mirror of
https://github.com/postgres/postgres.git
synced 2025-06-26 12:21:12 +03:00
> Joe Conway <mail@joeconway.com> writes:
>>ISTM that "source" is worth knowing. > > Hm, possibly. Any other opinions? This version has the seven fields I proposed, including "source". Here's an example that shows why I think it's valuable: regression=# \x Expanded display is on. regression=# select * from pg_settings where name = 'enable_seqscan'; -[ RECORD 1 ]----------- name | enable_seqscan setting | on context | user vartype | bool source | default min_val | max_val | regression=# update pg_settings set setting = 'off' where name = 'enable_seqscan'; -[ RECORD 1 ]--- set_config | off regression=# select * from pg_settings where name = 'enable_seqscan'; -[ RECORD 1 ]----------- name | enable_seqscan setting | off context | user vartype | bool source | session min_val | max_val | regression=# alter user postgres set enable_seqscan to 'off'; ALTER USER (log out and then back in again) regression=# \x Expanded display is on. regression=# select * from pg_settings where name = 'enable_seqscan'; -[ RECORD 1 ]----------- name | enable_seqscan setting | off context | user vartype | bool source | user min_val | max_val | In the first case, enable_seqscan is set to its default value. After setting it to off, it is obvious that the value has been changed for the session only. In the third case, you can see that the value has been set specifically for the user. Joe Conway
This commit is contained in:
Bruce Momjian
@ -10,7 +10,7 @@
|
||||
* Written by Peter Eisentraut <peter_e@gmx.net>.
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.139 2003/07/25 20:17:56 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.140 2003/07/27 04:35:53 momjian Exp $
|
||||
*
|
||||
*--------------------------------------------------------------------
|
||||
*/
|
||||
@ -155,6 +155,47 @@ static char *timezone_string;
|
||||
static char *XactIsoLevel_string;
|
||||
|
||||
|
||||
/*
|
||||
* Used for pg_settings. Keep in sync with config_type enum above
|
||||
*/
|
||||
static char *config_type_name[] =
|
||||
{
|
||||
"bool",
|
||||
"integer",
|
||||
"real",
|
||||
"string"
|
||||
};
|
||||
|
||||
/*
|
||||
* Used for pg_settings. Keep in sync with GucContext enum in guc.h
|
||||
*/
|
||||
static char *GucContextName[] =
|
||||
{
|
||||
"internal",
|
||||
"postmaster",
|
||||
"sighup",
|
||||
"backend",
|
||||
"super-user",
|
||||
"user"
|
||||
};
|
||||
|
||||
/*
|
||||
* Used for pg_settings. Keep in sync with GucSource enum in guc.h
|
||||
*/
|
||||
static char *GucSourceName[] =
|
||||
{
|
||||
"default",
|
||||
"environment variable",
|
||||
"configuration file",
|
||||
"command line",
|
||||
"database",
|
||||
"user",
|
||||
"client",
|
||||
"override",
|
||||
"session"
|
||||
};
|
||||
|
||||
|
||||
/* Macros for freeing malloc'd pointers only if appropriate to do so */
|
||||
/* Some of these tests are probably redundant, but be safe ... */
|
||||
#define SET_STRING_VARIABLE(rec, newval) \
|
||||
@ -3323,23 +3364,102 @@ GetConfigOptionByName(const char *name, const char **varname)
|
||||
* Return GUC variable value by variable number; optionally return canonical
|
||||
* form of name. Return value is palloc'd.
|
||||
*/
|
||||
char *
|
||||
GetConfigOptionByNum(int varnum, const char **varname, bool *noshow)
|
||||
void
|
||||
GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
|
||||
{
|
||||
struct config_generic *conf;
|
||||
char buffer[256];
|
||||
struct config_generic *conf;
|
||||
|
||||
/* check requested variable number valid */
|
||||
Assert((varnum >= 0) && (varnum < num_guc_variables));
|
||||
|
||||
conf = guc_variables[varnum];
|
||||
|
||||
if (varname)
|
||||
*varname = conf->name;
|
||||
|
||||
if (noshow)
|
||||
*noshow = (conf->flags & GUC_NO_SHOW_ALL) ? true : false;
|
||||
|
||||
return _ShowOption(conf);
|
||||
/* first get the generic attributes */
|
||||
|
||||
/* name */
|
||||
values[0] = conf->name;
|
||||
|
||||
/* setting : use _ShowOption in order to avoid duplicating the logic */
|
||||
values[1] = _ShowOption(conf);
|
||||
|
||||
/* context */
|
||||
values[2] = GucContextName[conf->context];
|
||||
|
||||
/* vartype */
|
||||
values[3] = config_type_name[conf->vartype];
