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The Art of Mapping Globals to Classes (4 of 3)

The forth in the trilogy, anyone a Hitchhikers Guide to the Galaxy fan?

If you are looking to breathe new life into an old MUMPS application follow these steps to map your globals to classes and expose all that beautiful data to Objects and SQL.

If the above does not sound familiar to you please start at the beginning with the following:

The Art of Mapping Globals to Classes (1 of 3)

Last reply 20 July 2020
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Let's say we have two serial classes, one as a property of another:

Class test.Serial Extends %SerialObject
{
Property Serial2 As test.Serial2;
}

Class test.Serial2 Extends %SerialObject
{
Property Property As %String;
}

And a persistent class, that has a property of test.Serial type:

Class test.Persistent Extends %Persistent
{

Property Datatype As %String;

Property Serial As test.Serial;

}

So it's a serial, inside a serial, inside a persistent object.

Last reply 15 July 2020
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The Caché System Management Portal includes a robust web-based SQL query tool, but for some applications it’s more convenient to use a dedicated SQL client installed on a user’s PC.

SQuirreL SQL is a well known open source SQL client built in Java, which uses JDBC to connect to a DBMS. As such, we can configure SQuirreL to connect to Caché using the Caché JDBC driver.

Last reply 21 May 2020
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Class Queries in InterSystems IRIS (and Cache, Ensemble, HealthShare) is a useful tool that separates SQL queries from Object Script code. Basically, it works like this: suppose that you want to use the same SQL query with different arguments in several different places.In this case you can avoid code duplication by declaring the query body as a class query and then calling this query by name. This approach is also convenient for custom queries, in which the task of obtaining the next row is defined by a developer. Sounds interesting? Then read on!

Last reply 22 November 2019
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Date range queries going too slow for you?  SQL Performance got you down?  I have one weird trick that might just help you out! (SQL Developers hate this!)*

If you have a class that records timestamps when the data is added, then that data will be in sequence with your IDKEY values - that is, TimeStamp< TimeStampif and only if ID1 < IDfor all IDs and TimeStamp values in table - then you can use this knowledge to increase performance for queries against TimeStamp ranges.  Consider the following table:

Last reply 6 September 2019
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The select query here "select Settings from Ens_Config.Item" in the SQL Query of management portal returns this: 

ValidationHost 7ActOnTransformErrorHost1 ReplyCodeActionsHostE=D AlertOnErrorHost1 9 AlertGroupsHost$LabAlertGroup,1-CriticalAlertGroup BusinessPartnerHost

How do I isolate just one of the settings e.g. ReplyCodeActions or LocalInterface

For example, i want to search for all entries that have  a value for ReplyCodeActions

I realize i can open the production in studio and search for those setting values.

 

 

 

Last reply 8 July 2019
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Have some free text fields in your application that you wish you could search efficiently?  Tried using some methods before but found out that they just cannot match the performance needs of your customers?  Do I have one weird trick that will solve all your problems?  Don’t you already know!?  All I do is bring great solutions to your performance pitfalls!

As usual, if you want the TL;DR (too long; didn’t read) version, skip to the end.  Just know you are hurting my feelings.

Last reply 10 May 2019
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As we all know, Caché is a great database that accomplishes lots of tasks within itself. However, what do you do when you need to access an external database? One way is to use the Caché SQL Gateway via JDBC. In this article, my goal is to answer the following questions to help you familiarize yourself with the technology and debug some common problems.

Last reply 28 December 2018
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This is a sample Ensemble/Health Connect production which demonstrates how to receive an HL7 order (ORM) inbound from a file, extract fields (in this case, basic demographic information), and insert those into a table in an external SQL database via ODBC.  

Included in the zip file:

  • Exported code
  • Sample ORM message
  • 'How to configure' doc 
Last reply 19 April 2018
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The Art of Mapping Globals to Classes (3 of 3)

 

If you are looking to breathe new life into an old MUMPS application follow these steps to map your globals to classes and expose all that beautiful data to Objects and SQL.

 

If the above does not sound familiar to you please start at the beginning with the following:

 

The Art of Mapping Globals 1

Last reply 2 November 2017
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So just this morning we started to get this error from all of our SQL-client based tools that connect to our Caché SQL via ODBC: 

[%msg: <Error instantiating cached query class in Prepare(): <METHOD DOES NOT EXIST>Prepare+41^%SYS.SQLSRV *%New,%sqlcq>] (State:S1000, Native Code: 190)]

 

No queries work... any help? stumped over here.

 

Last reply 2 November 2017
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The Art of Mapping Globals to Classes  (2 of 3)

 

If you are looking to breathe new life into an old MUMPS application follow these steps to map your globals to classes and expose all that beautiful data to Objects and SQL.

 

This example is going to cram in 4 or 5 different things beyond what was covered in Part 1 

Last reply 23 May 2017
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I have been following the online Zen Quickstart Tutorial using the lastest release documentation. In addition to playing around with the styling and making a few minor functionality tweaks, I wanted to add an additional column that shows a count of the number of phone numbers for that Contact (as shown in the image below).

Last reply 15 March 2017
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So, I played with row level security and was unable to find a way to get to work it dynamically. I want to determine if the user can access the row in runtime based on a state of external system, but it seems that row level access is calculated during INSERT/UPDATE and stored in %RLI index. Is there a way to achieve runtime access calculation?

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We don't often use SQL within our org, which is mostly due to the performance issue we experience due to the quantity of data we are reviewing.

Aside from the standard performance measures for non-Caché databases, are there any recommended approaches when querying large tables?

The table would have roughly 50M records, but there are not a finite amount of sub-nodes.

Last reply 6 December 2016
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Hello Fellow Caché Developers,

The purpose of this post is to ask for everyone's thoughts and input around the use of transient, SQLCalculated/Computed properties within persistent classes.

This approach allows for extra data values needed in SQL queries to be available without having to join to other tables.

Very simple/basic example to illustrate the topic:

Let's say I have a persistent class named ICDAutoCodeDefn to hold ICD Auto-Coding definitions, such as:

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 Error:

    [SQLCODE: <-400>:<Fatal error occurred>]
    [Cache Error: <<SUBSCRIPT>%0AmEdun+4^%sqlcq.HSREGISTRY.cls966.1 ^||%sql.temp(1,"")>]
    [Location: <ServerLoop - Query Fetch>]
    [%msg: <Unexpected error occurred:  <SUBSCRIPT>%0AmEdun+4^%sqlcq.HSREGISTRY.cls966.1 ^||%sql.temp(1,"")>]

 

Here is an example of a query that gives the error:

Last reply 30 November 2016
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I have a class which defines a property as array of %String. Is it possible to index values of this property and use this property in SQL?

I have tried 'Index idx On prop(ELEMENTS)' and then a select from the generated collection table, but this is still orders of magnitude slower than queries to the containing class.

Last reply 30 November 2016
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In writing some code on:

Cache for Windows (x86-64) 2015.1 (Build 429U) Fri Feb 13 2015 14:37:23 EST

I noticed an unexpected "ROLLFAIL" error when a Unique Index fail was generated in a %Save() call.

The object SHOULD fail to save, since the Unique criteria is not met, but I didn't expect to see a ROLLFAIL error as the "Last Error".

When running the following class code:

Last reply 28 November 2016
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I would like to integrate SQL into our ObjectScript routines in order to illustrate how SQL can be used to minimize development time. However, there are two questions I have.

  1. How does one iterate through the results of a SELECT statement?
  2. How does one access a Table in another namespace?
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