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User and database-specific session defaults for run-time configuration

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variables.  New commands ALTER DATABASE ... SET and ALTER USER ... SET.
This commit is contained in:
Peter Eisentraut
2002-03-01 22:45:19 +00:00
parent 851f766115
commit 1aac2c852a
29 changed files with 812 additions and 48 deletions
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79
src/backend/commands/dbcommands.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.83 2002/02/24 20:20:19 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/dbcommands.c,v 1.84 2002/03/01 22:45:08 petere Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,8 +32,10 @@
#include "miscadmin.h"
#include "storage/freespace.h"
#include "storage/sinval.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
@ -287,6 +289,7 @@ createdb(const char *dbname, const char *dbowner,
DirectFunctionCall1(textin, CStringGetDatum(dbpath ? dbpath : ""));
memset(new_record_nulls, ' ', sizeof(new_record_nulls));
new_record_nulls[Anum_pg_database_datconfig - 1] = 'n';
tuple = heap_formtuple(pg_database_dsc, new_record, new_record_nulls);
@ -446,6 +449,80 @@ dropdb(const char *dbname)
/*
* ALTER DATABASE name SET ...
*/
void
AlterDatabaseSet(AlterDatabaseSetStmt *stmt)
{
char *valuestr;
HeapTuple tuple,
newtuple;
Relation rel;
ScanKeyData scankey;
HeapScanDesc scan;
Datum repl_val[Natts_pg_database];
char repl_null[Natts_pg_database];
char repl_repl[Natts_pg_database];
int i;
valuestr = (stmt->value
? ((A_Const *) lfirst(stmt->value))->val.val.str
: NULL);
rel = heap_openr(DatabaseRelationName, RowExclusiveLock);
ScanKeyEntryInitialize(&scankey, 0, Anum_pg_database_datname,
F_NAMEEQ, NameGetDatum(stmt->dbname));
scan = heap_beginscan(rel, 0, SnapshotNow, 1, &scankey);
tuple = heap_getnext(scan, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "database \"%s\" does not exist", stmt->dbname);
if (!(superuser()
|| ((Form_pg_database) GETSTRUCT(tuple))->datdba == GetUserId()))
elog(ERROR, "permission denied");
for (i = 0; i < Natts_pg_database; i++)
repl_repl[i] = ' ';
repl_repl[Anum_pg_database_datconfig-1] = 'r';
if (strcmp(stmt->variable, "all")==0 && stmt->value == NULL)
/* RESET ALL */
repl_null[Anum_pg_database_datconfig-1] = 'n';
else
{
Datum datum;
bool isnull;
ArrayType *a;
repl_null[Anum_pg_database_datconfig-1] = ' ';
datum = heap_getattr(tuple, Anum_pg_database_datconfig,
RelationGetDescr(rel), &isnull);
if (valuestr)
a = GUCArrayAdd(isnull
? NULL
: (ArrayType *) pg_detoast_datum((struct varlena *)datum),
stmt->variable, valuestr);
else
a = GUCArrayDelete(isnull
? NULL
: (ArrayType *) pg_detoast_datum((struct varlena *)datum),
stmt->variable);
repl_val[Anum_pg_database_datconfig-1] = PointerGetDatum(a);
}
newtuple = heap_modifytuple(tuple, rel, repl_val, repl_null, repl_repl);
simple_heap_update(rel, &tuple->t_self, newtuple);
heap_endscan(scan);
heap_close(rel, RowExclusiveLock);
}
/*
* Helper functions
*/