#ObjectScript

InterSystems technologies are renowned for their high performing databases, which support the systems and operations of many organisations. However a key ingredient to this success is the quality and maintainability of their code. 

The quality of code can impact everything from speed and ease of fixing bugs and making enhancements, to the overall performance of your organization and your ability to get ahead in the marketplace. 

By ensuring your code is maintainable, you can reduce approximately 75% of the systems life cycle costs*. This is why, at George James Software, the solutions we build are always straightforward and written in high quality code - because we know that this solid foundation can positively impact the rest of your organization. 

With a maintainable system you're able to reduce your overall maintenance as any issues that occur are significantly faster to identify and fix. This means you're free to allocate that time and budget to enhancements, enabling you to get the most value out of your applications and ultimately better support your organization. 

Keep an eye out for our next few posts about what a maintainable system looks like and the tools that can help you keep your code maintainable, in order to help you to reduce those maintenance costs.  

In the Caché Foundations course, students are learning about Caché Development and ObjectScript syntax at the same time. To help students complete the exercises, we provide an ObjectScript Quick Reference (aka "the Cheat Sheet").

It is not a reference for all of ObjectScript! It is a list of the ObjectScript commands and functions that students use during the course, along with common syntax for objects, collections, etc. It also contains some useful macros.

We are providing a pdf version to the Developer Community.

I was looking at the thread of messages on the topic of "Performance when constructing a comma-separated string", and I started writing a response but got distracted, the page refreshed, and I lost my text. I couldn't spend the time rewriting my response, so I started writing this document instead.

I started writing MUMPS at the beginning of my career. I wrote very tight and dense code blocks where exercises such as the string example were authentic challenges.

Hello,

I don't know if the title is accurate enough. I have a legacy code that I need to optimize. It's a routine written in objectscript. It accepts 4 parameters and runs 6 nested FOR...$ORDER reading a big global.

The thing is when I run the routine the first time it takes around 60 seconds to run. If I run it again it takes 5 seconds. If I wait around 6 to 10 minutes to run it again, it takes 60 seconds again, but if I run it every 1, 2, 3... minutes it still takes only 5 seconds to run.

I am receiving the following error in my buisness operation:

ERROR <Ens>ErrException: <UNDEFINED>zGo2+181^mb.MbMainOperation.1 *tSC -- - registered as '-' number - @' set pResponse = ##class(mb.MbMessageResponse).%New()'

From what I understand, the problem occurs in the generated int file mb.MbMainOperation.1 in the method zGo2, with the offset of 181 lines, and the variable in question is a local variable tSC.

However, the line where the error occurs does not refer to tSC in any way

set pResponse = ##class(mb.MbMessageResponse).

At the moment I am trying to write a documentation file for a project and intend to use LaTeX for it.
Has anyone already had experience with this? I haven't found syntax highlighting with the LaTeX packages I know yet.
I found a request on Pygment but it was from 2016 and there was no reply on it since then.

Does anyone know a simple way for syntax highlighting COS in LaTeX?
Thanks for your input!
 

Martin

If I open a terminal and type the following commands, sc is an error:

set validator = "sc = ##class(%Library.Numeric).IsValid(""BLAH"")"
set @validator
write sc

At the end, when I write sc I get:

0 L'BLAH9
             DOCXT010,#e^zIsValid+1^%Library.Numeric.1^1e^^^1

However, if I call the following class method using the arguments "%Library.Numeric" and "BLAH", sc is undefined

 ClassMethod testvalidator(class As %String, value As %String) As %Status
{
set validator = "sc = ##class("_class_").IsValid("""_value_""")"
write validator,!
set @validator
write sc,!

I am trying to figure out the best ObjectScript analog to mimic, more or less, the %RCOPY functionality. What would be ObjectScript method(s) if any to copy a routine from the current namespace to another one and compile it there?

Hi

Following API:
http://api.aladhan.com/v1/gToH?

I have a %Stream that I want to insert some text into the middle of.  I create a new stream called pNewContentStream from the original stream, then I do a MoveTo in pNewContentStream to get to the byte position I want to insert into but when I do my Write, my pNewContentStream gets obliterated with only the text that I wrote, the original content goes away and all I'm left with is my Write text.

Method AddContentTypeCode4(pContentStream As %Stream.GlobalCharacter, Output pNewContentStream As %Stream.GlobalCharacter) As %Status
{
Set tStatus = $$$OK
try {
Set tTemp = pContentStream.

Hello,

I’m looking for a way to find out which category of portal a connector belongs to.
I looked at the class ‘Ens.Config.Production’ and ‘Ens.Config.Item’ but without success.

An idea about the ‘ObjectScript’ code to design?

Best Regards.

Hello,

I'm experiencing a recurrent problem that I haven't found the way to solve, so I'm coming here with the hope somebody can give me a new approach.

To make it short: we are creating categories on-demand to be able to place the maximum numbers of workers in memory, avoiding the limits established by system categories. But from time to time, one of this creation fails and system is no able to start the queue. The error we are getting is:

ERREUR #7823: Invalid work queue manager category supplied 'User.65733'.1<INVALID OREF> 

The code is very simple:

s ^%SYS("WQM","MaxActiveWorkers","User.

