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#Object Data Model

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An object data model is that data or code is composed of modules that combine data and procedures that work on the data.

Learn more.

Question
· Mar 24, 2017
Convert to JSON string

here is my $ZV string "Cache for Windows (x86-64) 2016.2.1 (Build 803) Wed Oct 26 2016 12:43:35 EDT"

two questions

1. How do i convert any Persistent object to JSON String ?

2. How do i convert an y Register object to JSON string ?

3. Do i need to extend from any adaptor class for 1 & 2 ?

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Can you create ad-hoc Caché relationship objects that are not part of the original Caché class definition? One of the drawbacks with relationships is that that the more relationships you have defined, the more difficult it can be manage. I was wondering rather than having all your relationships defined in the Caché class, could you programmatically create relationships between classes as and when they are required?

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Question
· Mar 26, 2017
How to split an xml into 3 xml

Hi,

I have a xml stored in a globalCharrachter Stream.

I would like to get a full node parts of the xml to store it in an other file.

Exemple of an Xml store in cache

<doc>
<header></header>
<product></header>
<market></marker>
<doc>
</aaa>

I would like to generate new xml from this one like

<product></product> to product.xml

<market></market> to market.xml

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Goal:

  • Take an HL7 message, parse some data from it
  • Call a web service to get an authorization key, comes back as a simple string
  • Create a request object with data from the HL7 message and send it to the Web Service

The main web method call requires that key I received as a Soap Header element. All I can pass to the SOAP Operation business class is the request object with the data I plucked from the HL7 payload. Nothing in that particular request message has anything in it that tells anything to send the header, too.

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Let's say I have two classes: A and B. They share no common parent except %SystemBase. But these classes have some properties with the same name (type may be the same or not):

Class A {

Property data As C;

Property data2;

}
Class B {

Property data As D;

Property data3;

}

I need to automatically convert object of class A into object of class B. I'm planing to write a class generator that generates a separate class that converts A to B. It would work like this:

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Overview

Encryption of sensitive data becomes more and more important for applications. For example patient names, SSN, address-data or credit card-numbers etc..

Cache supports different flavors of encryption. Block-level database encryption and data-element encryption. The block-level database encryption protects an entire database. The decryption/encryption is done when a block is written/read to or from the database and has very little impact on the performance.

With data-element encryption only certain data-fields are encrypted. Fields that contain sensitive data like patient data or credit-card numbers. Data-element encryption is also useful if a re-encryption is required periodically. With data-element encryption it is the responsibility of the application to encrypt/decrypt the data.

Both encryption methods leverage the managed key encryption infrastructure of Caché.

The following article describes a sample use-case where data-element encryption is used to encrypt person data.

But what if you have hundreds of thousands of records with an encrypted datafield and you have the need to search that field? Decryption of the field-values prior to the search is not an option. What about indices?

This article describes a possible solution and develops step-by-step a small example how you can use SQL and indices to search encrypted fields.

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I have been following the online Zen Quickstart Tutorial using the lastest release documentation. In addition to playing around with the styling and making a few minor functionality tweaks, I wanted to add an additional column that shows a count of the number of phone numbers for that Contact (as shown in the image below).

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Article
· Mar 4, 2016 1m read
Getting my head around a class model

There's plenty of goodness in the %-packages InterSystems supplies, and it seems that every new version of Caché brings something new. The browser-based class documentation (a.k.a. Documatic) generally provides a good level of information, but on the basis that "a picture is worth a thousand words" I sometimes want a diagram.

For example, when trying to navigate the %Dictionary package for a project that needed to find out about class definitions, here's one of the UML class diagrams I created.

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A method to convert certain non-readable ASCII characters in a %Stream.FileCharacter object first copies it into a %Stream.FileBinary object and then loops through each character one at a time to find and convert these offensive characters to our interpretation of their readable ASCII equivalents . The loop is sequential (while 'bStream.AtEnd) and is taking too long for large files.

