M3 feature preview

Hi,

I wanted to highlight a few things in the upcoming M3. They are already =
on master, so maybe some brave souls can take it for a spin and give us =
feedback :)=20

1. Cayenne no longer wraps selecting queries (or at least those it can =
reliably identify as selecting) into transactions.=20

I had a suspicion for years that we shouldn't be doing that. Now I was =
able to vibecode real benchmarks on multiple databases, and time savings =
in the JDBC layer with faster queries are about 2x! (as each useless =
"commit" is a separate command sent to DB that needs to be processed). =
But this means that for the first time Cayenne operates with Connection =
"autoCommit=3Dtrue". So I'd appreciate feedback if this causes any =
weirdness with your DataSources.


2. SQL logging changes. There are multiple changes. Some address =
operational concerns (saving hundreds of GB of storage space; =
single-line logs are easier to parse), others are "quality of life":

* No tx for selects (mentioned above) by itself cuts down on 2 log lines =
per query
* The new logger name is short and descriptive "cayenne-sql"
* ERROR log level for queries that result in exceptions
* SQL query logs are single-line. Parameters, timers, result counters, =
generated keys are placed on one line and rendered in a compact format. =
Tx wrapping is still done on separate lines (as a tx can include more =
than one SQL statement)

INFO cayenne-sql tx started
INFO cayenne-sql INSERT INTO BINARY_PK_TEST1(BIN_ID, NAME) VALUES(?, ?) =
| =
bind:[BIN_ID:FBBC4034ED8F0214B2C559CF1029C1868A66F0D59208A36C9365126C248C.=
..,NAME:'master1'] updated:1 time_ms:0
INFO cayenne-sql tx committed

* Mnemonic table aliases. No more meaningless t0, t1, t2:

INFO cayenne-sql SELECT p.ESTIMATED_PRICE, p.PAINTING_DESCRIPTION, =
p.PAINTING_TITLE, p.ARTIST_ID, p.GALLERY_ID, p.PAINTING_ID, =
g.GALLERY_ID, g.GALLERY_NAME FROM PAINTING p LEFT JOIN GALLERY g ON =
p.GALLERY_ID =3D g.GALLERY_ID | selected:1 time_ms:0

* No alias for single-table queries

INFO cayenne-sql - SELECT ESTIMATED_PRICE, PAINTING_DESCRIPTION, =
PAINTING_TITLE, ARTIST_ID, GALLERY_ID, PAINTING_ID FROM PAINTING | =
selected:2 time_ms:0


(I am also thinking of lowercasing the SQL so that logs don't look like =
they are screaming at you :))=20

Andrus

=20