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As discussed on several occasions previously, the new anonymous
composite type capability makes it possible to create a system view
based on a table function in a way that is hopefully palatable to
everyone. The attached patch takes advantage of this, moving
show_all_settings() from contrib/tablefunc into the backend (renamed
all_settings(). It is defined as a builtin returning type RECORD. During
initdb a system view is created to expose the same information presently
available through SHOW ALL. For example:
test=# select * from pg_settings where name like '%debug%';
name | setting
-----------------------+---------
debug_assertions | on
debug_pretty_print | off
debug_print_parse | off
debug_print_plan | off
debug_print_query | off
debug_print_rewritten | off
wal_debug | 0
(7 rows)
Additionally during initdb two rules are created which make it possible
to change settings by updating the system view -- a "virtual table" as
Tom put it. Here's an example:
Joe Conway
This commit is contained in:
Bruce Momjian
@@ -5,7 +5,7 @@
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* command, configuration file, and command line options.
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* See src/backend/utils/misc/README for more information.
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*
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* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.81 2002/08/14 23:02:59 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.82 2002/08/15 02:51:26 momjian Exp $
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*
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* Copyright 2000 by PostgreSQL Global Development Group
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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@@ -29,6 +29,7 @@
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#include "commands/vacuum.h"
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#include "executor/executor.h"
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#include "fmgr.h"
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#include "funcapi.h"
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#include "libpq/auth.h"
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#include "libpq/pqcomm.h"
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#include "mb/pg_wchar.h"
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@@ -2403,6 +2404,117 @@ show_config_by_name(PG_FUNCTION_ARGS)
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PG_RETURN_TEXT_P(result_text);
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}
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/*
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* show_all_settings - equiv to SHOW ALL command but implemented as
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* a Table Function.
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*/
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Datum
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show_all_settings(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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TupleDesc tupdesc;
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int call_cntr;
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int max_calls;
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TupleTableSlot *slot;
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AttInMetadata *attinmeta;
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/* stuff done only on the first call of the function */
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if(SRF_IS_FIRSTCALL())
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{
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/* create a function context for cross-call persistence */
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funcctx = SRF_FIRSTCALL_INIT();
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/* need a tuple descriptor representing two TEXT columns */
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tupdesc = CreateTemplateTupleDesc(2, WITHOUTOID);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
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TEXTOID, -1, 0, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
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TEXTOID, -1, 0, false);
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/* allocate a slot for a tuple with this tupdesc */
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slot = TupleDescGetSlot(tupdesc);
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/* assign slot to function context */
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funcctx->slot = slot;
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/*
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* Generate attribute metadata needed later to produce tuples from raw
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* C strings
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*/
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attinmeta = TupleDescGetAttInMetadata(tupdesc);
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funcctx->attinmeta = attinmeta;
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/* total number of tuples to be returned */
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funcctx->max_calls = GetNumConfigOptions();
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}
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/* stuff done on every call of the function */
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funcctx = SRF_PERCALL_SETUP();
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call_cntr = funcctx->call_cntr;
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max_calls = funcctx->max_calls;
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slot = funcctx->slot;
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attinmeta = funcctx->attinmeta;
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if (call_cntr < max_calls) /* do when there is more left to send */
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{
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char **values;
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char *varname;
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char *varval;
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bool noshow;
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HeapTuple tuple;
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Datum result;
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/*
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* Get the next visible GUC variable name and value
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*/
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do
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{
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varval = GetConfigOptionByNum(call_cntr, (const char **) &varname, &noshow);
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if (noshow)
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{
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/* varval is a palloc'd copy, so free it */
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if (varval != NULL)
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pfree(varval);
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/* bump the counter and get the next config setting */
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call_cntr = ++funcctx->call_cntr;
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/* make sure we haven't gone too far now */
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if (call_cntr >= max_calls)
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SRF_RETURN_DONE(funcctx);
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}
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} while (noshow);
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/*
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* Prepare a values array for storage in our slot.
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* This should be an array of C strings which will
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* be processed later by the appropriate "in" functions.
