Transaction rollback not working

[sienic]

Sometimes I want to test a query on my dataset, and rollback after inspecting its results.
Unfortunately, the following query when executed with ejc-sql, does not rollback the transaction.

Could you point me if this a bug, misusage from of the library, or simply a desired outcome?
If this is a bug, I am happy to investigate and provide a solution, but I want to get first your thoughts on this.

Thanks.

Steps to reproduce:

• ejc-sql: 0.4.1
• Emacs: 28.0.90
• postgres driver: postgresql-42.3.3.jar
• Execute the two blocks sequentially with C-c C-c (ejc-eval-use-sql-at-point)

(postgres example)

CREATE TABLE test (id BIGINT, field VARCHAR);
INSERT INTO test(id, field) VALUES (1, NULL);
/
BEGIN;
UPDATE test SET field = 1234 WHERE id = 1;
SELECT field FROM test WHERE id = 1; -- returns 1234
ROLLBACK;
SELECT * FROM test WHERE id = 1; -- returns 1234, whereas it should return null
/

[sincebyte]

Maybe case every single statment be executed within an independent transaction