_oid() which is similar to
lo_import() except that lob's oid can be specified.
---
doc/src/sgml/lobj.sgml | 24 ++++++++++++++++++++++-
src/interfaces/libpq/exports.txt | 3 ++-
src/interfaces/libpq/fe-lobj.c | 33 +++++++++++++++++++++++++++++---
src/interfaces/libpq/libpq-fe.h | 3 ++-
4 files changed, 57 insertions(+), 6 deletions(-)
diff --git a/doc/src/sgml/lobj.sgml b/doc/src/sgml/lobj.sgml
index 0c60988f259..69a21c99cf7 100644
--- a/doc/src/sgml/lobj.sgml
+++ b/doc/src/sgml/lobj.sgml
@@ -1,4 +1,4 @@
-<!-- $PostgreSQL: pgsql/doc/src/sgml/lobj.sgml,v 1.46 2007/03/14 00:15:26 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/lobj.sgml,v 1.47 2008/03/19 00:39:33 ishii Exp $ -->
<chapter id="largeObjects">
<title id="largeObjects-title">Large Objects</title>
@@ -161,6 +161,28 @@ Oid lo_import(PGconn *conn, const char *filename);
the server; so it must exist in the client file system and be readable
by the client application.
</para>
+
+ <para>
+ The function
+<synopsis>
+Oid lo_import_with_oid(PGconn *conn, const char *filename, Oid lobjId);
+</synopsis>
+ <indexterm><primary>lo_import_with_oid</></>
+ also imports a new large object. The OID to be assigned can be
+ specified by <replaceable class="parameter">lobjId</replaceable>;
+ if so, failure occurs if that OID is already in use for some large
+ object. If <replaceable class="parameter">lobjId</replaceable>
+ is <symbol>InvalidOid</symbol> (zero) then <function>lo_import_with_oid</> assigns an unused
+ OID (this is the same behavior as <function>lo_import</>).
+ The return value is the OID that was assigned to the new large object,
+ or <symbol>InvalidOid</symbol> (zero) on failure.
+ </para>
+
+ <para>
+ <function>lo_import_with_oid</> is new as of <productname>PostgreSQL</productname>
+ 8.4 and uses <function>lo_create</function> internally which is new in 8.1; if this function is run against 8.0 or before, it will
+ fail and return <symbol>InvalidOid</symbol>.
+ </para>
</sect2>
<sect2>
diff --git a/src/interfaces/libpq/exports.txt b/src/interfaces/libpq/exports.txt
index 2b7b8fe94b7..f8809f841e4 100644
--- a/src/interfaces/libpq/exports.txt
+++ b/src/interfaces/libpq/exports.txt
@@ -1,4 +1,4 @@
-# $PostgreSQL: pgsql/src/interfaces/libpq/exports.txt,v 1.18 2007/12/09 19:01:40 tgl Exp $
+# $PostgreSQL: pgsql/src/interfaces/libpq/exports.txt,v 1.19 2008/03/19 00:39:33 ishii Exp $
# Functions to be exported by libpq DLLs
PQconnectdb 1
PQsetdbLogin 2
@@ -140,3 +140,4 @@ lo_truncate 137
PQconnectionUsedPassword 138
pg_valid_server_encoding_id 139
PQconnectionNeedsPassword 140
+lo_import_with_oid 141
diff --git a/src/interfaces/libpq/fe-lobj.c b/src/interfaces/libpq/fe-lobj.c
index dfe07198711..1cf78d57d64 100644
--- a/src/interfaces/libpq/fe-lobj.c
+++ b/src/interfaces/libpq/fe-lobj.c
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/interfaces/libpq/fe-lobj.c,v 1.64 2008/01/01 19:46:00 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/fe-lobj.c,v 1.65 2008/03/19 00:39:33 ishii Exp $
*
*-------------------------------------------------------------------------
*/
@@ -41,6 +41,8 @@
static int lo_initialize(PGconn *conn);
+static Oid
+lo_import_internal(PGconn *conn, const char *filename, const Oid oid);
/*
* lo_open
@@ -483,6 +485,27 @@ lo_unlink(PGconn *conn, Oid lobjId)
Oid
lo_import(PGconn *conn, const char *filename)
+{
+ return lo_import_internal(conn, filename, InvalidOid);
+}
+
+/*
+ * lo_import_with_oid -
+ * imports a file as an (inversion) large object.
+ * large object id can be specified.
+ *
+ * returns the oid of that object upon success,
+ * returns InvalidOid upon failure
+ */
+
+Oid
+lo_import_with_oid(PGconn *conn, const char *filename, Oid lobjId)
+{
+ return lo_import_internal(conn, filename, lobjId);
+}
+
+static Oid
+lo_import_internal(PGconn *conn, const char *filename, Oid oid)
{
int fd;
int nbytes,
@@ -507,10 +530,14 @@ lo_import(PGconn *conn, const char *filename)
/*
* create an inversion object
*/
- lobjOid = lo_creat(conn, INV_READ | INV_WRITE);
+ if (oid == InvalidOid)
+ lobjOid = lo_creat(conn, INV_READ | INV_WRITE);
+ else
+ lobjOid = lo_create(conn, oid);
+
if (lobjOid == InvalidOid)
{
- /* we assume lo_creat() already set a suitable error message */
+ /* we assume lo_create() already set a suitable error message */
(void) close(fd);
return InvalidOid;
}
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index f51c6b38acd..53d79b059f6 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.141 2008/01/01 19:46:00 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.142 2008/03/19 00:39:33 ishii Exp $
*
*-------------------------------------------------------------------------
*/
@@ -495,6 +495,7 @@ extern int lo_tell(PGconn *conn, int fd);
extern int lo_truncate(PGconn *conn, int fd, size_t len);
extern int lo_unlink(PGconn *conn, Oid lobjId);
extern Oid lo_import(PGconn *conn, const char *filename);
+extern Oid lo_import_with_oid(PGconn *conn, const char *filename, Oid lobjId);
extern int lo_export(PGconn *conn, Oid lobjId, const char *filename);
/* === in fe-misc.c === */
--
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