Could you create a sample app demonstrating this failure and attach it
to CAY-105 issue. I tried quiet a few different things, like compound
PK, relationships based on CHAR and DECIMAL columns, etc., but could
never reproduce this problem - prefetching just works for me.
On Mar 9, 2004, at 10:48 AM, Andrus Adamchik wrote:
> Hi Tore,
> Thanks for reporting this issue. I just opened a ticket for further
> On Mar 9, 2004, at 4:47 AM, Tore Halset wrote:
>> I tried to upgrade from 1.0.6 to 1.1M4 in our main application now.
>> Prefetching does not seem to work..
>> One example. We have a table called "cell" with "cell_id" (char(8))
>> as primary key. Another table is called cell_coverage and has a
>> compound primary key that consist of "cell_id" (char(8)), "area"
>> (int) and "coord_id" (decimal). There is a one-to-many relalationship
>> between cell and coverage.
>> The code:
>> SelectQuery q = new SelectQuery(Cell.class);
>> // does not work after upgrade to cayenne-1.1M4 :(
>> This is the output for a query on cell with prefetch on cell_coverage.
>> 10:36:20,962 INFO [QueryLogger] --- will run 2 queries.
>> 10:36:20,963 INFO [QueryLogger] --- transaction started.
>> 10:36:21,028 INFO [QueryLogger] SELECT t0.CELL_ID, ...<other
>> fields>... FROM CELL t0 - prepared in 50 ms.
>> 10:36:22,187 INFO [QueryLogger] === returned 1631 rows. - took 1222
>> 10:36:22,201 INFO [QueryLogger] SELECT t0.AREA, t0.COORD_ID,
>> t0.LATITUDE, t0.LONGITUDE, t0.CELL_ID FROM CELL_COVERAGE t0 -
>> prepared in 12 ms.
>> 10:36:23,880 INFO [QueryLogger] === returned 15877 rows. - took 1692
>> That looks correct for me. Every cell_coverage should be in the cache
>> and nothing should be a fault.
>> The problem is that when I loop the cells to print out the coverages
>> cayenne-1.1M4 fetches the coverages once more. This will currently
>> leed to 15877 extra roundtrips to the database...
>> 10:36:28,109 INFO [QueryLogger] --- will run 1 query.
>> 10:36:28,111 INFO [QueryLogger] --- transaction started.
>> 10:36:28,113 INFO [QueryLogger] SELECT t0.AREA, t0.COORD_ID,
>> t0.LATITUDE, t0.LONGITUDE, t0.CELL_ID FROM CELL_COVERAGE t0 WHERE
>> (t0.COORD_ID = ?) AND (t0.AREA = ?) AND (RTRIM(t0.CELL_ID) = ?)
>> [bind: 17210, 0, 'XX121212']
>> 10:36:28,175 INFO [QueryLogger] === returned 1 row. - took 63 ms.
>> This did not happen before I upgraded from cayenne-1.0.6 to
>> - Tore.
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