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*/
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values = (char **) palloc(2 * sizeof(char *));
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values[0] = pstrdup(varname);
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values[1] = varval; /* varval is already a palloc'd copy */
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/* build a tuple */
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tuple = BuildTupleFromCStrings(attinmeta, values);
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/* make the tuple into a datum */
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result = TupleGetDatum(slot, tuple);
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/* Clean up */
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pfree(values[0]);
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if (varval != NULL)
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pfree(values[1]);
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pfree(values);
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SRF_RETURN_NEXT(funcctx, result);
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}
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else /* do when there is no more left */
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{
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SRF_RETURN_DONE(funcctx);
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}
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}
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static char *
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_ShowOption(struct config_generic *record)
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{
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@@ -27,7 +27,7 @@
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# Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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# Portions Copyright (c) 1994, Regents of the University of California
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#
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# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.165 2002/08/08 19:39:05 tgl Exp $
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# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.166 2002/08/15 02:51:26 momjian Exp $
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#
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#-------------------------------------------------------------------------
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@@ -1015,6 +1015,21 @@ CREATE VIEW pg_stat_database AS \
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pg_stat_get_db_blocks_hit(D.oid) AS blks_hit \
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FROM pg_database D;
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CREATE VIEW pg_settings AS \
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SELECT \
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A.name, \
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A.setting \
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FROM pg_show_all_settings() AS A(name text, setting text);
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CREATE RULE pg_settings_u AS \
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ON UPDATE TO pg_settings \
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WHERE new.name = old.name DO \
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SELECT set_config(old.name, new.setting, 'f');
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CREATE RULE pg_settings_n AS \
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ON UPDATE TO pg_settings \
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DO INSTEAD NOTHING;
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EOF
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if [ "$?" -ne 0 ]; then
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exit_nicely
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pg_proc.h,v 1.253 2002/08/09 16:45:15 tgl Exp $
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* $Id: pg_proc.h,v 1.254 2002/08/15 02:51:27 momjian Exp $
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*
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* NOTES
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* The script catalog/genbki.sh reads this file and generates .bki
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@@ -2885,6 +2885,8 @@ DATA(insert OID = 2077 ( current_setting PGNSP PGUID 12 f f t f s 1 25 "25" sho
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DESCR("SHOW X as a function");
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DATA(insert OID = 2078 ( set_config PGNSP PGUID 12 f f f f v 3 25 "25 25 16" set_config_by_name - _null_ ));
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DESCR("SET X as a function");
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DATA(insert OID = 2084 ( pg_show_all_settings PGNSP PGUID 12 f f t t s 0 2249 "" show_all_settings - _null_ ));
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DESCR("SHOW ALL as a function");
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DATA(insert OID = 2079 ( pg_table_is_visible PGNSP PGUID 12 f f t f s 1 16 "26" pg_table_is_visible - _null_ ));
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DESCR("is table visible in search path?");
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: builtins.h,v 1.190 2002/08/09 16:45:16 tgl Exp $
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* $Id: builtins.h,v 1.191 2002/08/15 02:51:27 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -662,6 +662,7 @@ extern Datum quote_literal(PG_FUNCTION_ARGS);
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/* guc.c */
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extern Datum show_config_by_name(PG_FUNCTION_ARGS);
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extern Datum set_config_by_name(PG_FUNCTION_ARGS);
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extern Datum show_all_settings(PG_FUNCTION_ARGS);
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/* catalog/pg_conversion.c */
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extern Datum pg_convert3(PG_FUNCTION_ARGS);
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@@ -1269,6 +1269,7 @@ SELECT viewname, definition FROM pg_views ORDER BY viewname;
