New post

#Caché

57

  

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

Documentation.

Let's say I have this property:

Property FavoriteColors As List Of %String;

I heed to convert it to JSON using SQL or at least without object access (so direct global access).

What's the fastest way to do that?

I thought about JSON_ARRAY and JSON_ARRAYAGG sql functions but they don't do that.

0 5
0 1.2K

Recently, a partner company started to develop an Angular client for their Cache application. Together, we decided to leverage the power of Caché dynamic objects to exchange JSON encoded data between client and server parts. However, we realized that currently there is a gap in Cache JSON implementation that prevents simple use of traditional registered and persistent classes to exposed their data with the same ease as with XML. I wrote a small JSON adapter, that does the job and bridgers the gap. It's purpose is simple expose data described by a regular Cache class in a one-to-one fashion to a %DynamicObject. On the other hand, when a serialized JSON data comes in, it can be easily deserialized into dynamic object and subsequently bound to regular class by the newly created adapter.

13 7
1 2K

Hi All,

I need urgent help,

I want to export the values from Global to CSV file.

Values are in global are :

^Global1(1)="1,2,3,4"
^Global1(2)="5,6,7,8"
.
.
.
^Global1(n)="n,n,n,n"

I want output in CSV File as:
1,2,3,4
5,6,7,8
.
.
.
n,n,n,n

I made a class:

0 5
0 1.9K
Article
· Nov 23, 2017 12m read
Where is my global stored?

It's well-known that namespace global mapping helps us to write code independent on database storage details (Caché instance name, directory path). But sometimes we can face problems accessing an unsubscripted global which has subscript level mapping (SLM) defined. Most of such cases are evident and associated with administrative tasks that should be done on database level, but some of them can confuse even an experienced developer. Just to start:

4 8
0 1.3K

or "Bonus Breakage"

In our last lesson, we added a relationship between 2 persistent classes. We are clearly going to need to start creating REST Services to expose CRUD operations for each of these classes, but before we do that, we should really finish defining our linkages. We added code to our Widget toJSON to spool off related Accessory data, so we should really do the reciprocal and allow Accessories to return all Widgets that are compatible.

3 2
1 1.1K
Question
· Aug 16, 2017
PROTECT error

I try to run below two statements

Set tRS = ##class(%ResultSet).%New("%Dictionary.ClassDefinition:SubclassOf")
​set tSC = tRS.Execute("%Persistent")

and I always get <PROTECT>check+5^%Dictionary.ClassDefinitionQuery.1

The login user is _SYSTEM and should have all the permissions.

I cannot run queries in the $SYSTEM.SQL.Shell(). I would get <PROTECT>%GenerateMetadata+16^%SQL.StatementMetadata.1

However, when I run the query through SMP, everything is fine.

Any idea where could I start to investigate ?

Thanks.

1 5
0 2.5K

or "Didn't you say you would cover Persistent Objects in Part 5, Chris?"

Yes, that was the plan. This is a pretty important topic, so it get's its own Article

Up until now, we've display widget JSON that has been created by a basic loop. Clearly this isn't of much value. Now we have our stack connected together, and we can see that the data is flowing to the Welcome page, it's time to complete the stack and start feeding our service from "real" data.

2 4
0 1.5K
Question
· Nov 16, 2017
Caché service does not start

Help, after a day of coding, I wanted to backup my files. I found out that alle of my 3 instances of caché refuse to start.

the error says: cstart-exe-fout (112 Service for Caché instance did not start).

Is there a way to solve this? (off course the management portal does not work either.)

I think there has been a power interruption as the battery from my laptop does not work, and the power went off before

shutdown.

Thanks in advance!

0 9
0 5.2K

Hello; we have users on the system with cache logins. They have access to a specific namespace, and no access to %SYS of course. I'd like to give each user the ability to change his own password from within our application, using Security.User.PasswordExternal. This only exists in the %SYS namespace, and the average user can't get to it.

Should I give the users access to this column in this table (column Password, table Security.Users)? What about access to the namespace? Is this possible? Has anyone done this before?

Thanks,

Laura

0 10
0 1.1K

Apache Spark has rapidly become one of the most exciting technologies for big data analytics and machine learning. Spark is a general data processing engine created for use in clustered computing environments. Its heart is the Resilient Distributed Dataset (RDD) which represents a distributed, fault tolerant, collection of data that can be operated on in parallel across the nodes of a cluster. Spark is implemented using a combination of Java and Scala and so comes as a library that can run on any JVM.

11 5
1 2.6K
Article
· Jun 12, 2017 1m read
Setting the Windows service account

I recently helped a site investigate a problem that appeared after they upgraded their Windows instance of Caché from 2015.1 to 2017.1. A terminal session launched from the server's desktop cube was unable to run OS-level commands using the $ZF(-1) function. For instance, using the no-op command "REM" as follows:

write $zf(-1,"rem")

was returning -1, indicating that the Windows command could not be issued.

8 6
1 1.5K

This is the first article of a series diving into visualization tools and analysis of time series data. Obviously we are most interested in looking at performance related data we can gather from the Caché family of products. However, as we'll see down the road, we are absolutely not limited to that. For now we are exploring python and the libraries/tools available within that ecosystem.

9 4
1 1.5K

This series of articles aims to address the following topics:

  • Creation of a web application based on REST pages;
  • Overview of some tools for tracing (debugging) HTTP requests;
  • Switching from hyperevents to... hyperevents;
  • Integration with jQuery File Upload;
  • Conversion of JSON from the {id:1,parentId:1} format to the {id:1,children:[{}]} format for tree visualization;
  • Integration with jQuery EasyUI (using datagrid and tree as examples);
  • Other topics.

5 1
1 935