This topic is under construction for the 17.3 release of LabKey Server. For current documentation of this feature, click here.
Suppose you wanted to expand the Patients
dataset to also include male participants who are "Natural Controllers" of HIV.
To do this, we add a SQL query
that returns a selection of records from the Demographics table, in particular all Male participants who are Natural Controllers.
And we'll create a new ETL process from scratch, drawing on the new SQL query.
Create a New Source Query
- Locate the source code for the ETL module. Depending on where you deployed it, go to either <LABKEY_HOME>/externalModules/etlmodule or <LABKEY_HOME>build/deploy/modules/etlmodule.
- Within that folder, go to the subdirectory ./queries/study.
- In that directory, create a file named "MaleNC.sql". Note: our sample includes this file with the extension ".sql-removeToUse" if you prefer to simply rename it instead of creating it anew.
- Open the file in a text editor and copy and paste the following code into the file:
WHERE Demographics.Gender = 'm' AND Demographics.TreatmentGroup = 'Natural Controller'
- Save the file.
- Restart the server.
- Log back in as an administrator and return to the "ETL Workspace" folder.
Create a New ETL Process
ETL processes are defined by XML configuration files that specify the data source, the data target, and other properties. Here we create a new configuration that draws from the query we just created above.
- In the etlmodule/etls directory, create a new XML file called "MaleNC.xml".
- Copy the following into MaleNC.xml, and save. Note: Again, you can instead simply remove "-removeToUse" from the file included with our sample."
<?xml version="1.0" encoding="UTF-8"?>
<name>Demographics >>> Patients (Males)</name>
<description>Update data for study on male patients.</description>
<source schemaName="study" queryName="MaleNC"/>
<destination schemaName="study" queryName="Patients" targetOption="merge"/>
- Notice that this configuration file has our query (MaleNC) as its source, and the Patients query as its target.
- Refresh the browser. Notice that the system will add your new module to the server. Click Next if necessary to complete the update.
- In the "ETL Workspace" folder, notice our new ETL process is now listed in the Data Transforms web part.
Run the ETL Process
- Click Run Now next to the new process name. You will need to have signed in to see this button.
- Refresh in the pipeline window until the job completes, then click the ETL Workspace link.
- New records will have been copied to the Patients table, making a total of 43 records (42 if you skipped the step of changing the gender of a participant in the source data during the previous tutorial step).