Object Data Model | InterSystems Developer Community

Question

Michael Gosselin · Jul 29, 2016

How best to "break" my code

Hello,

I've been doing this for years. Well, decades. And, I pride myself in being able to break other people's code.

However, sometimes I don't apply the same dedication to breaking my code. That needs to change.

#Object Data Model #Caché

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Question

John Murray · Jul 28, 2016

What does the "Routine Prefix" setting of a package do?

Studio's "Package Information" dialog, accessed from the context menu of a package on the Namespace tab of the Workspace pane, includes a field titled "Routine Prefix"

#Object Data Model #Caché

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Question

Wendy Griffiths · Jul 22, 2016

Overriding the property setter and getter methods

I want to override the Get and Set methods of a class property. The class maps to a pre-existing global. The property is defined like so:

Property Invalid As %Library.Boolean;

with the property mapping to a node like ^GLOBAL(Code,"INVALID")=1
Code is a property in the same class.

The value can be 0 or 1 or the node might not exist. When it doesn't exist I want the value of the SQL field to come out as 0 (false).

#Mapping #Object Data Model #SQL #Caché

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Question

Kevin Furze · Jul 26, 2016

overriding the logicalToDisplay() meothods

Cache 2015.2

I need to get a sort order stored in my database with mutiple decimal places, but I want the string stored and retrieved EXACTLY as I enter it. so if someone enters 700.3000 I don't want cache to treat it as a decimal and strip the trailing zeros storing it as 700.3

once it comes back, I want the sorting to sort AS STRINGS, again, none of that stripping training/leading zeros.

this ay, I can create local arrays in exactly the order they think? they created them

#Object Data Model #Caché

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Question

Rustam Ibragimov · Jul 26, 2016

Find mapped file

Hello, guys.

I have a set of file names (e.g. file.cls, file2.mac and so on) and I need to check whether these files are mapped in %ALL or current namespace.

I found that if I open Globals in the current namespace I can see mapped packages. And If I open this global I see all files that are to this namespace and %SYS. The problem is these files are enumerated in a json object(apparently)

ex. "{""class"":{""%Activate.Enum"":{},""%Activate.GenericObject"":{""CreateObject"":0,""GetObject"":0},""%Activate.HandleEvents"")

#Object Data Model #Caché

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Question

Adrian Kerr · Jul 25, 2016

How can we use %Stream.Object as an abstract definition of a morphable object ?

Let's say that we wish to store the documents sent to us via all of our Customers, and that the documents could be in PDF, spreadsheet, RTF, plain text, Comma-Separated-Values and XML.

It would be hoped that %Stream.Object would be a good choice of property to hold these documents, especially as you would expect %Stream.Object to morph between BINARY (for PDF, spreadsheet, RTF) or CHARACTER (for plain text, CSV, XML) depending on which type of stream was being persisted.

#Object Data Model #Caché

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Question

Rustam Ibragimov · Jul 21, 2016

Create dfi files (dashboards) programmatically

Hello, guys.

Is there a way to create a dashboard programatically?

I have a source code of a dashboard in udl format and I need to somehow import it in my project.

%Compiler.UDL.TextServices works only with classes and ##class(%Routine).%New("dashboard.dfi") doesn't work as well.

#Object Data Model #Caché

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Article

Timur Safin · Jul 18, 2016 15m read

Remote proxy objects via dynamic dispatch

This article created as side effect of preparations to the longer set of articles about simple, but still handy MapReduce implementation in Caché. I was looking for relatively easy way to pass arguments to (potentially) multiple targets via remote calling facilities. And after several attempts I have realized that we do have very powerful mechanism in the Caché ObjectScript which might be of particular help here – dynamic dispatch for methods and properties.

#Code Snippet #Object Data Model #Caché

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Question

Rustam Ibragimov · Jul 20, 2016

Get classname from udl based file

Hello, guys.

I want to add a class to my project. This class is in UDL format.

I know that there is a method: ##class(%Compiler.UDL.TextServices).SetTextFromStream. The problem is that to use this method I need to know the name of the class (including all packages) in advance. But, a class can have any name(I mean C:/source/AAA/BBB/CCC.cls, but the real name is Sample.Human.cls).

