Stefan Traby > Cac-1.83 > Cac

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NAME ^

Cac - Integration of Intersystems Cache Database into Perl

SYNOPSIS ^

  use Cac qw(:lowlevel :highlevel);
  _CacEval '$ZV'; print _CacConvert();

This module and all modules in the Cac::-Domain require a perl that has Cache fully embedded. (such a binary is a dual-binary that is a Perl and a Cache binary at the same time. Usually there is a softlink (ln -s cache cperl) so you don't need to use cache --perl anymore, it works the following way:

use:

  o cache --perl [perl options ]    and you start perl with embedded cache
  o cperl [ perl options ]          and you get perl with embedded cache
  o cache [ cache options ]         and you get cache with embedded perl

For backward compatibility with older versions of Cache-Perl

  o cache -perl [ perl options ]

is still supported but this feature is deprecated. Use "--perl" instead of "-perl".

Note: Most of this stuff is the low-level Interface, you normally don't need it, except maybe CacEval and CacExecute.

  o use Cac::ObjectScript     - for embedded ObjectScript support
  o use Cac::Global           - for high-performance global access (bulk support)
  o use Cac::Routine          - for calling routines and functions
  o use Cac::Bind             - for bidirectional binding of COS Variables to Perl variables
  o use Cac::Util             - for utility functions and helpers

DESCRIPTION ^

 * This module provides full access to most Cache call-in functions.
 * You should not use the call-in function without exactly knowing what you are doing
 * These function are not exported by default and prepended by a underscore (that means internal).
 * All functions are perlified - you pass a single string if Cache expects a counted string
 * You don't need to check for errors. Most functions raise exceptions on error: use eval { }; to catch them
 * Only "A" functions are supported, no "W". "W" is NOT Unicode anyway, Intersystems simply lies to you.

User Interface for Cache Functions ^

CacEval $expr
 Evaluates a ObjectScript expression and returns its result
 Exception: yes
 Note: This function is slow because it has to preserve terminal settings
CacExecute $stmt
 Executes a ObjectScript command and returns nothing.
 Exception: yes
 Note: This function is slow because it has to preserve terminal settings

Cache Call-In High-Level Functions ^

The high-level functions can be imported by: use Cache ':highlevel';

_CacAbort [ CACHE_CTRLC | CACHE_RESJOB ]
 See Cache specification.
 Exception: Yes
 Note: Don't use it.
$ctx = _CacContext()
 See Cache specification.
 Exception: No
$value = _CacConvert()
 See Cache specification.
 Exception: Yes
 Note: This function calls CacConvert(CACHE_ASTRING, ...)
$value = _CacConvert2()
 This routine uses CacType() to ask for the type of TOS and
 tries to get the value the fastest way possible.

 Exception: Yes
_CacCtrl($bitmap)
 See Cache specification
 Exception: Yes
$converted = _CacCvtIn($string, $table)
 See Cache specification
 Exception: Yes
$converted = _CacCvtOut($string, $table)
 See Cache specification
 Exception: Yes
_CacEnd()
 See Cache specification
 Exception: Yes
 Note: You should NEVER EVER call this! even POSIX::_exit(1); is prefered.
$error = _CacError()
 See Cache specification
 Exception: Yes (if a double fault happens)
 Note: No need to call this because every error is reported by croak.
$errorstring = _CacErrxlate($errornum)
 See Cache specification
 Exception: No (if the call to CacheErrxlate fails, undef is returned)
_CacEval $string
 See Cache specification
 Exception: Yes
_CacExecute $string
 See Cache specification
 Exception: Yes
$prompt = _CacPrompt()
 See Cache specification
 Exception: Yes
 Note: Experts call this functions only by accident. :)
_CacSignal $number
 See Cache specification
 Exception: Yes
 Note: Think and you will find out that you don't want it in most cases.
_CacStart($flags, $timeout, $princin, $princout)
 See Cache specification
 Exception: Yes
 Note: Don't call it. It's already done. Say simply thanks :)
$type = _CacType()
 See Cache specification
 Exception: No (ahm, check the return value for errors)

