Stored Procedures as Source Queries
Instead of extracting data directly from a source query and loading it into a target query, an ETL process can call one or more stored procedures that themselves move data from the source to the target (or the procedures can transform the data in some other way). For example, the following ETL process runs a stored procedure to populate the Patients table.
<?xml version="1.0" encoding="UTF-8"?>
<etl xmlns="http://labkey.org/etl/xml">
<name>Populate Patient Table</name>
<description>Populate Patients table with calculated and converted values.</description>
<transforms>
<transform id="ExtendedPatients" type="StoredProcedure">
<description>Calculates date of death or last contact for a patient, and patient ages at events of interest</description>
<procedure schemaName="patient" procedureName="PopulateExtendedPatients" useTransaction="true">
</procedure>
</transform>
</transforms>
<!-- run at 3:30am every day -->
<schedule><cron expression="0 30 3 * * ?"/></schedule>
</etl>
Special Behavior for Different Database Implementations
