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Caché ObjectScript Language Reference
Version: 3.2
Platforms:
Part Number:
IS-CCE-5-3.2A-CP-B
Print History:
Creation Date: October 9, 1997
Revision Date: December 22, 1999
Caché for Windows 95 & 98
Caché for Windows NT
Caché for OpenVMS VAX
Caché for OpenVMS Alpha
Caché for UNIX
Caché ObjectScript Language Reference
Copyright @ 1999 InterSystems Corporation
All Rights Reserved
NOTICE
PROPRIETARY— CONFIDENTIAL
This document contains trade secret and confidential information which is the property of InterSystems Corpo-
ration, One Memorial Drive, Cambridge, MA 02142, or its affiliates, and is furnished for the sole purpose of the
operation and maintenance of the products of InterSystems Corporation. No part of this publication is to be
used for any other purpose, and this publication is not to be reproduced, copied, disclosed, transmitted, stored in
a retrieval system or translated into any human or computer language, in any form, by any means, in whole or in
part, without the express prior written consent of InterSystems Corporation.
The copying, use and disposition of this document and the software programs described herein is prohibited
except to the limited extent set forth in the standard software license agreement(s) of InterSystems Corporation
covering such programs and related documentation. InterSystems Corporation makes no representations and
warranties concerning such software programs other than those set forth in such standard software license
agreement(s). In addition, the liability of InterSystems Corporation for any losses or damages relating to or
arising out of the use of such software programs is limited in the manner set forth in such standard software
license agreement(s).
THE FOREGOING IS A GENERAL SUMMARY OF THE RESTRICTIONS AND LIMITATIONS
IMPOSED BY INTERSYSTEMS CORPORATION ON THE USE OF, AND LIABILITY ARISING FROM,
ITS COMPUTER SOFTWARE. FOR COMPLETE INFORMATION REFERENCE SHOULD BE MADE TO
THE STANDARD SOFTWARE LICENSE AGREEMENT(S) OF INTERSYSTEMS CORPORATION, COP-
IES OF WHICH WILL BE MADE AVAILABLE UPON REQUEST.
InterSystems Corporation disclaims responsibility for errors which may appear in this document, and it reserves
the right, in its sole discretion and without notice, to make substitutions and modifications in the products and
practices described in this document.practices described in this document.
Caché with SQL® is a registered trademark, and InterSystems™, ISM™, DTM™, DSM™, DASL™ , and Caché are
trademarks of InterSystems Corporation.
Microsoft®, MS-DOS®, and Windows® are registered trademarks of Microsoft Corporation.
Windows NT
™
, Windows 95
™
and Windows 98
™
are trademarks of Microsoft Corporation.
Alpha , VAX
™
and OpenVMS
™
are trademarks of Digital Equipment Corporation.
For support questions about any InterSystems products, contact the InterSystems Worldwide Response Center:
U.S.:Tel: +1 617 621-0700Fax: +1 617 374-9391
Europe:Tel: +44 1753 830-077Fax: +44 1753 861-311
Internet — support@intersys.com
World Wide Web - www.intersys.com FTP Site - ftp.intersys.com
BBS Europe: +44(0)1753-853-534
Caché ObjectScript Language Reference iii
Preface
The
Caché ObjectScript Language Reference
is a multi-platform document that
describes Caché ObjectScript language elements on the following Caché plat-
forms:
■
Caché for Windows 95 and Windows 98
■
Caché for Windows NT
■
Caché for OpenVMS VAX
■
Caché for OpenVMS Alpha
■
Caché for UNIX
The
Caché ObjectScript Language Reference
does not discuss system usage or
operation. You can find that information in the following documents:
■
The
Caché Programming Guide
for information about programming devel-
opment on Caché systems.
■
The
Caché Basic System Management Guide
and the
Caché Advanced Sys-
tem Management Guide
for information about system management consid-
erations on Caché systems.
■
The
Caché Networking Guide
for information about setting up and running a
network.
■
The
Caché ObjectScript
Pocket Reference
for quick information about Caché
ObjectScript syntax.
Audience
This manual is intended as a language reference for Caché ObjectScript users
who are familiar with higher-level languages and have some familiarity with
basic operating-system concepts. Because this manual is designed for experi-
enced programmers, it does not present information tutorially.
Preface
iv Caché ObjectScript Language Reference
Organization of this Document
This guide is divided into two parts, five chapters, and two appendices.
Part I, Syntax
contains one chapter:
Chapter 1,
Overview of Caché ObjectScript
describes the coding and notation
conventions used in this guide, as well as Caché ObjectScript language elements,
expressions, postconditionals, indirection, and block structures.
Part II, Language Elements
contains four chapters:
Chapter 2,
Commands
describes the commands.
Chapter 3, Functions
describes intrinsic and extrinsic functions.
Chapter 4,
Special Variables
describes special variables.
Chapter 5, Structured System Variables
describes the structured system variables
(SSVNs) available in Caché.
Part III,
Appendices
contains three appendices:
Appendix A,
Caché ObjectScript Language Summary
, lists all of the elements in
the Caché ObjectScript programming language.
Appendix B,
ASCII Character Set
lists the characters of the ASCII character set
and their corresponding codes.
Appendix C,
I/O Command Keywords
lists the I/O keywords used by the OPEN,
USE, and CLOSE commands for specific I/O devices.
Typographic Conventions
This document observes the following typographic conventions:
Convention Meaning and Example
Bold and italic
type
User Input
Ex:
> USERNAME<Return>
Italic type The title of a manual
Caché ObjectScript Language Reference
In a syntax example, a command argument or function parameter for
which you supply a value.
C
LOSE
device
Preface
Caché ObjectScript Language Reference v
<RETURN> Keystrokes appear in uppercase and enclosed within angle brackets.
<CTRL-Z> Simultaneous keystrokes appear hyphenated, in uppercase, and
enclosed within angle brackets.
<SP> Indicates that a space must separate components of a command or
command line.
<TAB> Indicates that you press the Tab key.
Arial type. Caché ObjectScript syntax appears in this form, for example:
CLOSE{:
pc
}<SP>
closearg
{,...}
Note statements
appear in Arial
type.
Note:
Setting a mark in the text does not affect the
surrounding text in any way. Marks only serve
to define locations within the text.
{
item
} Indicates that the enclosed item is optional.
...
Indicates that additional command parameters can be added to the
command line.
.
.
.
Indicates a break between two illustrated lines of code or user input
and that all code or user input is not shown.
filespec
Indicates an OpenVMS file specification.
pathname
Indicates the path from the root to a directory or file on a UNIX or
WIndows system.
UNIX
Paragraphs or items that are marked with this word pertain only to
Caché ObjectScript on UNIX.
Alpha
Paragraphs or items that are marked with this word pertain only to
Caché ObjectScript on OpenVMS Alpha.
VAX
Paragraphs or items that are marked with this word pertain only to
Caché ObjectScript for OpenVMS VAX.
OpenVMS
Paragraphs or items that are marked with this word pertain to both
Caché ObjectScript on OpenVMS VAX and Caché ObjectScript on
OpenVMS Alpha.
NT95
Paragraphs or items that are marked with this word pertain to Caché
ObjectScript on Windows NT systems and Caché ObjectScript on
Windows 95 and Windows 98 systems.
NT
Paragraphs or items that are marked with this word pertain only to
Caché ObjectScript on Windows NT systems.
Win95
Paragraphs or items that are marked with this word pertain only to
Caché ObjectScript on Windows 95 and Windows 98 systems.
No implementa-
tion name
Anything not marked with an implementation name is common to all
Caché platforms.
Convention Meaning and Example
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