Fix ancient error in large objects usage example: overwrite() subroutine

was opening with INV_READ flag and then writing.  Prior to 8.1 the backend
did not reject this, but now it does.

diff --git a/doc/src/sgml/lobj.sgml b/doc/src/sgml/lobj.sgml
index 98516082c971bbc18e73c3e79e1c6733f2d225fa..e2f98fb66549cb5f916da1e4a3c1829426eb80fd 100644 (file)
--- a/doc/src/sgml/lobj.sgml
+++ b/doc/src/sgml/lobj.sgml
@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/lobj.sgml,v 1.37 2005/06/13 02:26:46 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/lobj.sgml,v 1.38 2006/03/02 21:49:09 tgl Exp $
 -->
 
  <chapter id="largeObjects">
@@ -527,7 +527,7 @@ overwrite(PGconn *conn, Oid lobjId, int start, int len)
     int         nwritten;
     int         i;
 
-    lobj_fd = lo_open(conn, lobjId, INV_READ);
+    lobj_fd = lo_open(conn, lobjId, INV_WRITE);
     if (lobj_fd &lt; 0)
     {
         fprintf(stderr, &quot;can't open large object %d\n&quot;,
@@ -553,7 +553,8 @@ overwrite(PGconn *conn, Oid lobjId, int start, int len)
 }
 
 /*
- * exportFile *    export large object &quot;lobjOid&quot; to file &quot;out_filename&quot;
+ * exportFile
+ *    export large object &quot;lobjOid&quot; to file &quot;out_filename&quot;
  *
  */
 void
@@ -566,7 +567,7 @@ exportFile(PGconn *conn, Oid lobjId, char *filename)
     int         fd;
 
     /*
-     * create an inversion &quot;object&quot;
+     * open the large object
      */
     lobj_fd = lo_open(conn, lobjId, INV_READ);
     if (lobj_fd &lt; 0)
@@ -586,7 +587,7 @@ exportFile(PGconn *conn, Oid lobjId, char *filename)
     }
 
     /*
-     * read in from the Unix file and write to the inversion file
+     * read in from the inversion file and write to the Unix file
      */
     while ((nbytes = lo_read(conn, lobj_fd, buf, BUFSIZE)) &gt; 0)
     {

diff --git a/src/test/examples/testlo.c b/src/test/examples/testlo.c
index 83b4813eae4ed2149a5766da1d679af38abc786d..ae193352d10c7d0e6eb6e6483ce34abaffea7202 100644 (file)
--- a/src/test/examples/testlo.c
+++ b/src/test/examples/testlo.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/test/examples/testlo.c,v 1.25 2004/12/31 22:03:58 pgsql Exp $
+ *       $PostgreSQL: pgsql/src/test/examples/testlo.c,v 1.26 2006/03/02 21:49:09 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -113,7 +113,7 @@ overwrite(PGconn *conn, Oid lobjId, int start, int len)
        int                     nwritten;
        int                     i;
 
-       lobj_fd = lo_open(conn, lobjId, INV_READ);
+       lobj_fd = lo_open(conn, lobjId, INV_WRITE);
        if (lobj_fd < 0)
                fprintf(stderr, "can't open large object %u", lobjId);
 
@@ -156,7 +156,7 @@ exportFile(PGconn *conn, Oid lobjId, char *filename)
        int                     fd;
 
        /*
-        * create an inversion "object"
+        * open the large object
         */
        lobj_fd = lo_open(conn, lobjId, INV_READ);
        if (lobj_fd < 0)
@@ -173,7 +173,7 @@ exportFile(PGconn *conn, Oid lobjId, char *filename)
        }
 
        /*
-        * read in from the Unix file and write to the inversion file
+        * read in from the inversion file and write to the Unix file
         */
        while ((nbytes = lo_read(conn, lobj_fd, buf, BUFSIZE)) > 0)
        {