#Caché

Cache tricks

Several years ago, long before Developer Community Portal was launched, I published a series of Caché tricks at one of Czech web sites. In this article, I’m posting translated version of one of them.

Capturing output of someone else’s methods or routines

Suppose you, or someone else created a useful method or routine, that was producing some computation that you’d like to benefit from, but the routine was writing output to process principal device.

You would like to use the data, but you need it not written to a device, but assigned to a variable. And, for any reason, you can’t modify the code. What can you do?

Hi,

I want to create a table with a dynamic display of data using the DataGrid.

On the page there  dataCombo and the table.

According to the plan, when the user selects an item in dataCombo the table is filled with data. If select another item - data is updated.

But in fact, the data in the table are loaded once when the page is loaded, and when I select value in DataCombo, I receive an error:

I would be happy if you tell me how to fix it.

Thank you.

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.

Today I'm releasing a new EWD 3 module - ewd-feder8.

ewd-feder8 is a federation or integration platform, built as an extension of the EWD 3 ewd-xpress module.  So what does it do and what's it for? 

It's all about federating and integrating multiple web or REST service end-points.

At its simplest you can use it as a proxy server in front of a remote web service or REST end-point.

Hello, has Cache built-in function for converting hexadecimal number to decimal? 

I am building a SOAP service using Caché 2016.1.  

If I set %session.Preserve=1 in OnPreWebMethod and I set a variable in my service method, why don't I see the variable in the CSP session processes' variables after I call the method?  

The documentation says "The original motivation for the provision of a state-aware mode of operation was to make it relatively easy to migrate legacy application code from a fixed client-server environment (e.g. terminal applications) to the web. Support for transactions that spanned several HTTP requests was also a consideration in its introduction."

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. 

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.

Hi,

I am new to Cache and I am trying to convert a JSON string (msgdata) that contains a JSON payload to an object to be saved into a Driver. Entity table.  I am running into 2 issues and would appreciate any help:

1) It seems that when the 1st element of a list within the payload (Choices) is an empty string, after I call %ConvertJSONToObject, the obj.%data("payload").Choices contains just 1 empty element, removing the next 3 valid values (10,20,30). The same does not happen if I change the input to [10,20,"",30], in this case it works correctly.

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? 

Hello,

How to get XML subtree from XPATH.DOMResult object as Stream or CacheString.

Here is my classmethod. My system receives XML message which has nested structures. The requirement is to send one message at a time to the destination. I have created the XPATH document and used EvaluateExpression method and which returns XML.XPATH.Result of type DOM. I am able to read the dom and get value of the element and its text. But I am looking to send back the subtree.

Code:

I want to query the cache database for messages where a specific HL7 segment equals a specific value. Does Cache have a pipe to XML or hl7 segment query function?

I have a Zen Mojo application, developed using Bootstrap plugin and using "Explicit Dispatch" with multiple templates.

I have every template representing an specific area of my application (customer, order, logon, application settings, etc.). 

Each template has specific code,  client side validation and so on related to its areas by using javascript.

So, I would like to know if it is possible, for example, through my order template call a javascript function from another template (e.g.: customer), where I there is functions for document id validation, date of birth validation, etc.?

Thank you.

I have two pages and I am using the push and pop to go and back navigation. When I click the button forward and back in the browser, I can't navigate more between pages.

The following code:

Page 1 - onSelect Method:
var obj = {idExame: VALID, objUsu: ObjUsu};
zenPage.gotoArea ('itemexames', key, key, false);
view.pushDocument (key, obj, key, obj);

Page 2 - onSelectMethod, back:

var documentKey = "PacienteExamesinitial";
var layoutKey = "PacienteExamesinitial";
var area = "pacienteexames";

view.popDocument ();
zenPage.gotoArea (area, layoutKey, documentKey, false);

I am using ZenMojo with Bootstrap.

I don't know if this is the proper section to post this kind of issues, but in the learning tracks for Zen I'm not able to play the second video (Caché Demo - Part 5 - Building a Rich Web Interface with InterSystems Zen) , the player show the following error message:

No video has been loaded

Error Code: PLAYER_ERR_NO_SRC

Learning Trak Link:

https://community.intersystems.com/learning-track/zen-videos 

I am looking for a database management tool I would have expected to find something like on the SMP website

Aim

show current database usage (ie size allocation) by database then table etc and allow continued drill down,

show information as a table, so can then sort by size to find the biggest item easily

also show it graphically

And then have ability to track and trend growth in size over time

identify a normal growth pattern

alert if variation (higher or lower) from normal based on recent trend

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

 set rtn = ##class(%RoutineMgr).%OpenId("les.mac")
 w rtn.Code.WriteLine("some text")

It says that status is 1, but I don't see any difference in my source file.

