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Oracle, ADO.NET and column sizes
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  1. Yiannis Papadomichelakis
  2. PowerBuilder
  3. Friday, 11 July 2025 01:34 PM UTC

Hi all!

I am facing a problem where a cursor must contain a column with some JSON content over 4000 bytes. Standard ORA driver does not support retrieval of more that 4000bytes per column, although it has no issues in updating that table.

My first thought was to "try" the ADO.NET driver for Oracle, maybe there are less limitations on that, but I still find hard to make our application work with it.

My current issue is about a function that returns clob. I use the classing DECLARE X PROCEDURE FOR... method and when I use the ORA driver, the function works OK and I got the desired result.
When I use ADO.NET, instead of the expected result, I get "Oracle.ManagedDataAccess.Types.OracleClob", while SQLCode = 0.

So, I have 2 questions:
1) Is it possible to retrieve a datawindow that may have columns with over 4000bytes in size?
2) How am I supposed to use Oracle functions that return clob?

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