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Another round of protocol changes. Backend-to-frontend messages now all

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have length words.  COPY OUT reimplemented per new protocol: it doesn't
need \. anymore, thank goodness.  COPY BINARY to/from frontend works,
at least as far as the backend is concerned --- libpq's PQgetline API
is not up to snuff, and will have to be replaced with something that is
null-safe.  libpq uses message length words for performance improvement
(no cycles wasted rescanning long messages), but not yet for error
recovery.
This commit is contained in:
Tom Lane
2003-04-22 00:08:07 +00:00
parent ca944bd2d4
commit 5ed27e35f3
22 changed files with 782 additions and 357 deletions
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16
src/backend/tcop/dest.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/dest.c,v 1.52 2003/04/19 00:02:29 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/dest.c,v 1.53 2003/04/22 00:08:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -141,7 +141,9 @@ EndCommand(const char *commandTag, CommandDest dest)
* libpq's crufty way of determining whether a multiple-command
* query string is done. In protocol 2.0 it's probably not really
* necessary to distinguish empty queries anymore, but we still do it
* for backwards compatibility with 1.0.
* for backwards compatibility with 1.0. In protocol 3.0 it has some
* use again, since it ensures that there will be a recognizable end
* to the response to an Execute message.
* ----------------
*/
void
@@ -153,9 +155,13 @@ NullCommand(CommandDest dest)
case Remote:
/*
* tell the fe that we saw an empty query string
* tell the fe that we saw an empty query string. In protocols
* before 3.0 this has a useless empty-string message body.
*/
pq_putbytes("I", 2); /* note we send I and \0 */
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
pq_putemptymessage('I');
else
pq_puttextmessage('I', "");
break;
case Debug:
@@ -184,7 +190,7 @@ ReadyForQuery(CommandDest dest)
case RemoteInternal:
case Remote:
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 2)
pq_putbytes("Z", 1);
pq_putemptymessage('Z');
/* Flush output at end of cycle in any case. */
pq_flush();
break;