For now I found only one way to get to know the name of a class - just parse the class code and search for a word which is followed by "Class" word. Is there any better way to do that?

#Object Data Model #Caché

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Question

Rustam Ibragimov · Jul 15, 2016

How to write into Cache classes, routines etc

Hello, guys.

I have an external file that contains data in UDL format(as in Studio, not XML) and I need to somehow overwrite my source file with that file.

I tried to use this snippet for .mac file

#Object Data Model #Caché

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Question

Paul Riker · Jun 29, 2016

CSP Illegal Value error

I've created a CSP page to take in a base64 value from a <textarea> and decode it. When I run it I get the error . Any ideas?

Error: <ILLEGAL VALUE>zOnPageBODY+28^csp.decode.1

ErrorNo: 5002

Here is my code

#CSP #Object Data Model #Caché

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Article

Eduard Lebedyuk · Jun 28, 2016 1m read

Calculate class or package length in sloc

Here's a code snippet to calculate the length of a class or a package in lines of code:

#Code Snippet #Object Data Model #Caché

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Question

David Losiewicz · Jun 23, 2016

Enable $$$GeneralError Macro

I am testing application code and want to simulate error conditions.

I am trying to use the following to define a custom error with a class method.

$SYSTEM.Status.Error($$$GeneralError,"Any text here")

My class method code looks like this....

#Object Data Model #ObjectScript #Caché

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Closed

Job

Fred Gustafsson · Jun 22, 2016

Cache Objects Web Developer needed in Central London

Job Description
Caché Objects Web Developer

short line

An excellent opportunity exists for an enthusiastic Caché Objects full stack web developer to join our rapidly growing company based near Old Street.

#Git #JavaScript #Object Data Model #Job Opportunity

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Question

Daniel Kutac · Jun 21, 2016

MSM Workstation having problem with $double(0)

Customer is using an ancient MSM based client Workstation for their application and they made a small change to their server code. They introduced property of %Double() and discovered an issue. The MSM workstation is not able to retrieve any property of an object instance that holds value of $double(0). see images illustrating the issue.

I'm posting this to DC intentionally before I eventually send it to WRC so others can comment.

Dan

Image 1 - data

image 2 - UI

#Object Data Model #Caché

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Question

Francis Galiegue · Apr 27, 2016

Request of sorts: creating a help page on community to work with lists/arrays/multidimensional properties/etc

Hello,

I am still a beginner with COS and am struggling with these concepts. While digging through the official documentation will eventually tell you everything you need to know, getting started is nevertheless not an easy feat...

Is it possible to create a "lists/array/multidimensional 101" page for beginners? And, for instance, its interaction with $data, what it means to use "as list of something" or "as array of something", how to walk lists, how to add/remove elements, how to extract sublists etc?

#Object Data Model #ObjectScript #Caché

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Question

Eduard Lebedyuk · Jun 9, 2016

Cheap object hashing?

Problem: Caché instance connects periodically to an Oracle database via jdbc and downloads data. Sometimes data on a remote server would change.

#Business Service #JDBC #Object Data Model #ODBC #Caché

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Question

Andy Richards · Jun 1, 2016

Activating an index

I have a production system that has a large dataset of about 2 million rows. I need to create an index on a property but don't want it available to queries until the index is fully populated. Is there a way I can create the indexed, fire off the build, then "activate" the index so queries can use it.

#Indexing #Object Data Model #Caché

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Question

Jose Sampaio · May 30, 2016

Override property name to generate a JSON message

Hi community!

Does anyone know if it´s possible to override a property name to generate a JSON message based on the instance of object?

Thanks,

José Sampaio

#JSON #Object Data Model #Caché

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Question

Mark Bolinsky · May 19, 2016

Can Object Synchronization be used with more than two servers?

Consider a design where there could be three or four or more servers and there is a need to have these eventually consistent between them all (and not considering database mirroring here).

#Distributed Data Management #Object Data Model #Caché

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Article

Mark Hanson · May 11, 2016 1m read

ZZPRINT a handy way to view routine lines from the command line

Often when debugging COS code you get an error message such as '<UNDEFINED>test^routine *test' so the first thing you want to do is to take a look at this code and see what it is doing. From the command line you can:

#Object Data Model #ObjectScript #Caché

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Article

Nikita Savchenko · May 6, 2016 8m read

Installing Caché Applications Using Class Projections

Greetings! This article describes yet another simple way of creating installers for the solutions based on InterSystems Caché. The topic covers applications, which can be installed or completely removed from Caché with one action only. If you are still documenting installation instructions that have more than one step to do to install your application — it’s high time you automated this process.

