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#SQL

16

SQL is a standard language for storing, manipulating and retrieving data in relational databases.

Hey Community,

Don't miss the latest videos on InterSystems Developers YouTube channel:

⏯ IntegratedML Update from the Field

https://www.youtube.com/embed/2-i2Z7aukSc
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Article
· Jan 2, 2022 3m read
DB Migration using SQLgateway

Thanks to @Yuri Marx we have seen a very nice example for DB migration from Postgres to IRIS.
My personal problem is the use of DBeaver as a migration tool.
Especially as one of the strengths of IRIS ( and also Caché) before is the availability of the
SQLgateways that allow access to any external Db as long as for them an access usinig
JDBC or ODBC is available. So I extended the package to demonstrate this.

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2 595
Question
· Jun 1, 2022
Cache Query for HL7 NACK

I would like to capture any NACK's that is sent back to the Operation. The Operation is already setup to "Save Replies/IndexNotOK's", but I would like to see if we can query Cache and pull those NACK's into an extract.

Is this possible?

Thanks

Scott

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Hey Developers,

See how you can get high-performance relational access using SQL to manage data within your InterSystems products:

⏯ Using SQL with InterSystems IRIS

https://www.youtube.com/embed/7l-YT5y-nJo
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Hi,

We need a web-based SQL tool to connect to Ensemble/Cache, that will offer more functionality than what the Management Portal offers.
It needs to be web based, so that we can host it on a machine that has connectivity to the server via the superserver port. We (the devs and support) only have browser access to the environment via Remote Desktops, hence the requirement.

Has anyone gotten OmniDB to connect to Ensemble/Cache? If so, can you please advise on how to configure it?

Any other suggestions for such a tool are also welcome.

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Hi folks!

Sometimes we need to import data into InterSystems IRIS from CSV. It can be done e.g. via csvgen tool that generates a class and imports all the data into it.

But what if you already have your own class and want to import data from CSV into your existing table?

There are numerous ways to do that but you can use csvgen (or csvgen-ui) again! I prepared and and example and happy to share. Here we go!

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Question
· Jul 17, 2018
Cache Dynamic SQL Pagination

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()

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Hi,

Is there a way to find the median in Intersystems Cache SQL? I know it is not available as an aggregate function. Also in SQL Server I could try something like: 

SELECT
(
 (SELECT MAX(Score) FROM
   (SELECT TOP 50 PERCENT Score FROM Posts ORDER BY Score) AS BottomHalf)
 +
 (SELECT MIN(Score) FROM
   (SELECT TOP 50 PERCENT Score FROM Posts ORDER BY Score DESC) AS TopHalf)
) / 2 AS Median

However, there is no PERCENT Keyword in Cache as well. Any suggestions?

Thanks

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Hi,

I'm very new to InterSystems Health Connect so may be doing something silly...

I'm trying to link to an Oracle DB view using the Link Table Wizard in the Management Portal. The wizard finds the view, but when I select it and click the 'next' button I get an error on the 'Select Columns' screen: 'ERROR #5534: Columns error' (and no columns show in the wizard). I've tried on several views and tables in the same DB but keep hitting the same error.

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Question
· Apr 25, 2022
Run multiple Update sql queries

Hi everyone, how do you run multiple quires?

I have tried couple of different ways, but not working.

SET sql = 2

Set sql(1) = "UPDATE QUERY"

Set sql(2) = "UPDATE QUERY"

Set sqlStatement=##class(%SQL.Statement).%New()

Set sc1=sqlStatement.%Prepare(.sql)

If $$$ISOK(sc1) {

Set tResult = sqlStatement.%Execute()

}

else{

$$$LOGERROR("Failed")

}

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A question has come up that I am not finding the answer for.... Does the daily purge process re-index EnsLib.HL7.SearchTable or other SQL tables? In looking at the purge process documentation I am not seeing anything that mentions EnsLib.HL7.SearchTable. Do we have to manually constantly re-index tables that we create? For example I created another search table based off of EnsLib.HL7.Search table, will I need to constantly watch this as it grows? How do tables get index, is there some kind of mechanism that automatically does it, or are we responsible for indexing tables ourselves?

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Hi!

I'd like to know if there are any issues if an index is inserted into a table without running the %BuildIndices() method.

It's important to note that data inserted before the index is not important for retrieval, so it's not a problem data inserted before the index don't show up in queries.

The reason why I'm asking this is that I'd like to avoid index reconstruction on big tables which I need to inser such index.

I'm using Cache 2018.1.

Thanks,

José

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Question
· Mar 18, 2022
EnsLib.HL7.Message Querying

We are trying to track down the source of Orphaned messages and noticed that we are unable to query EnsLib.HL7.Message with any kind of WHERE or ORDER BY clauses in our SQL statement.

I know EnsLib.HL7.Message is a system table, but is there a way we can add additional Indexes to the table to make the query run better/faster without affecting the system?

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Question
· Mar 15, 2022
How to use LOAD DATA

How do I use the LOAD DATA command as described here.

I have the following LOAD DATA statement:

LOAD DATA FROM FILE 'E://Temp/Values.txt'

into PARIS.UAGU_MNDOOUT1 (AHSU_ID, AHSU_UAG_ID)

Where do I run it? It doesn't work in the SQL Gateway, in the terminal, in an embedded SQL command.

What am I missing?

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Hi Community,

New video is already on InterSystems Developers YouTube:

⏯ Poor Man's Analytics with Rich SQL

https://www.youtube.com/embed/gDI2yqvExEc
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I'm new to cache, come from an oracle and sql server background. In oracle and sql server I could write basically a stored procedure like script and pass it in as text to the command to execute.

Example:

Below would be the _sqltext

DECLARE @Id INT;

select id into @Id from something;

if @Id = 9

BEGIN

do something

END

The _sqltext would work in sql server, what would be the equivalent for cache for it work?

I get a generic error when I try it with cache

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