Bugs item #937767, was opened at 2004-04-19 12:54
Message generated for change (Comment added) made by loubyansky
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=376685&aid=937767&group_id=22866
Category: JBossCMP
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Micah Spears (lamarguy)
>Assigned to: Alexey Loubyansky (loubyansky)
Summary: left-join descriptor is problematic
Initial Comment:
I applaud the new the left-join read ahead option but
the xml descriptors in jbosscmp-jdbc.xml are difficult
to configure. reasons for descriptor change are:
1.) for each query I wish to left-join, I have to
specify the cmr fields each time which leads to
redundancy. grouping the joins is more logical like
load-groups are handled.
2.) writing xdoclet support is non-trivial for the
current left-join descriptors.
so I propose the syntax change from, for example,
<read-ahead>
<strategy>on-find</strategy>
<eager-load-group>report</eager-load-group>
<left-join cmr-field="lineItems"/>
<left-join cmr-field="product"
eager-load-group="short"/>
</left-join>
<left-join cmr-field="customer"
eager-load-group="basic"/>
</read-ahead>
to
<read-ahead>
<strategy>on-find</strategy>
<eager-load-group>report</eager-load-group>
<left-join-group>group_a</left-join-group>
</read-ahead>
<left-join-groups>
<left-join-group>
<name>group_a</name>
<description>example left join group</description>
<left-join>
<cmr-field>lineItems</cmr-field>
<left-join>
<cmr-field>product</cmr-field>
<eager-load-group>short</eager-load-group>
</left-join>
</left-join>
<left-join>
<cmr-field>customer</cmr-field>
<eager-load-group>basic</eager-load-group>
</left-join>
</left-join-group>
</left-join-groups>
in addition, maybe "left-join" should be renamed to
"relation-join" for clarity.
----------------------------------------------------------------------
>Comment By: Alexey Loubyansky (loubyansky)
Date: 2004-04-20 19:35
Message:
Logged In: YES
user_id=543482
This is not a bug. I reposted this to the forums. Let's
discuss it there. Thanks!
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3831614
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