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#Caché

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InterSystems Caché is a multi-model DBMS and application server. See more details here.

Documentation.

I have a persistent class where I am logging each CCDA I receive. I want to store all of the providers associated to that CCDA (many to one). In a relational database, I would have a child table with a foreign key to the primary table. I'm guessing the equivalent to Cache would be

1. Create a custom class (ProviderList) with the properties I want to store.

2. Add the class as a property of my CCDA persistent class.

Property Providers as Array of ProviderList (SQLProjection = "table/column";

Am I on the right track?

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Question
· Oct 17, 2016
Are we using callin API?

Hello community; this may seem odd, but I need to know if there's any way we could be using callin functions from a C application without knowing? e.g. if other developers created some C programs that call in to Caché that we don't realize are running. Is that possible? If so, where would I look to see these programs? Perhaps the server's task manager?

Thanks --Laura

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Here you have an easy way to write and execute COS code from your unix scripts. This way one does not need to write routines or even open Studio or Atelier. It can be an option for simple and small actions for instance things like installation tasks or compiling.

See sample bash script (compile.sh) to compile classes:

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At Global Summit back in April, in his keynote speech, John Paladino mentioned that improvements to our documentation search were being made. You might have wondered, since things seemed to go quiet, whether anything was really happening. Well, we had an internal demo of some of the upcoming features recently, and the new capabilities look really cool – searching documentation has been frustrating for InterSystems staff too! So, I thought it might be good to pass on a few details to give a taste of what is coming. Of course, InterSystems will be putting together much better information

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Interesting anecdote I want to share. Not 100% Caché related, but I hope it would be useful.

When CSP Gateway is configured on IIS, opening CSP Gateway Configuration page is prohibited by default -- as IIS blocks URLs with '/bin' in it.

In our documentation we advise to add <remove segment="bin" /> to applicationHost.config file.
That is correct.

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Question
· Oct 11, 2016
Cache deleting users

Very new to this side of cache....

So, currently in the habit of keeping all users forever, up to over 5000... ? is what if we decided to start deleting old users who have been gone from the company, how would it affect any account level information? notes, payments etc.... Is there any documentation anywhere that would answer this or describe this process or maybe best practices??

Sorry if this seems stupid but i am working on a proof theory for work.

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The goal of this writing was to illustrate how to restore backup before the patch would be applied. The alert notes that:

The risk can be avoided by applying journals from the beginning of the journal file that was switched to at the start of the backup, rather than accepting the default of starting from the journal marker position.

Having non-patched Caché 2015.1.4, I ran sample database backup and restore just to get where I should answer "No". Collecting journal info from the backup log:

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Article
· Dec 4, 2015 3m read
Atelier Beta Cloud Infrastructure

A few people wrote to me asking about the infrastructure behind the Atelier Server implementation. Its neat and a worthwhile story to share so I am writing it up here as a post on the community. I want to go in to a little detail on why it was needed and then I will outline in detail how we went about implementing this.

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This text is a continuation of my article where I explained the structure a Caché database. In this article, I described the types of blocks, connections between them and their relation to globals. The article was purely theoretical. I made a project that helps visualize the block tree - and this article will explain how it works in great detail.

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Question
· Oct 10, 2016
PDFs from COS

We have a very old green screen application which is currently producing PCL "documents". I want to update this to produce PDFs - are there any shortcuts / tips? I'm aware Zen Reports can allegedly do it, but I want to avoid that route if I can.

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I experience this constantly with Cache SQL. Especially when querying the ATNA log.

SELECT TOP 400000 * FROM HS_IHE_ATNA_Repository.Aggregation ORDER BY ID DESC

That took 12 seconds. I then upped the number to 500,000 and it took 185 seconds.

Shouldn't the execution time scale proportionately?

If I run the 500,00 query again it takes 2.4 seconds.

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Article
· Oct 4, 2016 1m read
How to Parse a URL in Caché

How to parse a URL in Caché:

Let's pretend you are working on a project where you may be retrieving a URL for some purpose and you have the need to be easily able to parse apart that URL to get the various components that make up the URL.

Here's how to do that:

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Hi


I have been working on changing a web application from using %FileBinaryStream to storing and serving the file content from a %Stream.GlobalBinary property, stored in a new database. I have managed to migrate the data across, and have also been able to redirect the stream so that it is being served through the web link. However, the previous method set attributes on the File stream to have the stream be rendered as the original file type through MIME, using this code

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Question
· Sep 21, 2016
How to open ms-dos text files

Hi, There

How to use open text file. I have a one file. the file is original file from excels file. After later convert to CSV file.

some cells has include cr+lf control code. If i open and use from cache. reding time,Cache was wrong line feed point.

how do i edit my source code?

==============================================

s infile="c:\csvfile.csv"

o infile:"r"

1 u infile r line i $zeof<0 c infile q

f i=1:1:10 s wd(i)=$p(line,",",i)

g 1

==============================================

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