r1781: Large objects support for Postgresql

[clsql.git] / interfaces / postgresql / postgresql-sql.cl

diff --git a/interfaces/postgresql/postgresql-sql.cl b/interfaces/postgresql/postgresql-sql.cl
index 275ac39b360ac1358ac0f2e0effaceb7a56a2ae9..21cb247eed7b7defced65805d84835a814e59711 100644 (file)
--- a/interfaces/postgresql/postgresql-sql.cl
+++ b/interfaces/postgresql/postgresql-sql.cl
@@ -8,7 +8,7 @@
 ;;;;                Original code by Pierre R. Mai 
 ;;;; Date Started:  Feb 2002
 ;;;;
-;;;; $Id: postgresql-sql.cl,v 1.12 2002/03/29 09:37:24 kevin Exp $
+;;;; $Id: postgresql-sql.cl,v 1.13 2002/04/19 20:25:20 marc.battyani Exp $
 ;;;;
 ;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;; and Copyright (c) 1999-2001 by Pierre R. Mai
@@ -274,3 +274,56 @@
           finally
             (incf (postgresql-result-set-tuple-index result-set))
             (return list)))))
+
+;;; Large objects support (Marc B)
+
+(defmethod database-create-large-object ((database postgresql-database))
+  (lo-create (database-conn-ptr database)
+            (logior postgresql::+INV_WRITE+ postgresql::+INV_READ+)))
+
+;; (MB)the begin/commit/rollback stuff will be removed when with-transaction wil be implemented
+(defmethod database-write-large-object ( object-id (data string) (database postgresql-database))
+  (let ((ptr (database-conn-ptr database))
+       (length (length data))
+       (result nil)
+       (fd nil))
+    (unwind-protect
+       (progn 
+        (database-execute-command "begin" database)
+        (setf fd (lo-open ptr object-id postgresql::+INV_WRITE+))
+        (when (>= fd 0)
+          (when (= (lo-write ptr fd data length) length)
+            (setf result t))))
+      (progn
+       (when (and fd (>= fd 0))
+         (lo-close ptr fd))
+       (database-execute-command (if result "commit" "rollback") database)))
+    result))
+
+;; (MB) the begin/commit/rollback stuff will be removed when with-transaction wil be implemented
+(defmethod database-read-large-object (object-id (database postgresql-database))
+  (let ((ptr (database-conn-ptr database))
+       (buffer nil)
+       (result nil)
+       (length 0)
+       (fd nil))
+    (unwind-protect
+       (progn
+        (database-execute-command "begin" database)
+        (setf fd (lo-open ptr object-id postgresql::+INV_READ+))
+        (when (>= fd 0)
+          (setf length (lo-lseek ptr fd 0 2))
+          (lo-lseek ptr fd 0 0)
+          (when (> length 0)
+            (setf buffer (uffi:allocate-foreign-string length :type '(:unsigned :byte)))
+            (when (= (lo-read ptr fd buffer length) length)
+              (setf result (uffi:convert-from-foreign-string
+                            buffer :length length :null-terminated-p nil))))))
+      (progn
+       (when buffer (uffi:free-foreign-object buffer))
+       (when (and fd (>= fd 0)) (lo-close ptr fd))
+       (database-execute-command (if result "commit" "rollback") database)))
+    result))
+
+(defmethod database-delete-large-object (object-id (database postgresql-database))
+  (lo-unlink (database-conn-ptr database) object-id))