postgresql/src/backend/utils/adt/misc.c

/*-------------------------------------------------------------------------
 *
 * misc.c
 *
 *
 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $PostgreSQL: pgsql/src/backend/utils/adt/misc.c,v 1.33 2004/05/21 05:08:02 tgl Exp $
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include <sys/file.h>

#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "utils/builtins.h"


/*
 * Check if data is Null
 */
Datum
nullvalue(PG_FUNCTION_ARGS)
{
	if (PG_ARGISNULL(0))
		PG_RETURN_BOOL(true);
	PG_RETURN_BOOL(false);
}

/*
 * Check if data is not Null
 */
Datum
nonnullvalue(PG_FUNCTION_ARGS)
{
	if (PG_ARGISNULL(0))
		PG_RETURN_BOOL(false);
	PG_RETURN_BOOL(true);
}

/*
 * current_database()
 *	Expose the current database to the user
 */
Datum
current_database(PG_FUNCTION_ARGS)
{
	Name		db;

	db = (Name) palloc(NAMEDATALEN);

	namestrcpy(db, get_database_name(MyDatabaseId));
	PG_RETURN_NAME(db);
}