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How to use nested UDTs with WSO2 DSS

WSO2 Data Services Server(DSS) is a platform for integrating data stores, creating composite data views and hosting data in different sources such as REST style web resources.

This blog guides you through the process of extracting the data using a data services when nested User Defined Types (UDT) used in a function.

Lets take the following oracle package that returns a nested UDT. When a nested UDT (A UDT that use standard data types and other UDT in it) exists in the oracle package, oracle package should be written in a way that it returns a single ref cursor, as DSS do not support nested UDTs out of the box.

Lets take the following oracle package that includes a nested UDT called 'dType4'. In this example I have used Oracle DUAL Table to represent the results of multiple types included in the 'dType4'.

Sample Oracle Package create or replace TYPE dType1 IS Object (City VARCHAR2(100 CHAR) ,Country VARCHAR2(2000 CHAR)); / create or replace TYPE dType2 IS TABLE OF V…