Hello, my answers in line along your message ...
Thanks a lot again.

Enrico

Enrico Schenone
Software Architect

Cleis Tech s.r.l. - www.gruppocleis.it
Sede di Genova, Via Paolo Emilio Bensa, 2 - 16124 Genova, ITALY
Tel: +39-0104071400 Fax: +39-0104073276
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E-mail: [email protected]

Il 19/12/24 19:27, Adrian Klaver ha scritto:

On 12/19/24 10:11, Enrico Schenone wrote:

Good day, Adrian.
I get the error inside the program by catching the exception and logging it with diagnostic info provided by the DVM (a runtime interpreter similar in concept to a JVM) that embed the PG driver.

DVM is this?:

https://www.geeksforgeeks.org/what-is-dvmdalvik-virtual-machine/

The 4Js DVM (Dynamic Virtual Machine) is that one https://4js.com/online_documentation/fjs-gas-manual-html/index.html#gas-topics/c_gas_what_is_dvm.html

In other words an Android client?

No, it is a runtime interpreter for Linux, Windows, IBM AIX, macOS and other unix-like OSs. It ensures the portability of 4Js Genero compiled programs (p-code) on several OS platforms.
4Js Genero is a Low Code Application Platform. The programming language, named "BDL - Business Development Language", is an evolution of the Informix-4gl.
Compiled programs needs a runtime interpreter (DVM) to be executed.
The DVM embeds at low-level the DB drivers provided by several vendors, and at BDL high level the application program can easily connect to the major DBs on the market thanks to its ODI (Open Database Interface).

I can't give you info on what the DVM does at low level, but I can send you the distinct full session log fragment at server side, where it is quite easy to understand how the DVM translates the program's SQL queries end what PostgreSQL does.

That might be useful.

Please take a look to the attached text file, that is the full failing session log (filtered from the debug5 PostgreSQL server log).

May I give you any other info ?

Not at the moment.

Do you think it can be useful to include in this thread the 4Js Suppory guys ?

I could see filing an issue and pointing at this thread:

https://www.postgresql.org/message-id/446423eb-4a4e-4135-bbb8-4d0e5c7aac3b%40cleistech.it

Thanks again and best regards.
Enrico