#SQL

Let's start with a simple motivating question: over the past 14 days, what are my most common errors in the Application Error Log?

Migrating from Oracle, MSSQL, or other purely relational database systems to a multimodel InterSystems IRIS is a strategic decision that requires careful planning and execution. While this transition offers significant benefits, including enhanced performance, scalability, and support for modern architectures, it also comes with challenges. In this article I will highlight some of the considerations connected to coding to ensure a successful migration. I will leave everything connected to an actual migration of structures and data outside the scope of this article.

First, when you're considering migrating to a different database system, you need to understand your business logic, whether it's on the side of the application (application server) or the database server. Basically, where do you have your SQL statements that you will need to potentially rewrite?

Like many others probably find themselves, we were stuck doing live data mapping in our Interface Engine that we really didn't want to do, but had no good alternative choice. We want to only keep mappings for as long as possibly needed and then purge expired rows based upon a TTL value. We actually had 4 use cases for it ourselves before we built this. Use cases:

First time trying to use Foreign Tables/Servers instead of Linked Tables...

Within the SQL Editor inside of the Managment Portal, or connecting through DBeaver JDBC how we can see what Foreign Servers have been defined? Is there a way to query and verify structure of the Foreign Server connection to know that we are building the correct Foreign Tables?

I attempted to create my first Foreign table but it failed when I tried to query the tables because it said the table could not be found. But when I sign into the Database via SQL Management Studio, I can see the table.

I have issue with one of my queries. That query work fine for ages, but suddenly stop works and giving me SQLCODE 100 in the routine.

Hence the question: is there a way to do that?

The goal is to get data (from half a thousand to 3-4 thousands lines) from DB, calculate standart deviation then use it as logical condition in analyzer.

For example IF std > custom_value = show_the_result ELSE null

There is a STDDEV(MDX) method used in Analyzer but it is a measure and it can not be used as logical condition (correct me if i am wrong)

I am using a JDBC connection to MS SQL server to execute a stored procedure to select data and bring it into InterSystems as a EnsLib.SQL.Snapshot. I loop through the EnsLib.SQL.Snapshot using a while loop, but I also want to iterate through the Columns within that Row to do logic.

Is there a way to iterate through the Columns of the current Row of the EnsLib.SQL.Snapshot so I can apply logic/rules for further processing?

Thanks

Scott

I'm playing with some anayltic queries against FHIR server tables. The HSFHIR_X0002_S_Patient.addressCity table contains a lot of cities which names contain german charachers such as ä, ö and ü.

The following query works fine:

select value from HSFHIR_X0002_S_Patient.addressCity

But this one converts city names to uppercase, and characters with umlauts are lost, so instead of "Köln" or "München" I see KOLN and MUNCHEN:

InterSystems FAQ rubric

By default, the order of columns in a table is determined automatically by the system. To change the order, explicitly set the order for each property using the property keyword SqlColumnNumber when defining the class.

Example:

Property Name As %String [SqlColumnNumber = 2];

Please see the documentation below.

Hello,

Is there a programmatic way (in ObjectScript) to determine if a string is an SQL reserved word (aside from using embedded SQL to try to name a property with that string and look for the error :-))?

Thank you,

Jean

i am trying to embed a dynamic SQL into Objectscript code , but the %NEXT() will return 0 , however when i copy the same query and run it in the SQL bit it will give me the result i want
the code :

Does InterSystems IRIS has a MEDIAN (or percentile) calculation in SQL?

Would like to know if there is an alternative or better way to paginate through a dataset using dynamic SQL than what I am using below. The problem is that as the potential pool of data gets larger, this code slows down to the point of not being useable. In analyzing each line of code below, it appears the slow down is related to the initial rset.%Next() iteration. Is there anything available which does not require a subquery/%VID such as a simple LIMIT/OFFSET?

My code is similar to :

s sql=##class(%SQL.Statement).%New()

I'm experimenting with adapting SDA3 object model to store medical data in relational form, e.g.:

class Demo.DemoPatient extends (%Persistent, HS.SDA3.Patient) {}

The HS.SDA3.Patient class has the Aliases property which is a nested collection (list) of objects of type HS.SDA3.Name: