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From "Fay Wang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-407) Cache SQL (or closer precursors to SQL) more aggressively
Date Mon, 28 Apr 2008 22:41:56 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592918#action_12592918
] 

Fay Wang commented on OPENJPA-407:
----------------------------------

You are right that the equals and hashCode are for general purpose. It is risky to have the
special purpose hashCode and equals methods in JDBCFetchConfigurationImpl.  We will move the
hashCode and equals from JDBCFetchConfigurationImpl into the SelectKey class to avoid interfering
with other usage of hashCode and equals. I will post a patch soon with the changes suggested
by Patrick.

> Cache SQL (or closer precursors to SQL) more aggressively
> ---------------------------------------------------------
>
>                 Key: OPENJPA-407
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-407
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc, kernel, query, sql
>    Affects Versions: 0.9.0, 0.9.6, 0.9.7, 1.0.0
>            Reporter: Patrick Linskey
>             Fix For: 1.1.0
>
>         Attachments: findBy.patch, OPENJPA-407.patch, OPENJPA-407.patch, OPENJPA-407.patch,
QuerySQLCache.doc
>
>
> When data is not available in the data cache, OpenJPA dynamically creates SQL to look
up the requested data. OpenJPA should more aggressively cache this SQL to accelerate pathways
from a cache miss to the database.
> The generated SQL takes a number of factors into account, including the requested records,
transaction status, currently-loaded data, and the current fetch configuration. Any caching
would need to account for these factors as well.

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