#Compiler #Deployment #Object Data Model #Terminal #Caché

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Question

Michael (Libert... · May 9, 2016

Intellisense not working correctly in editor.

I was writing a routine that called some class methods and when I typed in ##class( and the package, there was a drop down list of all the classes that match that package but when I selected one of the dropdown entries it added the package name again.

For example if I enter ##class(dim.

I am presented with a list of classes in the dim package but when I selected one of them,(dim.OccupationList), what ended up in the editor was

##class(dim.dim.OccupationList

#Object Data Model

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Announcement

Evgeny Shvarov · May 5, 2016

Developer Community April 2016 Digest

Hi!

Here is April digest of most interesting and valuable postings on Developer Community in April 2016.

Here we go!

News and Events

InterSystems Global Summit 2016 - Session Content

Sources for InterSystems Global Summit 2016 Sessions and Expereiences

2015.2.3 Maintenance Release

#Digest #Object Data Model #Developer Community Official

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Question

Fabio Goncalves · Apr 29, 2016

%Library.GlobalCharacterStream deprecated

On the class reference %Library.GlobalCharacterStream is marked as deprecated in favor of %Stream.GlobalCharacter.

How I can migrate the data from class properties defined as %Library.GlobalCharacterStream to the new one %Stream.GlobalCharacter?

Does the %Stream.GlobalCharacter have the same SQL support from %Library.GlobalCharacterStream?

Thanks.

#Object Data Model #SQL #Caché

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Question

Richard Housham · Apr 22, 2016

Transformations

Hi this is my first post, so a little about my background. I've been programming in PHP/JavaScript for about 10 years.
I've got quite a bit of knowledge surrounding object orientated programming and know the basics.

Last year I looked into the Mirth integration engine and did some work around that.

I've now moved jobs and I'm doing some work (surprise, surprise) with Ensemble.

#DTL #Object Data Model #Tutorial #Ensemble

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Question

Eduard Lebedyuk · Apr 19, 2016

JSON, Cache and Date/Time

I have a Cache classes with %TimeStamp (e.g. 2016-04-18 12:29:11) and %Date (eg. 64027) properties. And I have a javascript client app, which needs full CRUD over this properties.

But in javascript date/time are defined by ISO8601 (e.g. timestamp 2016-04-18T12:29:11Z, date 2016-04-18).

#JavaScript #JSON #Object Data Model #REST API #Frontend #Caché

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Question

Eduard Lebedyuk · Apr 10, 2016

Is it possible to call classmethod of a current class from method generator?

Here's my code (download):

Class Utils.Generators [ Abstract ]
{

ClassMethod B()
{
    s ^a = 1
}

ClassMethod A() [ CodeMode = objectgenerator, GenerateAfter = B, PlaceAfter = B ]
{
    k ^a
    do ..B()
}

Now, obviously for it to work I need method B compiled and ready to use before compiling method A().

I test it with the following code:

#Compiler #Object Data Model #Caché

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Question

Chip Gore · Apr 5, 2016

How do you access the storage map for a cache class programmatically?

Hi -

I'm trying to create a method that will automatically create something I can save and use later, which will let me automate data migration from one version of a class to the next.

#Compiler #Mapping #Object Data Model #Caché

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Question

Eduard Lebedyuk · Mar 28, 2016

How to display or save stack information?

Hello.

For debugging purposes I sometimes need to display stack information to the current device or save it (to a global for example).

There is this snippet offered in documentation:

ClassMethod StackToDisplay()
{
    For loop = 0:1:$Stack(-1) {
        Write !, "Context level:", loop, ?25, "Context type: ", $Stack(loop)
        Write !, ?5, "Current place: ", $Stack(loop, "PLACE")
        Write !, ?5, "Current source: ", $Stack(loop, "MCODE")
        Write !
    }
}

And to save stack to a global there's always an exception method:

#Code Snippet #Debugging #Object Data Model #Caché

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