|
||||
|
||||
/* source */
|
||||
values[4] = GucSourceName[conf->source];
|
||||
|
||||
/* now get the type specifc attributes */
|
||||
switch (conf->vartype)
|
||||
{
|
||||
case PGC_BOOL:
|
||||
{
|
||||
/* min_val */
|
||||
values[5] = NULL;
|
||||
|
||||
/* max_val */
|
||||
values[6] = NULL;
|
||||
}
|
||||
break;
|
||||
|
||||
case PGC_INT:
|
||||
{
|
||||
struct config_int *lconf = (struct config_int *) conf;
|
||||
|
||||
/* min_val */
|
||||
snprintf(buffer, sizeof(buffer), "%d", lconf->min);
|
||||
values[5] = pstrdup(buffer);
|
||||
|
||||
/* max_val */
|
||||
snprintf(buffer, sizeof(buffer), "%d", lconf->max);
|
||||
values[6] = pstrdup(buffer);
|
||||
}
|
||||
break;
|
||||
|
||||
case PGC_REAL:
|
||||
{
|
||||
struct config_real *lconf = (struct config_real *) conf;
|
||||
|
||||
/* min_val */
|
||||
snprintf(buffer, sizeof(buffer), "%g", lconf->min);
|
||||
values[5] = pstrdup(buffer);
|
||||
|
||||
/* max_val */
|
||||
snprintf(buffer, sizeof(buffer), "%g", lconf->max);
|
||||
values[6] = pstrdup(buffer);
|
||||
}
|
||||
break;
|
||||
|
||||
case PGC_STRING:
|
||||
{
|
||||
/* min_val */
|
||||
values[5] = NULL;
|
||||
|
||||
/* max_val */
|
||||
values[6] = NULL;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
{
|
||||
/*
|
||||
* should never get here, but in case we do, set 'em to NULL
|
||||
*/
|
||||
|
||||
/* min_val */
|
||||
values[5] = NULL;
|
||||
|
||||
/* max_val */
|
||||
values[6] = NULL;
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -3379,6 +3499,8 @@ show_config_by_name(PG_FUNCTION_ARGS)
|
||||
* show_all_settings - equiv to SHOW ALL command but implemented as
|
||||
* a Table Function.
|
||||
*/
|
||||
#define NUM_PG_SETTINGS_ATTS 7
|
||||
|
||||
Datum
|
||||
show_all_settings(PG_FUNCTION_ARGS)
|
||||
{
|
||||
@ -3402,12 +3524,25 @@ show_all_settings(PG_FUNCTION_ARGS)
|
||||
*/
|
||||
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
|
||||
|
||||
/* need a tuple descriptor representing two TEXT columns */
|
||||
tupdesc = CreateTemplateTupleDesc(2, false);
|
||||
/*
|
||||
* need a tuple descriptor representing NUM_PG_SETTINGS_ATTS columns
|
||||
* of the appropriate types
|
||||
*/
|
||||
tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "context",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "vartype",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "source",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "min_val",
|
||||
TEXTOID, -1, 0, false);
|
||||
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "max_val",
|
||||
TEXTOID, -1, 0, false);
|
||||
|
||||
/* allocate a slot for a tuple with this tupdesc */
|
||||
slot = TupleDescGetSlot(tupdesc);
|
||||
@ -3438,9 +3573,7 @@ show_all_settings(PG_FUNCTION_ARGS)
|
||||
|
||||
if (call_cntr < max_calls) /* do when there is more left to send */
|
||||
{
|
||||
char *values[2];
|
||||
char *varname;
|
||||
char *varval;
|
||||
char *values[NUM_PG_SETTINGS_ATTS];
|
||||
bool noshow;
|
||||
HeapTuple tuple;
|
||||
Datum result;
|
||||
@ -3450,15 +3583,9 @@ show_all_settings(PG_FUNCTION_ARGS)
|
||||
*/
|
||||
do
|
||||
{
|
||||
varval = GetConfigOptionByNum(call_cntr,
|
||||
(const char **) &varname,
|
||||
&noshow);
|
||||
GetConfigOptionByNum(call_cntr, (const char **) values, &noshow);
|
||||
if (noshow)
|
||||
{
|
||||
/* varval is a palloc'd copy, so free it */
|
||||
if (varval != NULL)
|
||||
pfree(varval);
|
||||
|
||||
/* bump the counter and get the next config setting */
|
||||
call_cntr = ++funcctx->call_cntr;
|
||||
|
||||
@ -3468,24 +3595,12 @@ show_all_settings(PG_FUNCTION_ARGS)
|
||||
}
|
||||
} while (noshow);
|
||||
|
||||
/*
|
||||
* Prepare a values array for storage in our slot. This should be
|
||||
* an array of C strings which will be processed later by the
|
||||
* appropriate "in" functions.
|
||||
*/
|
||||
values[0] = varname;
|
||||
values[1] = varval;
|
||||
|
||||
/* build a tuple */
|
||||
tuple = BuildTupleFromCStrings(attinmeta, values);
|
||||
|
||||
/* make the tuple into a datum */
|
||||
result = TupleGetDatum(slot, tuple);
|
||||
|
||||
/* Clean up */
|
||||
if (varval != NULL)
|
||||
pfree(varval);
|
||||
|
||||
SRF_RETURN_NEXT(funcctx, result);
|
||||
}
|
||||
else
|
||||
|
||||
Reference in New Issue
Block a user