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Hi,

I am saving 2000 objects of a class in a loop.

In one environment it is taking a total of 86 seconds and in another environment it is taking 0.55 seconds.

The code (the class and the code for save) is same for both the environment. I have Ensemble 2012.1.5.956

Can somebody help me to identify the cause of the discrepancy. Is there any memory or any other setup which may cause the problem.

Thank you in davance,

Susobhan

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Article
· Mar 2, 2017 1m read
Trusting the code you import

As more people join Developer Community, and with increasing efforts to promote code sharing, I'd like to draw fresh attention to this post I wrote a year ago. It spotlights a feature within the class compiler which is both useful and dangerous. When importing code (e.g. from an XML export of classes received from someone), it's worth considering the risks.

Even if that post doesn't seem relevant to you at the moment you may wish to note it for the future. A handy way of doing this is to click the star icon at the end of it.

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Hi!

Consider I have a class Package.Data with Property UniqueStringValue as %String.

I introduced the Index for this property:

 Index ValueIndex on UniqueStringValue [Unique];

It works well. But if I try to check if there is an object with the certain value in code like this:

if ##class(Package.Data).ValueIndexExists(value)

this expression fails, if value="value", even if there is an instance with instance.UniqueStingValue="Value"

How can I set the index to prevent saving case sensitive values in this class?

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Question
· Feb 21, 2017
Parse %ObjectIdentity

Hi!

I'm trying to implement %OnAfterDelete ClassMethod for persistent class. As a parameter it gets oid As %ObjectIdentity for the deleted object.

ClassMethod %OnAfterDelete(oid As %ObjectIdentity) As %Status

My question is: how to get ID value from %ObjectIdentity ?

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Question
· Feb 13, 2017
Connecting using factory

The following code in .Net using CacheObject.dll version 2016.1.2.206 com library

ConnectionString = "cn_iptcp:10.56.135.160[1972]:PHDEMO:PHSYSADM:***********"

b = factory.Connect(ConnectionString )
objCacheObject = factory.Static("CacheObjectConnection")
clist = factory.GetConnectionList()

for the above code, b is true and clist is Local,cn_iptcp:127.0.0.1[1972]:

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In the table/class HS_Registry.document there is a column/property named RepositoryUniqueId. There are about 14 unique values, which pretty much lines up with the number of our "Push" (Provide & Register) participants and thus unique document repositories. However, these values just look like OIDs. I've been searching for over an hour and I can't find anywhere that will provide me some context to these "Repository IDs".

Anyone have ideas or suggestions where I could find this info?

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Many mobile applications that enable users to get information about road fines and pay them, send notifications about newly added fines. This functionality can be efficiently implemented using push notifications sent to users’ devices.

Our application was not an exception. The server side is based on the Ensemble platform that offers integrated support of push notifications starting from version 2015.1.

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Recently I came across a very strong statement to the effect that InterSystems.Data.CacheClient.dll library works fast because it does not open a TCP/IP connection, instead it works in the same process as a database. It made me pause for quite some time. Firstly because .Net Managed Provider, which utilises this library, opens TCP/IP connection to the database (and it is stated in the documentation "Using .NET and the ADO.NET Managed Provider with Caché"). And secondly, because as far as I know only eXtreme applications attach themselves to the process.

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Question
· Dec 22, 2016
Computed property

Hi,

I have 3 classes defined to model the team/team-member/employee relationship, where each employee can belong to multiple teams, each team can have multiple employees, and one and only one team member is a team leader:

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Using the following...

//Get PDF stream object previously saved
   Set pdfStreamContainer = ##Class(Ens.StreamContainer).%OpenId(context.StreamContainerID)
   Try {
     Set pdfStreamObj = pdfStreamContainer.StreamGet()
   }
   Catch {
      $$$TRACE("Error opening stream object ID = "_context.StreamContainerID)
      Quit
   }

Would it be possible to search the pdfStreamObj for certain values like a Medical Record, or Patient Name?

Thanks

Scott

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