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Adjust lo_open() so that specifying INV_READ without INV_WRITE creates

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a descriptor that uses the current transaction snapshot, rather than
SnapshotNow as it did before (and still does if INV_WRITE is set).
This means pg_dump will now dump a consistent snapshot of large object
contents, as it never could do before.  Also, add a lo_create() function
that is similar to lo_creat() but allows the desired OID of the large
object to be specified.  This will simplify pg_restore considerably
(but I'll fix that in a separate commit).
This commit is contained in:
Tom Lane
2005-06-13 02:26:53 +00:00
parent f52a34229b
commit a2fb7b8a1f
11 changed files with 265 additions and 96 deletions
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3
src/interfaces/libpq/libpq-int.h
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@@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.102 2005/06/12 00:00:21 neilc Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.103 2005/06/13 02:26:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -229,6 +229,7 @@ typedef struct pgLobjfuncs
Oid fn_lo_open; /* OID of backend function lo_open */
Oid fn_lo_close; /* OID of backend function lo_close */
Oid fn_lo_creat; /* OID of backend function lo_creat */
Oid fn_lo_create; /* OID of backend function lo_create */
Oid fn_lo_unlink; /* OID of backend function lo_unlink */
Oid fn_lo_lseek; /* OID of backend function lo_lseek */
Oid fn_lo_tell; /* OID of backend function lo_tell */