Remove (destroy) all variables in a Qlik Sense application

In QlikView, you had the ability to select multiple variables and delete them en-mass. In Qlik Sense, the UI permits you to undertake this activity one-by-one, and each takes two or three clicks.

This bookmarklet (Chrome only this time, not tried elsewhere) removes ALL variables from a Qlik Sense application by cheating the APIs used by the Qlik Sense client.

Demo showing addition of bookmark and destruction of variables in a Qlik Sense app
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Generating consistent Qlik Sense app icons

Application icons are prominently displayed throughout the Qlik Sense hub, and they are usually either the default blue, or some horrendously stretched icon that has no business being on an enterprise system.

This simple tool (packaged as an extension and accessible as a mashup) helps users generate consistent, appropriate app icons for use in their apps.

Without peering at the text, the default icons are rather generic
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Qlik Sense Repository Explorer (PostgreSQL extractor)

Forewarning – loading data directly from the repository is not recommended. Most requirements can be met through the QRS APIs.

There’s a lot of tables, all qualified – plus an index table. Smart search and insights are recommended!

This script loads all QRS data from the repository into an app. The code is below, or the latest is available on GitHub.

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Get Qlik Sense Object IDs quickly

If you’re doing anything but vanilla Qlik Sense development, it’s likely you’ll need to get to the object IDs at some point. You can do this by appending /options/developer to the end of the page URL and clicking on each object in turn, or using dev tools – but that’s slow.

This bookmarklet makes getting the object IDs fast in Chrome (and, begrudgingly, IE11).

Animated demo showing adding of bookmarklet to chrome and displaying of object IDs
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An example of embedding Qlik Sense (mashup and APIs)

I’m often asked how to create mashups with Qlik Sense, and I strongly believe that it’s both easy and intuitive to leverage Qlik Sense APIs to build mashups…when you understand the options available to you.

To help new developers, I’ve put together a basic mashup using the Material Design Lite template. This example connects to a provided app and demonstrates several different ways of embedding Qlik Sense into a HTML site using just a little Javascript.

The mashup has four pages, one based on the default template and the other three focused on content
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Comparing Autonumber, Autonumberhash128, Autonumberhash256, Hash128, Hash160 and Hash256 outputs in Qlik Sense and QlikView

There’s often a discussion about what each of these autonumber/hash functions does in Qlik. We commonly see these functions used for creating integer key fields, anonymising data (for example, names in demo apps), and maintaining long string fields for later comparison (as the hashes are shorter than the strings they replace).

Sample outputs from the random number generator, with all the functions present

To do this, I’m using the script below. I’m also keen to show outputs from QlikView vs Qlik Sense, and results of running the same script on another machine.

My observations are the following:
AutoNumber/AutoNumberHash128/256 – different output per load as the value is typically based on the load order of the source data
Hash128/160/256 – the same output, across every load. Stays the same between Qlik Sense and QlikView, and also between different machines

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Qlik load performance with RecNo() and RowNo()

Using RecNo() or RowNo() will impart a performance impact on your load script. I discussed these functions in a previous post where I looked at the output of RecNo vs RowNo.

I recently spotted an unexpected slow-down in a load script, which was caused by using one of these functions. In summary:
– Using RowNo() in a simple load script is considerably slower than RecNo()
– If you must use RecNo(), it may be faster to do this in a direct load
– If you must use RowNo(), it may be faster to do this in a resident load

Example script for one of the tests – load data from disk and add the RowNo

 

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Qlik Counter Functions and their outputs – RecNo() and RowNo()

In this post I explore the outputs of RecNo() and RowNo() to demonstrate the difference visually.

These two fields are often used interchangeably, but they provide different output. In summary:
– RecNo() is a record number based on source table(s)
– RowNo() is a record number based on the resulting table

As a result, RowNo will always provide a unique integer per row in an output table, while RecNo is only guaranteed to be unique when a single source is loaded (RecNo is based on each single source table, interpreted individually rather than collectively).

A snapshot of the test output

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Version sheets and tabs in the load script for Qlik Sense and QlikView

In the absence of a source control system like SVN or GIT, a quick and easy way of capturing changes in a app is to update a version control tab before passing the app back to other developers, or onto testers.

This is a very low-tech solution, but the format below works well in shared environments. The first two tabs of your application should be:
– Version (explain the app and list changes you’ve made)
– Config (set the configuration values like paths, dates, etc used in your application’s data load and UI)

Version and Config sheets will become a familiar sight
Version and Config sheets should become a familiar sight

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