I am executing the command:

      set fileComp = ##Class(SYS.Database).FileCompact(obj.Directory, freeSpace, .actualFree)

      where obj.Directory contains the location of the current database

This executes correctly. However, the resultant OREF object does not contain any displayable properties but rather is of the value:

       "0 "_$lb($lb(380,,,,,,,,,$lb(,"%SYS",$lb("e^zFileCompact+38^SYS.Database.1^1","e^^^0"))))/* ERROR #380: Completed but skipped some blocks, details recorded in the console log. */

Which is what I expected.

I have a terminal script that queries sys.process' and then parses the results writing to a logfile. As part of the processing of the results, each row of the result set includes an element from the static string.  But I am not clear on the scoping of the static string. The write statement sees the static string as undefined. What I want is something to the affect:

     set statStr = "aa|bb|.."

   set sqlStatement = xxx

   set tState  = ##class(%SQL.Statement).%New()

   set qStat   = tState.%Prepare(< sql statement> )

   set rset    = tState.%Execute()

  WHILE rset.

When overwriting the Read method (that has a %CacheString return type) on a new class that inherits %Stream.FileCharacter class, returns an error about incorrect return type, must be Binary, even if it matched the real signature.

Looking at the compile global information we can see:

^oddCOM("%Stream.FileBinary","m","Read",42)="%Library.Binary"

After further investigation we realise that there is a generator method looking at the OdbcType class definition.

Setting LONGVARCHAR results in:

^oddCOM("User.CStream","m","Read",42)="%Library.String"

Since I saw many posts on Developer Community related to Python, and the very good articles and application written by @Eduard Lebedyuk I was wondering: "As a Object Script developer, why would I want to use an other  language in Object Script? If I ever need to execute something in Object Script, I would do it in Object Script!".

I thought those functionalities to use other languages in Object Script were made only for other languages developers who have to write Object Script code.

Recently I had to parse a huge CSV file : 1.7Gb and more than 5 millions lines.

Hi,

What is the difference between $Increment and $Sequence functions ?

Thanks

I have an ObjectScript class with a Log property of type %Stream.GlobalCharacter.  I need to search the end of each of the logs - is there a way to extract the last 10 lines of the Log stream for each object via SQL? Or is my only option to write an ObjectScript routine to walk the table and inspect each Log property one by one?

Thanks!

The goal is to construct a comma separated string, using a loop but the same way $listtostring(var,",") would do (i.e. "a,b,c,d,e,f,g,h" without starting or ending comma).

What is the best way to do it, concerning the readability of the code and its performances?

To do so, there are more than 5 methods, but in this example we will test 4 :

1) using a "if" in the loop

set str=""
for ... {
    if str'="" { set str = str_"," }
    set str=str_myval
}

2) using a set

set (str,sep)=""

Hello everyone
I use cache script, I would like to know from you if there is any function or class in the cache where I can get the start and end date of a given month:
Example: What is the first and last day of the month of February 2015.

Grateful.
Davidson

Hello,

When using GetFieldStreamRaw(), by passing in a variable instead of using an output for the Remainder, will this affect how it is stored into a segment in a cloned message? I know it would usually output the remaining fields of the segment but in order to conform to a supplier's spec, they'd require "^^PDF" rather than the rest of the segment. Because the segment becomes immutable, the code below seems to be the way to do it.

Does anyone know how to set an email as High priority when it is sent using a %Net.MailMessage object?  Somehow I can't seem to put my finger on it.

Thanks!

Hi,

I'm processing POP3 emails using the standard EnsLib.EMail.InboundAdapter adapter and %Net.MailMessage. I'm basically processing documents that are attached to received emails. This works fine if the document is simply attached to the email itself. But some systems are sending documents that are attached to an attached email which has content-type = message/rfc822.

How do I get the attached file from the attached email?

I'm using the following code to iterate through the email parts.

Hello Everyone

I am new to cache. I know there are 2 types of methods in cache. One is Instance method (Which can be call through object creation of particular class) and other is Class methods (which can be call through ##Class(MyPackage.Car).CarModels()). 

I want to know the difference when to create a instance method vs when to create a class methods.

Thanks in advance!!.

In Java we can use reflection to get the method arguments in an array, we can also get the name of argument. 

Do we have similar features in ObjectScript? 

Thanks! 

Our client is a UK-based company with subsidiary operations in the USA, France, Germany and China. The Company supplies materials which are used for research, development, and specialised manufacturing applications worldwide. The Business Intelligence department is a small but integral part of the company. The department provides support to the wider business through information systems. We are currently seeking a Business Intelligence Caché Specialist that will be responsible for supporting and developing the existing Caché system, which is used widely within the business.

Hi Community,

Enjoy watching the new video on InterSystems Developers YouTube:

⏯ Visual Studio Code for ObjectScript: Server-Side Source Control

After linking in Oracle Table with Field Column's Data Types of NUMBER, my updates into these table fields are resulting in data that is being rounded to 2 decimal places. I insert a record with 1234.1234 and 1234.12 is stored.

It appears Cache xDBC might be manipulating my values prior to sending to Oracle. Is there a setting or system parameter that is controlling this? If so, is there a way to relax this from occurring so the values I send are being stored in Oracle with the same values?

Hey Developers,

New video is already on InterSystems Developers YouTube:

⏯ Visual Studio Code for ObjectScript: Choosing an IDE/Source Code Combination