Cache Low-Level Call-In Functions ^

 The low-level functions can be imported by:
 use Cac ':lowlevel';

Use it only IF:

  * you know how to use gdb
  * you want to corrupt the database
  * you never use a condom anyway :)
  * you know what gmngen/checksum/mdate is made for :)
_CacCloseOref $oref
 See Cache specification
 Exception: Yes
_CacDoFun $rflags, $numargs
 See Cache specification
 Exception: Yes, please.
_CacDoRtn $rflags, $numargs
 See Cache specification
 Exception: Oui
_CacExtFun $rflags, $numargs
 See Cache specification
 Exception: Da
_CacGetProperty()
 See Cache specification
 Exception: Yes, sir.
_CacGlobalGet $numsubscipt, $die_or_empty
 See Cache specification
 Exception: yup
_CacGlobalSet $numsubscript
 See Cache specification
 Exception: yup, on weekends only.
_CacIncrementCountOref $oref
 See Cache specification
 Exception: ja
_CacInvokeClassMethod $numarg
 See Cache specification
 Exception: si
_CacPop $arg
 Not implemented
 Exception: yes
$val = _CacPopDbl()
 See Cache specification
 Exception: yes
$val = _CacPopInt()
 See Cache specification
 Exception: yes
$string = _CacPopList()
 Currently not implemented
 Exception: yes
$oref = _CacPopOref()
 See Cache specification
 Exception: yes
$str = _CacPopStr()
 See Cache specification
 Exception: yes
$ptr = _CacPopPtr()
 Not Implemented
 Exception: yes
_CacPushClassMethod $classname, $methodname, [$flag]/
 See Cache specification
 Exception: /bin/true
 Note: flag defaults to 0
_CacPushDbl $double
 See Cache specification
 Exception: yes
$rflags = _CacPushFunc $tag, $routine;
 See Cache specification
 Exception: yes
$rflags = _CacPushFuncX $tag, $offset, $env, $routine;
 See Cache specification
 Exception: yes
_CacPushGlobal $global
 See Cache specification
 Exception: yes
_CacPushGlobalX $global, $env
 See Cache specification
 Exception: yes
_CacPushInt $i
 See Cache specification
 Exception: yes
_CacPushList $string
 See Cache specification
 Exception: yes
_CacPushMethod $oref, $methodname, [$flag]
 See Cache specification
 Exception: yes
 Note: $flag defaults to 0
_CacPushOref $oref
 See Cache specification
 Exception: yes
_CacPushProperty $oref, $property
 See Cache specification
 Exception: yes
_CacPushPtr $value
 See Cache specification
 Exception: yes
$rflags = _CacPushRtn $tag, $routine
 See Cache specification
 Exception: yes
$rflags = _CacPushRtnX $tag, $offset, $env, $routine
 See Cache specification
 Exception: yes
_CacPushStr $string
 See Cache specification
 Exception: yes
_CacSetProperty()
 See Cache specification
 Exception: yes
_CacUnPop()
 See Cache specification
 Exception: yes

SEE ALSO ^

Cac::ObjectScript, Cac::Global, Cac::Routine, Cac::Util, Cac::Bind.

AUTHOR ^

 Stefan Traby <stefan@hello-penguin.com>
 http://hello-penguin.com

COPYRIGHT ^

 Copyright 2001,2003,2004 by KW-Computer Ges.m.b.H Graz, Austria
 Copyright 2001,2002,2003,2004 by Stefan Traby <stefan@hello-penguin.com>

LICENSE ^

 This module is licenced under LGPL
 (GNU LESSER GENERAL PUBLIC LICENSE)
 see the LICENSE-file in the toplevel directory of this distribution.
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