Object Data Model | InterSystems Developer Community

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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Article

Alberto Fuentes · Feb 19, 2016 2m read

Simple $system.Event examples

The attached file contains two $system.Event examples that processes work asynchronously using persistent queues:

Events_Simple.prj.xml
Events_PubSub.prj.xml - updated this example has been published on https://github.com/intersystems-ib/cache-iat-pubsub

Events_Simple

This is a very basic example that creates some worker processes and then enqueue messages to them using $system.Event.

#Object Data Model #Caché

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Announcement

Janine Perkins · Mar 22, 2016

Featured InterSystems Online Course: Caché Objects Introduction

Learn the basics about Caché objects.

#Object Data Model #Learning Portal

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Question

Jon Willeke · Mar 18, 2016

turn-key export of data for XML-enabled class?

An XML-enabled class has an XMLExport() method that knows how to serialize an instance to XML. To export all instances of a class to a file, I need to instantiate a writer and loop through the extent. Is there no class method like XMLExportToFile() that does this in one go?

#Object Data Model #Caché

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Question

Eduard Lebedyuk · Mar 17, 2016

How to get full URL from %Net.Request object after request

I have a %Net.Request object and I want to get a full URL of the request sent (preferably after all redirects, but even full initial one would be good). For example, I have the following method:

#Object Data Model #Frontend #Caché

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Question

Eduard Lebedyuk · Mar 11, 2016

Determine currently used service

I want to determine what service (eg. %Service_Console) is used for current process.

I can probably use some workarounds, i.e.

Is %request object present
Does $Device contain |TRM|
etc

But is there any centralised way to get current service?

#Object Data Model #Terminal #Caché

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Article

John Murray · Mar 15, 2016 1m read

Code metrics over time

Among the outputs of our Yuzinji tool are two code metrics that it can be interesting to track over time as a development project proceeds. These are Size and XS. The first is fairly straightforward. As you write more code the size of your codebase increases. The XS metric (pronounced "excess") aims to quantify excessive structural complexity.

#Object Data Model #Caché

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Question

Jochen Roese · Mar 14, 2016

[SOLVED] Compiling projections after creating

[SOLVED]

added

>/tmp/compilew.log &>/tmp/compilew.log ; tail /tmp/compilew.log

to redirect the output to the stdout. Somehow the javac has wierd behavior with the output on errors and verbose information.

Hi,

i want the JAVA-Projections and wrappers to compile after Caché created the files. The creation of the files works 100%.

My addition to createProjection in our Projectionclass is following:

#Compiler #Object Data Model #Caché

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Article

John Murray · Mar 7, 2016 1m read

Investigating dependencies

When developing or maintaining Caché Objects applications, or even ones written in plain COS code, it's sometimes useful to investigate dependencies. Yuzinji is a tool that analyzes the Caché class dictionary plus the COS code within methods and routines, then feeds its results into Structure101g Studio.

#Object Data Model #ObjectScript #Caché

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Question

Tiago Ribeiro · Feb 25, 2016

Better Unit Testing Strategies for InterSystems Caché Development

Good morning people.
The use of TDD is currently being reference for software delivery more confiabilitade and quality.

At the company I work developing web applications , we create tests for method class in a deteminado package and running the steps that the documentation recommends:

1 export the tests classes to a predefined folder.
2- And running the test ( D ## class (% UnitTest.Manager ) .RunTest (,"/nodelete" )

It is a lot of work to do the export and run these tests would have a resource that we could only run the tests without the need for export ?

#Object Data Model #Testing #Caché

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Article

Dmitry Maslennikov · Feb 23, 2016 14m read

Custom Studio file

Developing an idea with RuleEngine in XData, we could even refuse from editing full class and edit only valuable xml. Sometime ago I have already written an article(in russian) about such possibility, even more, in that article I wrote about compilable JavaScript to Caché.

#Object Data Model #Studio #Caché

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Article

Dmitry Maslennikov · Feb 21, 2016 6m read

XData Studio Assist

Some days ago Alberto has written a very interesting article about the usefulness of ObjectGenerators available in Caché.

#Development Environment #Object Data Model #Studio #Caché

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Question

Eduard Lebedyuk · Feb 17, 2016

Basic queue handling

Let's say the user need to execute some heavy code (build a report, or extensive calculations etc.). So, of course it needs to be asynchronous, and we possibly need to store some data about execution status. How?

#Object Data Model #Caché

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Article

Alberto Fuentes · Feb 19, 2016 3m read

Object Generators: a homemade RuleEngine

The attached file contains an example of code generation using ObjectGenerators which builds a very simple homemade RuleEngine.

Code generation is an excellent way of increasing performance moving run-time calculations to compile-time.

We could generate code creating routines or implemeting methods using ObjectGenerators. In this example we are using ObjectGenerators.

Update: Rule Engine is now on GitHub https://github.com/intersystems-ib/cache-iat-ruleengine

#Code Snippet #Compiler #Object Data Model #Caché

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Question

Joel Solon · Feb 18, 2016

Variable Number of Arguments to a Method

This morning on the old Caché Google Group, someone posed the following question, which I've decided to answer here, because it's interesting!

Is there a way to iterate ClassMethod's params, and get param's names and values?

The first answer I can come up with is: it's not easy! In any method, you could try to write code like this (where methodName is the name of your method):

#Languages #Object Data Model #ObjectScript #Caché

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Announcement

Janine Perkins · Feb 16, 2016

Featured InterSystems Online Course - Caché Objects Introduction

Do you need to build an object-oriented application using Caché? Take this course to learn how to create, retrieve, update and delete objects in Caché.

Caché Objects Introduction

#Object Data Model #Learning Portal

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Question

Timothy Leavitt · Feb 9, 2016

Property with SqlComputed and SqlComputeCode, but not Calculated or SqlComputeOnChange

Looking at a property defined as follows:

#Object Data Model #ObjectScript #SQL #Caché

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Article

Kyle Baxter · Feb 2, 2016 1m read

Creating an IDKEY with a chosen name

What do you do if you want to have the ID field have a meaningful name for your application?

Sometimes it comes to pass that when you're making a new table that you want to have the unique row identifier (a.k.a. IDKEY) to be a field that has a name that is meaningful for your data. Moreover, sometimes you want to set this value directly. Caché fully supports this functionality and it works Suppose you have a class Test.Kyle. The data will be stored like so:

^Test.Kyle(IDKEY)=$LB("",Field1,Field2,...,Fieldn)

#Object Data Model #SQL #Caché

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Article

Alexander Koblov · Jan 29, 2016 9m read

Creating a Custom Index Type in Caché

The object and relational data models of the Caché database support three types of indexes, which are standard, bitmap, and bitslice. In addition to these three native types, developers can declare their own custom types of indexes and use them in any classes since version 2013.1. For example, iFind text indexes use that mechanism.

#Best Practices #Databases #Indexing #Object Data Model #SQL #Caché

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