0002746: Amber setMaxResults

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Category

Severity

Reproducibility

Date Submitted

Last Update

0002746

[Resin]

minor

always

06-23-08 09:09

06-23-08 15:37

Reporter

ferg

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

3.1.6

Summary

0002746: Amber setMaxResults

Description

(rep by Riccardo Cohen)
I use javax.persistence.Query to retreive entity beans throught the
EntityManager.
I have to use setFirstResult() and setMaxResults() to implement next
page / previous page functions.
I found 2 strange things about it :

1) setMaxResults does not fix the "maximum number of results to
retrieve" as the docs says, but indeed the last row number to retreive.
Example :

hqr.setFirstResult(50);
hqr.setMaxResults(60);
gives :
51 : 51 51
52 : 52 52
53 : 53 53
54 : 54 54
55 : 55 55
56 : 56 56
57 : 57 57
58 : 58 58
59 : 59 59
60 : 60 60

2) the LIMIT sql function seems partially implemented. The previous
request calls this :(sql spy=true)

select h.adlid, h.adlfirstname, h.adlname from adluser h order by
h.adlid LIMIT 60

While it should call LIMIT 50,10 (and actually it should call LIMIT
50,60 if you beleive the javax.persistence.Query doc).
It seems that it is the java code that eliminate the 50 first rows.
Imagine I want the rows 10000 to 10005, It seems that the database will
return 10005 rows and the java code will throw the 10000 first

I found nothing about this in recent archives. Thanks for any
information about these 2 topics.
I use Resin 3.1.5 and also 3.2.0 snapshot 18th mai on MacOsX,
the database is mysql 5.0.37 with latest mysql java driver
mysql-connector-java-5.1.6-bin.jar

Additional Information

Attached Files

Relationships

Notes
(0003221) ferg 06-23-08 15:37	jpa/143{0,1,2}

Issue History
Date Modified	Username	Field	Change
06-23-08 09:09	ferg	New Issue
06-23-08 15:37	ferg	Note Added: 0003221
06-23-08 15:37	ferg	Assigned To	=> ferg
06-23-08 15:37	ferg	Status	new => closed
06-23-08 15:37	ferg	Resolution	open => fixed
06-23-08 15:37	ferg	Fixed in Version	=> 3.2.0

Mantis 1.0.0rc3[^]

28 total queries executed.
25 unique queries executed.