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iexit | SELECT ih.name, ih.thepath, interpt_pp(ih.thepath, r.thepath) AS exit FROM ihighway ih, ramp r WHERE (ih.thepath ## r.thepath);
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pg_indexes | SELECT n.nspname AS schemaname, c.relname AS tablename, i.relname AS indexname, pg_get_indexdef(i.oid) AS indexdef FROM (((pg_index x JOIN pg_class c ON ((c.oid = x.indrelid))) JOIN pg_class i ON ((i.oid = x.indexrelid))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE ((c.relkind = 'r'::"char") AND (i.relkind = 'i'::"char"));
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pg_rules | SELECT n.nspname AS schemaname, c.relname AS tablename, r.rulename, pg_get_ruledef(r.oid) AS definition FROM ((pg_rewrite r JOIN pg_class c ON ((c.oid = r.ev_class))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (r.rulename <> '_RETURN'::name);
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pg_settings | SELECT a.name, a.setting FROM pg_show_all_settings() a;
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pg_stat_activity | SELECT d.oid AS datid, d.datname, pg_stat_get_backend_pid(s.backendid) AS procpid, pg_stat_get_backend_userid(s.backendid) AS usesysid, u.usename, pg_stat_get_backend_activity(s.backendid) AS current_query FROM pg_database d, (SELECT pg_stat_get_backend_idset() AS backendid) s, pg_shadow u WHERE ((pg_stat_get_backend_dbid(s.backendid) = d.oid) AND (pg_stat_get_backend_userid(s.backendid) = u.usesysid));
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pg_stat_all_indexes | SELECT c.oid AS relid, i.oid AS indexrelid, n.nspname AS schemaname, c.relname, i.relname AS indexrelname, pg_stat_get_numscans(i.oid) AS idx_scan, pg_stat_get_tuples_returned(i.oid) AS idx_tup_read, pg_stat_get_tuples_fetched(i.oid) AS idx_tup_fetch FROM (((pg_class c JOIN pg_index x ON ((c.oid = x.indrelid))) JOIN pg_class i ON ((i.oid = x.indexrelid))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (c.relkind = 'r'::"char");
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pg_stat_all_tables | SELECT c.oid AS relid, n.nspname AS schemaname, c.relname, pg_stat_get_numscans(c.oid) AS seq_scan, pg_stat_get_tuples_returned(c.oid) AS seq_tup_read, sum(pg_stat_get_numscans(i.indexrelid)) AS idx_scan, sum(pg_stat_get_tuples_fetched(i.indexrelid)) AS idx_tup_fetch, pg_stat_get_tuples_inserted(c.oid) AS n_tup_ins, pg_stat_get_tuples_updated(c.oid) AS n_tup_upd, pg_stat_get_tuples_deleted(c.oid) AS n_tup_del FROM ((pg_class c LEFT JOIN pg_index i ON ((c.oid = i.indrelid))) LEFT JOIN pg_namespace n ON ((n.oid = c.relnamespace))) WHERE (c.relkind = 'r'::"char") GROUP BY c.oid, n.nspname, c.relname;
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@@ -1304,12 +1305,14 @@ SELECT viewname, definition FROM pg_views ORDER BY viewname;
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shoelace_obsolete | SELECT shoelace.sl_name, shoelace.sl_avail, shoelace.sl_color, shoelace.sl_len, shoelace.sl_unit, shoelace.sl_len_cm FROM shoelace WHERE (NOT (EXISTS (SELECT shoe.shoename FROM shoe WHERE (shoe.slcolor = shoelace.sl_color))));
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street | SELECT r.name, r.thepath, c.cname FROM ONLY road r, real_city c WHERE (c.outline ## r.thepath);
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toyemp | SELECT emp.name, emp.age, emp."location", (12 * emp.salary) AS annualsal FROM emp;
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(38 rows)
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(39 rows)
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SELECT tablename, rulename, definition FROM pg_rules
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ORDER BY tablename, rulename;
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tablename | rulename | definition
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---------------+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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pg_settings | pg_settings_n | CREATE RULE pg_settings_n AS ON UPDATE TO pg_settings DO INSTEAD NOTHING;
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pg_settings | pg_settings_u | CREATE RULE pg_settings_u AS ON UPDATE TO pg_settings WHERE (new.name = old.name) DO SELECT set_config(old.name, new.setting, 'f'::boolean) AS set_config;
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rtest_emp | rtest_emp_del | CREATE RULE rtest_emp_del AS ON DELETE TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (old.ename, "current_user"(), 'fired '::bpchar, '$0.00'::money, old.salary);
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rtest_emp | rtest_emp_ins | CREATE RULE rtest_emp_ins AS ON INSERT TO rtest_emp DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, "current_user"(), 'hired '::bpchar, new.salary, '$0.00'::money);
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rtest_emp | rtest_emp_upd | CREATE RULE rtest_emp_upd AS ON UPDATE TO rtest_emp WHERE (new.salary <> old.salary) DO INSERT INTO rtest_emplog (ename, who, "action", newsal, oldsal) VALUES (new.ename, "current_user"(), 'honored '::bpchar, new.salary, old.salary);
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@@ -1337,5 +1340,5 @@ SELECT tablename, rulename, definition FROM pg_rules
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shoelace | shoelace_upd | CREATE RULE shoelace_upd AS ON UPDATE TO shoelace DO INSTEAD UPDATE shoelace_data SET sl_name = new.sl_name, sl_avail = new.sl_avail, sl_color = new.sl_color, sl_len = new.sl_len, sl_unit = new.sl_unit WHERE (shoelace_data.sl_name = old.sl_name);
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shoelace_data | log_shoelace | CREATE RULE log_shoelace AS ON UPDATE TO shoelace_data WHERE (new.sl_avail <> old.sl_avail) DO INSERT INTO shoelace_log (sl_name, sl_avail, log_who, log_when) VALUES (new.sl_name, new.sl_avail, 'Al Bundy'::name, 'Thu Jan 01 00:00:00 1970'::timestamp without time zone);
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shoelace_ok | shoelace_ok_ins | CREATE RULE shoelace_ok_ins AS ON INSERT TO shoelace_ok DO INSTEAD UPDATE shoelace SET sl_avail = (shoelace.sl_avail + new.ok_quant) WHERE (shoelace.sl_name = new.ok_name);
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(27 rows)
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(29 rows)
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