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Date: Sat, 23 May 2009 02:33:45 -0700 (PDT)
From: "Milosz Tylenda (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Updated: (OPENJPA-736) Combine insert and select SQL
 together for generated Id strategy=GenerationType.IDENTITY
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     [ https://issues.apache.org/jira/browse/OPENJPA-736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Milosz Tylenda updated OPENJPA-736:
-----------------------------------

    Attachment: supportsGetGeneratedKeys.patch

The attached patch supportsGetGeneratedKeys.patch addresses point 1. The idea is to auto-detect the property only if user did not specify the property value. In order to do that, I have changed the property type from primitive boolean to Boolean. Let me know if anybody sees this problematic.


> Combine insert and select SQL together for generated Id strategy=GenerationType.IDENTITY 
> -----------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-736
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-736
>             Project: OpenJPA
>          Issue Type: Improvement
>    Affects Versions: 1.3.0
>            Reporter: Fay Wang
>            Assignee: Milosz Tylenda
>             Fix For: 1.3.0
>
>         Attachments: openjpa-736.patch, supportsGetGeneratedKeys.patch
>
>
> Currently if the strategy of the generated id is GenerationType.IDENTITY,  when an entity object is created, openjpa will generate two SQL statements. The following is an example running on DB2:
> (1) INSERT INTO EntityA (col1, col2, col3, version) VALUES (?, ?, ?, ?) 
> [params=(int) 1, (int) 1, (int) 1, (int) 1]
> (2) SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1
> A performance improvement is to take advantage of the "select from final table" feature in DB2 to combine the insert and select statement into a single SQL statement as shown below:
> SELECT id FROM FINAL TABLE (INSERT INTO EntityA (col1, col2, col3, version) VALUES (?, ?, ?, ?) )

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