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Add current_schema() and current_schemas() inquiry functions.

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Update has_table_privilege functions to cope with schema-qualified
names in the same way as nextval() and others.
This commit is contained in:
Tom Lane
2002-04-26 01:24:08 +00:00
parent d9375ad564
commit a309032d2f
10 changed files with 259 additions and 180 deletions
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56
src/backend/utils/adt/name.c
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@ -12,14 +12,18 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.33 2001/10/28 06:25:52 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/name.c,v 1.34 2002/04/26 01:24:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/namespace.h"
#include "miscadmin.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
/*****************************************************************************
* USER I/O ROUTINES (none) *
@ -209,7 +213,9 @@ namestrcmp(Name name, const char *str)
}
/* SQL-functions CURRENT_USER and SESSION_USER */
/*
* SQL-functions CURRENT_USER, SESSION_USER
*/
Datum
current_user(PG_FUNCTION_ARGS)
{
@ -223,6 +229,52 @@ session_user(PG_FUNCTION_ARGS)
}
/*
* SQL-functions CURRENT_SCHEMA, CURRENT_SCHEMAS
*/
Datum
current_schema(PG_FUNCTION_ARGS)
{
List *search_path = fetch_search_path();
char *nspname;
if (search_path == NIL)
PG_RETURN_NULL();
nspname = get_namespace_name((Oid) lfirsti(search_path));
PG_RETURN_DATUM(DirectFunctionCall1(namein, CStringGetDatum(nspname)));
}
Datum
current_schemas(PG_FUNCTION_ARGS)
{
List *search_path = fetch_search_path();
int nnames = length(search_path);
Datum *names;
int i;
ArrayType *array;
/* +1 here is just to avoid palloc(0) error */
names = (Datum *) palloc((nnames + 1) * sizeof(Datum));
i = 0;
while (search_path)
{
char *nspname;
nspname = get_namespace_name((Oid) lfirsti(search_path));
names[i] = DirectFunctionCall1(namein, CStringGetDatum(nspname));
i++;
search_path = lnext(search_path);
}
array = construct_array(names, nnames,
false, /* Name is not by-val */
NAMEDATALEN, /* sizeof(Name) */
'i'); /* alignment of Name */
PG_RETURN_POINTER(array);
}
/*****************************************************************************
* PRIVATE ROUTINES *
*****************************************************************************/