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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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5
src/include/commands/variable.h
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@ -2,7 +2,7 @@
* variable.h
* Routines for handling specialized SET variables.
*
* $Id: variable.h,v 1.19 2002/09/04 20:31:42 momjian Exp $
* $Id: variable.h,v 1.20 2003/04/25 19:45:09 tgl Exp $
*
*/
#ifndef VARIABLE_H
@ -22,9 +22,6 @@ extern bool assign_random_seed(double value,
extern const char *show_random_seed(void);
extern const char *assign_client_encoding(const char *value,
bool doit, bool interactive);
extern const char *assign_server_encoding(const char *value,
bool doit, bool interactive);
extern const char *show_server_encoding(void);
extern const char *assign_session_authorization(const char *value,
bool doit, bool interactive);
extern const char *show_session_authorization(void);