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In the continuing saga of FE/BE protocol revisions, add reporting of

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initial values and runtime changes in selected parameters.  This gets
rid of the need for an initial 'select pg_client_encoding()' query in
libpq, bringing us back to one message transmitted in each direction
for a standard connection startup.  To allow server version to be sent
using the same GUC mechanism that handles other parameters, invent the
concept of a never-settable GUC parameter: you can 'show server_version'
but it's not settable by any GUC input source.  Create 'lc_collate' and
'lc_ctype' never-settable parameters so that people can find out these
settings without need for pg_controldata.  (These side ideas were all
discussed some time ago in pgsql-hackers, but not yet implemented.)
This commit is contained in:
Tom Lane
2003-04-25 19:45:10 +00:00
parent a2190c9eb6
commit 9cbaf72177
13 changed files with 412 additions and 478 deletions
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18
src/backend/commands/variable.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.73 2003/02/01 18:31:28 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.74 2003/04/25 19:45:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -500,22 +500,6 @@ assign_client_encoding(const char *value, bool doit, bool interactive)
}
const char *
assign_server_encoding(const char *value, bool doit, bool interactive)
{
if (interactive)
elog(ERROR, "SET SERVER_ENCODING is not supported");
/* Pretend never to fail in noninteractive case */
return value;
}
const char *
show_server_encoding(void)
{
return GetDatabaseEncodingName();
}
/*
* SET SESSION AUTHORIZATION
*