Is there any way to overwrite source files, not only .mac but .cls, .int, .dfi?

I'm new to Cache and trying to follow the Using Cache Studio PDF. In section 2.4.3(Adding a Zen form) it tells you insert the following code;

<button caption="Save" o select="zenPage.saveRecord();" />

Unfortunately that code fails compilation. If you try and use the tools there is no o select option nor a select or onselect option. I was wondering if anyone has used this PDF before and knows what the correct attribute should be?

Customer is experimenting with %vid variable for selecting row numbering for sql queries. Basically he's trying to implement paging functionality.

He is confused that select %vid from (select ...) returns dummy number whilst select *,%vid from (select...) returns correct data.

I have the following problem:

• There are several classes with method generators, which needs to be compiled during every compilation
• I have "ckub" qualifiers enabled in studio
• I don't want to remove "u" qualifier because I need it very much in another namespaces

So how do I force classes with method generators to recompile when "u" qualifier is present?

NewBie's Corner Session 13 .MAC and .INT Routines and Comment Lines

Welcome to NewBie's Corner, a weekly or biweekly post covering basic Caché Material.

.MAC and .INT versions of Routine

Save Routines with a .MAC Extension

NewBie's Corner Session 3 More Read and Write commands & Multiple commands

Welcome to NewBie's Corner, a weekly or biweekly post covering basic Caché Material.

Click on the Caché Cube in your system tray and select Terminal to try out the commands.

Write command with carriage return and line feed

When the exclamation point "!" is inserted after a Write command, a carriage return and line feed combination is produced. Note in this example, that a comma separates the exclamation point from the variable "X".

Set X=12

Write !,X

Hello, everyone!

I opened one project and there I found such lines as 

$$Export^%occXMLExport(filename,"-d /diffexport",InternalName)

Do DecomposeStatus^%apiOBJ(sc,,"d")

The problem is I can't go to their definition and find them in documentation. It says that they don't exist on the server. However, the project works and these routines execute. 

How can I import them into my project? 

InterSystems is pleased to announce that Caché and Ensemble 2015.2.4 are now available as maintenance releases.

For a complete list of the corrections in 2015.2.4, please review the release notes. 

Caché and Ensemble 2015.2.4 are available for the same platforms as 2015.2.3, with this exception:

• Red Hat Enterprise Linux 7 for Power System-64 has been dropped.

The complete set of supported platforms, including specific point releases and patches, is detailed in the Supported Platforms document.

The build corresponding to this release is 2015.2.4.903.0

We can override soap body by using WriteSOAPBodyMethod. Something like:

Method Online(ByRef Obj1 As myClass1, Obj2 As myClass2, Output ObjOutput1 As myClass1Output(XMLNAME="Obj")) [ ..., WebMethod ]

{

              …

              s ..WriteSOAPBodyMethod="override"

              d (..WebMethod("Online","ProcessRequest")).Invoke($this,"Online",.Obj1,.Obj2,. ObjOutput1)

              s ..WriteSOAPBodyMethod=""

              …

}

Method override(proxy As %SOAP.ProxyDescriptor, tag As %String)

{

              …

}

In order to generate soap body, how can one  access  Obj1 and Obj2 from within the override method?

Hello,

One of our AP would like us to provide the file upload/download sample code by using ZEN Mojo.

I already provided them the attached "upload-sample".

I tried to create the "download-sample" in a similar way, but I couldn't do it yet.

Does anyone have a good idea/sample about this?

I'd like to download the server side file(e.g. c:\temp\nene.jpg) into client machine with a OpenFileDialog(image.png).

Thank you in advance.

Hello, guys!

I want to get access to the folder where all files of the namespace are stored using COS. I found a way to get access to class files and found a folder where all csp, html, css etc files are stored.

However, is there any folder which contains all files(even .mac and .int)?  

Or, probably, there is a method which gives all files content?